Wednesday, November 6, 2013

It's Election Night for NJ, VA governor races


Republican New Jersey Gov. Chris Christie looked for a big re-election victory Tuesday night amid talk of a 2016 presidential run, and Democrats battled for a sweep of top offices in Virginia that would put Terry McAuliffe in the governor's mansion. New Yorkers chose a new mayor for the first time in a dozen years.

In other, widely scattered odd-year balloting, Colorado was setting a tax rate for marijuana, Houston was deciding the fate of the Astrodome and Alabama Republicans were choosing between two of their own — from different wings of the party — in a special congressional runoff election in a conservative state.

Across the country, voters also were choosing sides in a host of local elections and ballot initiatives. Turnout was expected to be relatively light — even in the most hard-fought races — given that it was not a presidential or congressional election year, and voters were primarily hard-core partisans.

Not on the ballot, President Barack Obama took a pass on wagering any guess on outcomes, saying: "Never predict elections. That's a losing proposition."

Taken together, the results in individual states and cities were expected to yield no broad judgments on how the American public feels about today's two biggest national political debates — government spending and health care — which are more likely to shape next fall's midterm elections.

Even so, Tuesday's voting had local impact, and it mattered in ways big and small.

In Virginia, Democrats pushed to control all major statewide offices for the first time since 1970, a rejection of the conservatism that has dominated for the past four years. But Republicans were expected to hold the Legislature.

The state's two U.S. senators already are Democrats, and McAuliffe was favored to win the governorship, a one-term limited office, four years after voters elected conservative Republican Bob McDonnell. Both Bill and Hillary Rodham Clinton made appearances for McAuliffe in the final weeks, and so did Obama over the weekend.

Republican state Attorney General Ken Cuccinnelli was hoping for a late-game rally that would prove that a tea party-backed conservative could win the governorship of a swing-voting state. He brought big-name supporters to the state, too, including Sen. Marco Rubio of Florida, Sen. Rand Paul of Kentucky and Louisiana Gov. Bobby Jindal — all potential presidential contenders.

After being competitive for months, the race turned McAuliffe's way last month partly because of the partial government shutdown; the Democrat effectively used it to link Cuccinnelli to House Republicans in Washington and the tea party. Preliminary results of an exit poll conducted for The Associated Press and the television networks found that about a third of Virginia voters said they were personally impacted by the shutdown, and nearly half said Republicans deserved the blame for it.

Democrats also were expected to win the lieutenant governorship, and had a strong shot at the attorney general's office. They also could break through Republicans' veto-proof majority in the state House, and all that could set the stage of a presidential battleground ahead of the next White House race.

In New Jersey, Republican Gov. Christie was relishing the possibility of a big victory with support from across the political spectrum that would send a message to the GOP that a Republican with an inclusive message could win in Democratic territory.

In that sense, his expected win had implications for the 2016 presidential race.

A big victory could show his ability to draw support from Democrats, independents and minorities. This would be much as George W. Bush did in his re-election race as governor in Texas in 1998 — positioned to argue that he was the most electable in what might well be a crowded presidential primary field.

Later this month, Christie assumes the chairmanship of the Republican Governors Association, giving him another platform for a possible national campaign.

A Christie victory would make him the only Republican governor considering the presidency and serving with a Democratic Legislature, and he could use that to argue for pragmatism over ideology as a divided GOP seeks a path forward. He was opposed for re-election by state Sen. Barbara Buono.

Preliminary results of an exit poll in New Jersey suggest about that about half of New Jersey voters think Christie would make a good president, yet he would lag behind Hillary Clinton in a hypothetical 2016 matchup.

Elsewhere on Tuesday, the party's internal squabbles played out in the special congressional runoff primary election in Alabama. It featured veteran politician Bradley Byrne, the choice of the GOP establishment, against tea party favorite Dean Young.

The race was the first test of the U.S. Chamber of Commerce's promise to try to influence primaries. The group has pumped at least $200,000 into supporting Byrne, who has almost two decades in politics. Young argues that the Chamber endorsement is evidence that Byrne is the choice of big Washington interests.

Other races to watch:

—Big city mayors: In New York, Democrat Bill de Blasio was expected to cruise to victory over Republican Joe Lhota after Michael Bloomberg's dozen-year tenure. Atlanta, Boston, Detroit, Minneapolis, Seattle and other cities also chose mayors.

—Washington state: Voters weighed in on a ballot issue over mandatory labeling of genetically modified food, a contest that has drawn hefty financial contributions in opposition from the likes of PepsiCo., Monsanto and General Mills, which last year spent $46 million to defeat a similar measure in California.

—Colorado: Colorado voters determined whether to tax marijuana at 25 percent and apply the proceeds to regulating the newly legalized drug and building schools. Voters in 11 rural counties were asked if they wanted to approve secession from the state. One county was talking about joining Wyoming.

___

Associated Press writers Bill Barrow and Christina Almeida Cassidy in Georgia, Kristen Wyatt in Colorado, Chris Grygiel in Washington state, Corey Williams in Michigan and Nedra Pickler in Washington contributed to this report.

Source: http://news.yahoo.com/election-night-nj-va-governor-races-213546823--election.html
Tags: Alicia Ann Lynch   melissa mccarthy   Heartbreaker Justin Bieber   sofia vergara   george strait  

Tom Cruise: I Never "Abandoned" Suri, We're "Extremely Close," He Says in Lawsuit


Say what you want about Tom Cruise, but don't say he's a bad dad. The Oblivion actor, 51, has just filed new documents in his $50 million lawsuit against Bauer publishing, in which he refutes the company's 2012 cover stories claiming that he "abandoned" his 7-year-old daughter, Suri, after divorcing Katie Holmes in June 2012.


PHOTOS: Tom and Suri's cutest moments


"I have in no way cut Suri out of my life -- whether physically, emotionally, financially, or otherwise," the Jack Reacher star says in the documents (per TMZ).


Cruise -- who also has two kids, Conor and Isabella, with ex-wife Nicole Kidman -- goes on to claim that he and his little girl have maintained a very good relationship since the split. According to TMZ, he states in the docs: "...even during the times when I was working overseas and was not able to see Suri in person, we were (and continue to be) extremely close."


PHOTOS: Suri's fabulous life


The actor reportedly admits he's been busy in the year since his divorce from Holmes -- he filmed both Oblivion and Edge of Tomorrow -- but says he made a conscious effort to be there for his youngest child. "As my numerous emails with Suri's mother during this time period demonstrate, I was a constant presence in Suri's life," TMZ quotes the documents as saying.


PHOTOS: How Katie changed during her marriage to Tom


"While I'm sure my daughter misses me when I am not with her (as I miss her)," his statement continues, "she is a very happy child, and we have a wonderful relationship and cheerful phone calls."


Source: http://www.usmagazine.com/celebrity-news/news/tom-cruise-i-never-abandoned-suri-were-extremely-close-he-says-in-lawsuit-2013611
Category: houston texans   Allison Micheletti   danity kane   Raz B   elvis presley  

Sebelius: Couple of hundred website fixes required

FILE - In this Oct. 30, 2013 file photo, Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington. Sebelius is returning to Capitol Hill for a fresh interrogation on the health care law, this time from senators with growing concerns about President Barack Obama's crowning legislative achievement. Sebelius was due to face questions Wednesday from the Senate Finance Committee. (AP Photo/ Evan Vucci, File)







FILE - In this Oct. 30, 2013 file photo, Health and Human Services Secretary Kathleen Sebelius testifies on Capitol Hill in Washington. Sebelius is returning to Capitol Hill for a fresh interrogation on the health care law, this time from senators with growing concerns about President Barack Obama's crowning legislative achievement. Sebelius was due to face questions Wednesday from the Senate Finance Committee. (AP Photo/ Evan Vucci, File)







File-This April 17, 2013 file photo Senate Finance Committee Chairman Sen. Max Baucus, D-Mont. questions Health and Human Services Secretary Kathleen Sebelius as she testifies on Capitol Hill before the committee's hearing on President Barack Obama's budget proposal for fiscal year 2014. After warning months ago that a “train wreck” was coming in implementing the nation’s new health care law, Baucus now says he thinks the rollout can get back on track after a bumbling beginning. (AP Photo/J. Scott Applewhite,File)







(AP) — Prodded to be more candid with Congress, Health and Human Services Secretary Kathleen Sebelius said Wednesday the administration's health care website needed a couple of hundred fixes when it went online more than a month ago and conceded, "we're not there yet" in making all needed repairs.

At the same time, she turned aside any suggestion that the system be taken off line until it could be fixed fully. Doing so "wouldn't delay people's cancer or diabetes or Parkinson's" disease, she told the Senate Finance Committee.

Sen. Max Baucus, D-Mont., and the panel's chairman, said Sebelius must be "candidly, fully totally" forthcoming with Congress about the repair effort, "so that we don't wake up at the end of November and find out we're not there yet." He referred to the administration's goal for completing the repairs.

Sen. Orrin Hatch, R-Utah, the panel's senior republican, was harsher.

"While I am glad that you are accepting responsibility for this disastrous rollout, I would have preferred that you and the rest of the administration were honest with us to begin with," he said.

"It is simply inexcusable that the members of this committee were not told earlier that these problems were occurring," Hatch said.

Sebelius acknowledged that using HealthCare.gov — the troubled website where millions of people are supposed to be able to purchase coverage — "has been frustrating for many Americans."

But she told the Senate Finance Committee that the site's problems are being steadily fixed and will operate smoothly for most people by the end of this month. And she said the insurance marketplaces that the law is setting up are resulting in lower rates, citing figures for some premiums that she said are 16 percent lower than estimates from the nonpartisan Congressional Budget Office and other data from Oregon, New York and elsewhere.

"The fact is that the Affordable Care Act delivered on the product: quality, affordable health insurance," she said.

To the chagrin of increasingly nervous Democrats, Republicans are also on the attack about the millions of Americans whose health insurers have told them their current policies are being canceled. Obama has said that people who liked their coverage would be able to keep it.

Sebelius testified a week ago to the Republican-run House Energy and Commerce Committee.

At that confrontational session, she apologized for the troubles dogging the website where uninsured Americans and those buying coverage privately are supposed to be able to purchase health insurance. The secretary, who numerous Republicans have said should resign, has promised the site would be fixed by the end of this month and says it is secure.

Insurers are sending cancellation notices to customers whose current policies lack enough coverage to meet the law's more demanding standards — at least 3.5 million Americans, according to an Associated Press survey of states.

The Obama administration has said people facing cancellations will be able to find better coverage from their current insurance company or on state or federal exchanges where competing policies are being offered.

Lawmakers of both parties have introduced rival bills that would let people retain their existing health insurance policies. But administration officials refused to state their views Tuesday on those proposals.

White House spokesman Jay Carney suggested the White House would resist letting insurance companies continue offering substandard plans, saying that would undermine the law's fundamental promise of better health care.

"We're focused on implementing the Affordable Care Act," Carney said, using the law's formal name.

Senate Majority Leader Harry Reid, D-Nev., kept his distance from a measure by Sen. Mary Landrieu, D-La., who faces re-election next year, that would force insurers to reinstate canceled policies.

"There are hundreds of bills introduced every week, and we have to sort through those that have opportunity to be voted on," Reid said.

On the defensive about the law, Democrats have started trying to refocus Americans on its benefits.

The law requires most Americans to have health coverage by the start of 2015 or face fines. Middle-class people who don't get health insurance at work will qualify for federal subsidies for the private coverage they buy. More lower-income people will qualify for Medicaid in states that have agreed to expand that federal-state health care program for the poor.

"The real train wreck is what people are experiencing every day because they can't afford care," Sen. Tom Harkin, D-Iowa, said Tuesday at a hearing of the Senate Committee on Health, Education, Labor and Pensions, which he chairs.

At that hearing, Marilyn Tavenner, who runs the agency most directly involved in implementing the health care law, said the website was being improved.

"We obviously underestimated demand," said Tavenner, who heads the Centers for Medicare and Medicaid Services. She added, "We obviously had more bugs than we realized."

___

AP Special Correspondent David Espo and AP reporters Ricardo Alonso-Zaldivar and Josh Lederman contributed to this report.

Associated PressSource: http://hosted2.ap.org/APDEFAULT/bbd825583c8542898e6fa7d440b9febc/Article_2013-11-06-Health%20Overhaul-Problems/id-8b3cbfbbf119496a821d8a3b763f0dfb
Category: ufc   amber alert  

Knock lets you unlock your Mac by knocking on your iPhone, but not really

Knock lets you unlock your Mac by knocking on your iPhone, but not really

Knock is a new app available for iPhone that supposedly lets you unlock your Mac by simply knocking on your iPhone. It achieves this through using low power Bluetooth LE. Even if the Knock app isn't open, it should still work as long as Knock is running in the background. Or not.

To get up and running with Knock, you purchase the iPhone app and then download the Knock for Mac app via the Knock site (link below). Theoretically, you should just have to pair the two together for Knock to work. I tried this with two different compatible Macs, an iMac and a MacBook Air which were both running OS X Mavericks. On the iMac, just just flat out didn't work. On the MacBook Air, it worked once before my MacBook Air went to sleep and wasn't able to wake back up. I had to hard restart it to get it to turn back on.

I personally wasn't impressed with Knock. Not only for the reason that it didn't work well, but simply because I don't think typing in a desktop password on a computer is that daunting of a task. The app is bound to get killed in the background or take a few seconds to connect anyways. In the time spent fiddling with it, I could already have my Mac unlocked.

Either way, if you happen to try it, let me know if you were any more successful in getting it to work.

More info: Knock


    






Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/8Nb8XU9VOO8/story01.htm
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Microsoft kills Skype third-party tools for the desktop



Mocking the battle cry of "Developers, developers, developers," Microsoft is shutting down the desktop programming interface for Skype, effective the end of this year. Microsoft made the decision to yank the desktop API back in July, informing developers of that decision back then. But the shutdown hit the mainstream fan over the weekend, when the following warning began appearing as users log in to Skype:



Skype says my application will stop working with Skype in December 2013, why is that?


We've been working hard to develop new technologies and make improvements that will benefit Skype users across all platforms, especially on mobile devices. These changes will significantly improve the call quality and speed of delivery of instant messages, while retaining excellent battery life of mobile devices.


As people are using Skype on more devices, we're also working hard to create a more familiar and consistent Skype experience across all major platforms.


The Desktop API was created in 2004 and it doesn't support mobile application development. We have, therefore, decided to retire the Desktop API in December 2013.



[Cough, cough] The Win32 API started in 1987. Yes, I know the Win32 API doesn't support mobile apps. Skype's popular on the desktop, eh? [/Cough, cough]


Microsoft bought Skype in May 2011. The company paid $8.5 billion but apparently didn't earmark enough additional funds to continue its API.


Most of the programs that use the Skype API fall into four categories. There are dozens of recording apps, including VodBurner, Evaer, and Super Tintin, which will need a massive overhaul, assuming they can find a way to adapt.


There are also messaging apps that hook into Skype, such as Trillian, Pidgin, Adium, Kopete/KDE, Miranda, IM+, and fring, which may or may not be able to communicate with the future Skype.


A raft of miscellaneous third-party applications, once encouraged by Skype but now shunned by Microsoft, have already gone out of business, including Yappernut, Ubicall, KishKish, and many more. Other third-party apps will have to adapt, if they can. The Skype App Directory doesn't exist any more.


Most important, if you spent real money on a Skype phone -- one that has Skype controls on the handset or headset -- those fancy buttons won't work after the end of the year. You'll be able to use the Skype phone just like a regular phone or headset -- and that's it. Yes, even if you have an official Skype Certified headset, it'll turn very dumb after the API goes away.


There's no comparable API available without moving to SharePoint, which is hardly a household name. The residual Skype URI API, according to i-Programmer, lets programmers "place a call or start a chat and that's about it... the idea that you can bring existing applications up-to-date is laughable... From a technological point of view it makes no sense, so you can only assume that there is a marketing angle or some other politics in play."


Want to fight this Microsoft decision? There's a petition at Change.org that urges Microsoft to come to its senses:



Millions of Skype users have come to rely on the third party utilities developed by Skype's developer partners for their everyday communications activities, especially small to medium businesses. This petition requests Skype to reconsider this decision until they can provide support for these developers to continue to offer their added funtionality, such as call recording, chat archiiving, chat translation, headset operation to the basic Skype calling experience.



I'm petitioner number 1,029. Call me Sancho Panza.


This story, "Microsoft kills Skype third-party tools for the desktop," was originally published at InfoWorld.com. Get the first word on what the important tech news really means with the InfoWorld Tech Watch blog. For the latest developments in business technology news, follow InfoWorld.com on Twitter.


Source: http://www.infoworld.com/t/application-development/microsoft-kills-skype-third-party-tools-the-desktop-230101?source=rss_applications
Related Topics: Derrick Thomas   nbc  

Circles and cycles: CMA Awards hard to predict

FILE - This Sept. 24, 2013, file photo shows singer Taylor Swift at the premiere of "Romeo and Juliet" in Los Angeles. Swift is performing her hit song “Red” with special guests Alison Krauss, Edgar Meyer, Eric Darken, Sam Bush and Vince Gill on Nov. 6, 2013, at the Country Music Association Awards in Nashville, Tenn. (Photo by Dan Steinberg/Invision/AP, File)







FILE - This Sept. 24, 2013, file photo shows singer Taylor Swift at the premiere of "Romeo and Juliet" in Los Angeles. Swift is performing her hit song “Red” with special guests Alison Krauss, Edgar Meyer, Eric Darken, Sam Bush and Vince Gill on Nov. 6, 2013, at the Country Music Association Awards in Nashville, Tenn. (Photo by Dan Steinberg/Invision/AP, File)







Luke Bryan performs during a tribute to songwriter Dean Dillon at the BMI Country Awards on Tuesday, Nov. 5, 2013, in Nashville, Tenn. (AP Photo/Mark Humphrey)







NASHVILLE, Tenn. (AP) — There's bro country and pop country. There's traditional country, acoustic country and, arriving just now, metal country. All these faces of the genre — and more — will be on display Wednesday night during the Country Music Association Awards.

This will make it tough for millions of viewers to guess what's coming next when the awards air live (8 p.m. EST) on ABC from the Bridgestone Arena in Nashville, Tenn.

The young women of country music, who include top nominee Taylor Swift, Miranda Lambert and Carrie Underwood, have dominated the awards show circuit for the past few years. Before that there was a run on the guys with the guitars. And there was the cowboy hat era.

"It's always gone in cycles, you know," said Keith Urban, who will perform the duet "We Were Us" with Miranda Lambert. "We haven't had bands for a long time. That might be the next thing. You've got guys, and girls, and bands and then hats and ball caps, and then girls' mid-riffs, we go through everything."

The 47th annual awards, hosted by Underwood and Brad Paisley, come at a time of transition in country music. Swift and newcomer Kacey Musgraves lead with six nominations each; Miranda Lambert has five. Swift is nominated for her third entertainer of the year award, the night's top honor, and Lambert has been the darling of the 6,000 CMA voters with seven trophies since 2010.

Swift's nominations also include album of the year and female vocalist. The 23-year-old pop star earned three nods for her "Highway Don't Care" collaboration with Tim McGraw and Urban, and she will be presented with the CMA's Pinnacle Award, presented to artists who take country music to a worldwide audience. Garth Brooks is the only previous winner; he won in 2005.

With smart songwriting, a progressive bent and a strong sense of self like country's other top women, Musgraves made an auspicious mainstream country debut this year with her album "Same Trailer Different Park." She's up for album, female vocalist, new artist and single of the year. And she scored two song of the year nominations for co-writing Lambert's hit "Mama's Broken Heart" and her own "Merry Go 'Round."

Lambert, who will be going for her fourth straight female vocalist win, is up for single of the year and shares three nominations with her Pistol Annies trio.

There's no safe money on the winners this year. But at some point voters will begin acknowledging the so-called bro country movement — typified by hunky dudes often wearing ball caps and tight pants. Platinum-tinged rising acts like Luke Bryan and Florida Georgia Line rule the radio with coolers full of cold ones and good vibes.

Meanwhile, veteran George Strait is going for his third entertainer of the year award as he retires from the road, and Bob Dylan is the co-writer on song-of-the-year nominee "Wagon Wheel" with Ketch Secor of Old Crow Medicine Show.

Voters could easily make an argument for any of the five entertainer of the year nominees. Strait is the sentimental choice. Swift's popularity has helped expand the boundaries and fan base of country music. Blake Shelton is a five-time nominee who only seems to get more popular. Jason Aldean is about due for the award as a major architect of country's modernization and a touring titan. And Bryan is arguably country's hottest star after winning the rival Academy of Country Music's entertainer trophy in April and putting out 2013's best-selling album in the genre.

All of the entertainer of the year nominees will perform with Strait, joining Alan Jackson to salute the late George Jones. The Zac Brown Band will be joined by Foo Fighter Dave Grohl, Hunter Hayes has invited Jason Mraz to perform during the three-hour show and most of country's biggest stars will take the stage.

The CMA also will pay tribute to Kenny Rogers.

___

Follow AP Entertainment for updates from the show: http://twitter.com/APEntertainment. Follow AP Music Writer Chris Talbott: http://twitter.com/Chris_Talbott.

___

Online:

http://cmaworld.com

Associated PressSource: http://hosted2.ap.org/APDEFAULT/4e67281c3f754d0696fbfdee0f3f1469/Article_2013-11-06-Music-CMA%20Awards/id-b855cda230d24928a86f7fcdf654476e
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NIST's new compact atomic clock design uses cold atoms to boost precision

NIST's new compact atomic clock design uses cold atoms to boost precision


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PUBLIC RELEASE DATE:

6-Nov-2013



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Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)






Physicists at the National Institute of Standards and Technology (NIST) have demonstrated a compact atomic clock design that relies on cold rubidium atoms instead of the usual hot atoms, a switch that promises improved precision and stability.


Described in a new paper,* the heart of the prototype clock (the vacuum chamber containing the atoms) is about the size of a coffee mug, 150 cubic centimeters, set in a small table of lasers and electronics. This is about 10 times larger than NIST's chip-scale atomic clock packagesfor now. But when miniaturized and improved, NIST's new clock design has the potential to be about the same size and 1,000 times more precise and stable than chip-scale atomic clocks over crucial timespans of a day or more.


By achieving this goal, the cold-atom clock could also match the performance of commercial cesium-beam atomic clocks, common laboratory instruments, but in a smaller package.


"We're trying to push ultraportable clocks to higher performance levels," NIST physicist Elizabeth Donley says. "The aim is to make a clock that does not even need calibration."


NIST pioneered the development of chip-sized atomic clocks in 2004.** Atomic clocks of similar design using atoms in a hot gas were commercialized a few years ago. For the past eight years this NIST research group has concentrated on a spin-off technology, chip-scale atomic magnetometers, but recently refocused on miniature atomic clock designs.


Chip-scale atomic clocks keep time well enough for many applications requiring timing synchronization over short periods, such as GPS receivers. But clock precision tends to drift over time spans beyond a few hours because the atoms are dispersed in high-pressure gases, which alter the atoms' resonant frequencythe clock tick ratedepending on temperature. The new cold-atom clock does not use these gases at all, thus eliminating this source of error. Improvements like this could extend the uses of small, low-power clocks to exacting applications such as synchronizing telecommunications networks.


NIST's cold-atom clock relies on about 1 million rubidium atoms held in a small glass vacuum chamber. The atoms are cooled with lasers and trapped with magnetic fields at very cold, microkelvin temperatures. Two near-infrared lasers excite the atoms symmetrically from above and below. Each laser generates two frequencies of light, which are tuned until the atoms oscillate between two energy states and stop absorbing light. This sets the clock ticking rate at a specific microwave frequency.


By aiming at the atoms from opposite directions simultaneously, the laser arrangement cancels a major source of measurement errorthe Doppler shift, or the change in the atoms' apparent resonant frequency as they interact and move with the laser light. The clock also has special quantum features unique to rubidium atoms that boost the signal contrast and make the detection of the clock ticks more precise.


NIST researchers are already working on the next version of the cold-atom clock. In addition to reducing its size, researchers expect to improve its performance by adding magnetic shielding and antireflection coating. The research is funded in part by the Defense Advanced Research Projects Agency.


###


*F.-X. Esnault, E. Blanshan, E.N. Ivanov, R.E. Scholten, J. Kitching and E.A. Donley. A cold-atom double-lambda CPT clock. Physical Review A 88, 042120. Published Oct. 31, 2013.

**See 2004 NIST news release, "NIST Unveils Chip-Scale Atomic Clock," at http://www.nist.gov/public_affairs/releases/miniclock.cfm. An early version of this clock recently went on display at the Smithsonian Institution "Time and Navigation" exhibit.




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NIST's new compact atomic clock design uses cold atoms to boost precision


[ Back to EurekAlert! ]

PUBLIC RELEASE DATE:

6-Nov-2013



[


| E-mail

]


Share Share

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)






Physicists at the National Institute of Standards and Technology (NIST) have demonstrated a compact atomic clock design that relies on cold rubidium atoms instead of the usual hot atoms, a switch that promises improved precision and stability.


Described in a new paper,* the heart of the prototype clock (the vacuum chamber containing the atoms) is about the size of a coffee mug, 150 cubic centimeters, set in a small table of lasers and electronics. This is about 10 times larger than NIST's chip-scale atomic clock packagesfor now. But when miniaturized and improved, NIST's new clock design has the potential to be about the same size and 1,000 times more precise and stable than chip-scale atomic clocks over crucial timespans of a day or more.


By achieving this goal, the cold-atom clock could also match the performance of commercial cesium-beam atomic clocks, common laboratory instruments, but in a smaller package.


"We're trying to push ultraportable clocks to higher performance levels," NIST physicist Elizabeth Donley says. "The aim is to make a clock that does not even need calibration."


NIST pioneered the development of chip-sized atomic clocks in 2004.** Atomic clocks of similar design using atoms in a hot gas were commercialized a few years ago. For the past eight years this NIST research group has concentrated on a spin-off technology, chip-scale atomic magnetometers, but recently refocused on miniature atomic clock designs.


Chip-scale atomic clocks keep time well enough for many applications requiring timing synchronization over short periods, such as GPS receivers. But clock precision tends to drift over time spans beyond a few hours because the atoms are dispersed in high-pressure gases, which alter the atoms' resonant frequencythe clock tick ratedepending on temperature. The new cold-atom clock does not use these gases at all, thus eliminating this source of error. Improvements like this could extend the uses of small, low-power clocks to exacting applications such as synchronizing telecommunications networks.


NIST's cold-atom clock relies on about 1 million rubidium atoms held in a small glass vacuum chamber. The atoms are cooled with lasers and trapped with magnetic fields at very cold, microkelvin temperatures. Two near-infrared lasers excite the atoms symmetrically from above and below. Each laser generates two frequencies of light, which are tuned until the atoms oscillate between two energy states and stop absorbing light. This sets the clock ticking rate at a specific microwave frequency.


By aiming at the atoms from opposite directions simultaneously, the laser arrangement cancels a major source of measurement errorthe Doppler shift, or the change in the atoms' apparent resonant frequency as they interact and move with the laser light. The clock also has special quantum features unique to rubidium atoms that boost the signal contrast and make the detection of the clock ticks more precise.


NIST researchers are already working on the next version of the cold-atom clock. In addition to reducing its size, researchers expect to improve its performance by adding magnetic shielding and antireflection coating. The research is funded in part by the Defense Advanced Research Projects Agency.


###


*F.-X. Esnault, E. Blanshan, E.N. Ivanov, R.E. Scholten, J. Kitching and E.A. Donley. A cold-atom double-lambda CPT clock. Physical Review A 88, 042120. Published Oct. 31, 2013.

**See 2004 NIST news release, "NIST Unveils Chip-Scale Atomic Clock," at http://www.nist.gov/public_affairs/releases/miniclock.cfm. An early version of this clock recently went on display at the Smithsonian Institution "Time and Navigation" exhibit.




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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.




Source: http://www.eurekalert.org/pub_releases/2013-11/nios-nnc110613.php
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