Sand-grain-sized drum extends reach of quantum theory

The banging of a tiny drum heralds the intrusion of the weird world of quantum mechanics into our everyday experience. Though no bigger than a grain of sand, the drum is the largest object ever to have been caught obeying the uncertainty principle, a central idea in quantum theory.

As well as extending the observed reach of quantum theory, the finding could complicate the hunt for elusive gravitational waves : it suggests that the infinitesimal motion caused by these still-hypothetical ripples in spacetime could be overwhelmed by quantum effects.

The uncertainty principle says that you cannot simultaneously determine both a particle's exact position and momentum. For example, bouncing a photon off an electron will tell you where it is, but it will also change the electron's motion, creating fresh uncertainty in its speed.

This idea limits our ability to measure the properties of very small objects, such as electrons and atoms. The principle should also apply to everyday, macroscopic objects, but this has not been tested – for larger objects, the principle's effects tend to be swamped by other uncertainties in measurement, due to random noise, say.

Quantum drum

To extend the known reach of the uncertainty principle, Tom Purdy and colleagues of the University of Colorado, Boulder, created a drum by tightly stretching a 40-nanometre-thick sheet of silicon nitride over a square frame with sides of half a millimetre – about the width of a grain of sand. They placed the drum inside a vacuum chamber cooled to a few degrees above absolute zero, minimising any interference by random noise.

By continuously firing a stream of photons at the drum they were able to get increasingly precise measurements of the position of the skin at any moment. However, this also caused the skin to vibrate at an unknown speed. When they attempted to determine its momentum, the error in their measurement had increased – just as the uncertainty principle predicts.

"You don't usually have to think about quantum mechanics for objects you can hold in your hand," says Purdy.

That the uncertainty principle holds sway at such a large scale could affect the hunt for gravitational waves, which are predicted by Einstein's theory of general relativity but have never been detected.

Mitigation strategy

Gravitational wave detectors look for very slight changes in the distance between two test masses caused by passing spacetime ripples. Purdy says his team's experiment confirms long-held suspicions that quantum uncertainty could overwhelm these very small changes.

Now he and others can use the drum to explore more advanced measurement techniques to mitigate the effects. For example, uncertainty in an object's momentum could lead to future uncertainty in its position and there should be ways to minimise such knock-on effects. "You can't avoid the uncertainty principle, but you can in some clever ways make it [such that] increasing the momentum doesn't add back to the uncertainty in position at a later time," says Purdy.

His experiment is a neat demonstration of the breakdown of the traditional notion that the atomic world is quantum while the macroscopic world is classic, says Gerard Milburn of the University of Queensland in Brisbane, Australia, who was not involved in the work. Previous, attempts to blur the quantum-classical divide have involved entangling diamonds and demonstrating quantum superposition in a strip of metal.

Despite these feats, Milburn doesn't rule out the prospect of a breakdown on really large scales. "Of course maybe one day we will see quantum mechanics fail at some scale. Testing it to destruction is a good motivation for going down this path," he says.

Journal reference: Science, DOI: 10.1126/science.1231282

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S. Korea leader says only regime fall will change North

SEOUL: North Korea can never be made to abandon its nuclear weapons programme, South Korean President Lee Myung-Bak said Friday, arguing that only regime collapse could remove the threat from Pyongyang.

As the UN Security Council continues to debate how to punish the North for its latest nuclear test, the outgoing president suggested the best way forward was to try to foment unrest among the North Korean people.

"It has become impossible to have North Korea give up its nuclear weapons through dialogue and negotiations", Lee told a meeting of senior dignitaries including former government ministers and religious leaders.

"We cannot hope the North will part with its nuclear programmes until its regime changes or collapses", he said.

"We can help change the North Korean people, if not the North Korean regime itself."

Lee is set to leave office in 10 days at the end of a five-year term marked by an almost complete breakdown in contacts between Seoul and Pyongyang.

Lee had always promised to take a harder line than his predecessors, making continued aid to the impoverished North conditional on progress in talks on its nuclear programme.

His successor, president-elect Park Geun-Hye, campaigned on a policy of greater engagement with Pyongyang, but Tuesday's nuclear test will almost certainly see that policy shelved for months, if not longer.

-AFP/fl

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Mom of boy held in bunker is worried

STORY HIGHLIGHTS

• Phil McGraw speaks with mother of former Alabama child hostage


• She tells him she worried about trying to put him back on a school bus


• Ethan told her the Army killed the 'bad man'


• The 6-year-old tells his mom that 'My bus driver is dead'

(CNN) -- Jennifer Kirkland says she caught her 6-year-old son Ethan just staring at a school bus the other day.

He was mesmerized, his eyes locked on the yellow vehicle. He didn't say a thing, and she didn't know what to say to him.

The last time he was on a bus, he was sitting just behind the driver -- as he always did -- waiting for his stop so he could go home.

But the "bad man" got on, and killed the driver, his buddy Mr. Poland.

Appearing on the "Dr. Phil" show, Kirkland told Phil McGraw she was worried how her little boy was going to react the next time she tried to put him on the bus to school.

After being kidnapped, the recovery ahead

Photos: Alabama bunker standoff

HIDE CAPTION

Ethan has been having a hard time sleeping, she told the psychologist turned syndicated daytime talk show host.

He thrashes his arms, tosses and turns and sometimes he calls out.

It has only been almost 10 days since the FBI sent a rescue team into the bunker in Midland City, Alabama, where Ethan was held hostage for nearly a week by Jimmy Lee Dykes.

His mother hasn't asked Ethan what happened when he was there.

"I have not talked to Ethan about it," she said in an interview aired Wednesday. "I don't know how to. As a mother I want him to know that I'm there if he needs to talk. I don't know how to respond because I have never been through this."

Inside the bunker: From storm shelter to boy's prison

Ethan has seen two people shot to death. Dykes shot bus driver Charles Poland several times before he carried Ethan, who had fainted, off the bus and into an underground bunker Dykes had built on his property.

Then the FBI killed Dykes when negotiations broke down and authorities felt they had to rescue the boy before Dykes, who had a handgun, did something rash.

"The Army came in and shot the bad man," Kirkland said Ethan told her.

Kirkland said she had hoped Dykes wouldn't be harmed.

"From the very beginning, I had already forgiven Mr. Dykes even though he had my child," she said. "I could not be angry through this. My job was to be the mother."

She thinks Dykes had a soft spot for Ethan because he has disabilities. Dykes took care of her boy as best he could, she said.

He even fried chicken for the boy.

Still, as the crisis continued, she worried that Dykes might be spooked by something her child did -- or that he had enough supplies to stay down there for months. She worried her boy would think she had abandoned him.

She asked authorities to let her speak to Dykes.

"That's my baby. He's my world. He's my everything," she said. "Everything I do I do for him. And I was afraid I wasn't going to get him back."

When she did get him back, he was in the hospital, putting stickers on everyone in sight.

"Hey, bug, I sure have missed you," she recounted.

"I missed you, too," he answered.

FBI: Bombs found in Alabama kidnapper's bunker

Now she worries that even though he seems like the same playful little boy, there is an emotional storm ahead.

McGraw told her to talk to Ethan about his feelings, not what happened to him in the bunker.

"Let that decay in his young mind," he said.

McGraw asked Ethan a few questions, but as 6-year-olds are apt to do, he answered most with a "Yes" or a "No."

But when the doctor asked him how he got to school, Ethan said, "On my bus, but my ..."

Then he walked over to his mother and as if telling a secret, whispered in her ear, "But my bus driver is dead."

Kirkland told McGraw that it was Poland who helped Ethan conquer his fear of descending the steep school bus steps. Poland would cheer Ethan on and one day when the child hesitated and the mother went to help, the driver said, "Let him do it."

Since then, Ethan has had no problem.

But now his cheerleader won't be there, and Kirkland is anguished about her boy.

"Mr. Poland put him behind him so he could keep a good eye on him," she said.

Ethan hasn't been back to school yet. He's been busy opening birthday presents and playing with his favorite toys. On Wednesday, he made a new friend in Gov. Robert Bentley.

There's a picture from the event where little Ethan is sitting underneath the governor's desk. The child is beaming.

"Ethan is a loving, forgiving child," Kirkland said. "He is easy to go up to a perfect stranger and say, 'Can I have a hug?'"

That was the boy who went into that bunker. She is concerned it's not the child who came out.

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Cruise passenger: People thought ship was "going to tip over"

(CBS News) Four thousand people who have been adrift at sea for four days are finally nearing shore Thursday night. This evening, the Carnival cruise ship named Triumph is being towed into Mobile Bay, Ala., and is expected to dock by midnight.

She left Galveston, Texas, a week ago, loaded with her maximum 3,143 passengers and crew of 1,100. The brochure described a four-day cruise in the Caribbean, but an engine room fire left her adrift and powerless.

All aboard have suffered in squalid conditions, stranded as Carnival slowly brought the ship in.

When CBS News flew over the Carnival Triumph, it was within sight of shore -- but still seven hours away from the dock.

Cruise ship on the move after latest setback
Carnival cancels 12 more cruises on troubled ship
Inside Carnival cruise nightmare: Passenger describes deteriorating conditions

From up there we could see people waving, some with signs that appear to be made out of bed sheets. One said "SOS" -- save our ship -- but at this point it's not the ship that needs saving, it's the passengers.

The ship has been without power since an engine room fire five days ago. CBS News reached passenger Jacob Combs on the phone.

"The really bad part is there was no running water and toilets for almost the first 30 hours," Combs said. "Once they finally did get running water, the toilets only worked in certain places. I would say it's the worst smell imaginable."

Emailed photos (above) reveal squalid conditions. Many passengers used red plastic bags as toilets. Hundreds slept in hallways or topside to escape the foul and stagnate air below deck.

Carnival CEO Jerry Cahill insists passengers were never at risk. But 22-year old Leslie Mayberry disagreed.

"It was leaning to one side it was literally like walking up hill whenever the boat was leaning," she said. "I mean it was very scary," Mayberry said. "I mean a lot of people thought it was going to tip over and sink. And then you look out on the deck and you see the ocean and there is no one, you are just by yourself and you are so alone, even though you are around 3,000 other people on this boat."

The towline pulling the 14-story tall ship snapped, delaying Thursday's operation. It was re-attached, but it will be nightfall before the ship arrives at the terminal. Nellie Betts came from Tupelo, Miss., to meet her daughter.

"There's no reason why those people should be out there as long as they have. Why? I want to understand why," she said. "What is taking them so long to get them out?"

Once the ship arrives at the terminal, Carnival plans to put most of those passengers on a two-hour bus rid to New Orleans or even to Galveston, Texas, but some already are saying, "no thanks" - they have relatives picking them up in Mobile so they can go straight home.

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Nightmare Ends: Passengers Leave Disabled Ship

After five days without power in the Gulf of Mexico, the Carnival Triumph cruise ship carrying more than 4,000 people arrived in Mobile, Ala., to greet a cheering crowd of friends and family members waiting to embrace their loved ones.

Passengers began to disembark the damaged ship around 10:15 p.m. CT Thursday and continued into the overnight hours. Other waiting passengers lined the decks of the ship, waving, and whistling to those on shore. "Happy V-Day" read a homemade sign made for the Valentine's Day arrival and another, more starkly: "The ship's afloat, so is the sewage."

Some still aboard chanted, "Let me off, let me off!" and "Sweet Home Alabama."

The Carnival Triumph departed Galveston, Texas, last Thursday and lost power Sunday after a fire in the engine room disabled the vessel's propulsion system and knocked out most of its power.

After power went out, passengers texted ABC News that sewage was seeping down the walls from burst plumbing pipes, carpets were wet with urine, and food was in short supply. Reports surfaced of elderly passengers running out of critical heart medicine and others on board squabbling over scarce food.

Click Here for Photos of the Stranded Ship at Sea

Passengers said many of the cabins became intolerable with the smell of raw sewage. They were forced to create makeshift beds out of lounge chairs on the ship's deck.

AP Photo/John David Mercer

Girl Disembarks Cruise Ship, Kisses the Ground Watch Video

Carnival CEO Gerry Cahill: 'I Want to Apologize' Watch Video

Carnival Cruise Ship Passengers Line Up for Food Watch Video

"We kind of camped out by our lifeboat. We would have nightmares about Titanic basically happening," passenger Kendall Jenkins told ABC News Radio after disembarking from the ship.

"I am just so blessed to be back home," she added.

Jenkins was one of many passengers that were photographed kissing the ground when they exited the ship.

WATCH: Carnival CEO Gerry Cahill Apologizes to Passengers

Approximately 100 buses were waiting to take passengers on the next stage of their journey. Passengers have the option to take a bus ride to New Orleans or Galveston, Texas, where the ill-fated ship's voyage began. From there, passengers will take flights home, which Carnival said they would pay for.

Inside the buses, Carnival handed out bags of food that included French fries, chicken nuggets, honey mustard barbecue sauce and apples.

Deborah Knight, 56, decided to stay in Mobile after the arduous journey was over rather than board a bus for a long ride. Her husband Seth drove in from Houston and they checked in at a downtown Mobile hotel.

"I want a hot shower and a daggum Whataburger," said Knight.

She said she was afraid to eat the food on board and had gotten sick while on the ship.

Cruise Ship Newlyweds Won't Be Spending Honeymoon on a Boat

For 24-year-old Brittany Ferguson of Texas, not knowing how long passengers had to endure their time aboard was the worst part.

"I'm feeling awesome just to see land and buildings," Ferguson said, who was in a white robe given to her aboard. "The scariest part was just not knowing when we'd get back," she told The Associated Press.

Carnival president and CEO Gerry Cahill praised the ship's crew and told reporters that he was headed on board to apologize directly to its passengers shortly before the Carnival Triumph arrived in Mobile.

"I know the conditions on board were very poor," Cahill said Thursday night. "I know it was very difficult, and I want to apologize again for subjecting our guests for that. ... Clearly, we failed in this particular case."

Luckily no one was hurt in the fire they triggered the power outage, but many passengers aboard the 900 foot colossus said they smelled smoke and were living in fear.

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Horsemeat scandal should make us rethink how we eat

Forget food taboos and veterinary drugs, what really matters here is how we produce meat – and what meat we're prepared to eat

HOW would you feel if the food on your plate had been adulterated with a cheap ingredient and passed off as something it was not? Probably quite angry, and perhaps a little queasy.

That might sound like an obvious reference to the horsemeat scandal that has engulfed Europe over the past few weeks , but it need not be. We could just as easily be talking about basmati rice, which is routinely bulked out with inferior varieties.

The problem of food fraud has not just galloped out of nowhere. Past cases have generally been associated with high-end products – honey, olive oil, cheese, fish, coffee, even posh potatoes. But the fact that the lucrative trade in adulteration also infests the bottom end of the market should come as no surprise. It has probably been going on for years.

So why the scandal over this case? There was no such outcry over basmati rice, even though the crime would appear to be roughly equivalent.

One factor is clearly cultural taboos over horsemeat. A more important one, though, is surely disgust and guilt at how the human food chain operates to satisfy our collective appetite for cheap meat. Why else would flesh from a Romanian abattoir find its way – via Cyprus, the Netherlands, France and Luxembourg – into cheap processed dinners in the UK? That is the real scandal here.

Meat is already a guilty pleasure for many, not just because of animal rights issues but also its environmental impact. That is not an argument for universal vegetarianism, which is no panacea (New Scientist, 17 July 2010, p 28). But the scandal is an opportunity to recalibrate our relationship with meat, starting with stricter regulation and monitoring and ending with better consumer choices. Eating less, eating ethically and eating locally would all benefit personal heath, the environment, animal welfare and the economy.

And while we're at it, why not rethink those taboos? Horsemeat is perfectly edible, so why let it go to waste? And what about algae, jellyfish, invasive species or insects? All are surely more palatable than a factory-produced meal of any description – let alone one that is a step away from the knacker's yard.

This article appeared in print under the headline "Who ordered that?"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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Ex-CNB chief found not guilty of corruption

SINGAPORE: Former Central Narcotics Bureau (CNB) chief Ng Boon Gay is not guilty of corruption in a high-profile sex-for-contracts trial.

The verdict was handed down by District Judge Siva Shanmugam on Thursday afternoon.

The judge said there was no corrupt element involved, and found Cecilia Sue's credibility to be successfully impeached.

He said her explanations on inconsistencies in her statements to the Corrupt Practices Investigation Bureau (CPIB) and evidence in court were inadequate and unconvincing.

The judge also found Ng's evidence to be consistent and credible.

Ng, 46, was charged in June last year with four counts of obtaining sexual favours from Ms Sue, who was a sales manager for two IT vendors.

Ng allegedly breached the Prevention of Corruption Act by engaging in sexual acts with Ms Sue on four occasions, between June and December in 2011.

Ms Sue, 36, was the sales manager of Hitachi Data Systems from June to November 2011.

She joined Oracle Corporation Singapore in December in 2011 as its senior sales manager.

In exchange, Ng was accused of furthering the business interests of the two IT companies in their dealings with CNB.

After a closely-watched 14-day trial, both the prosecution and defence made their closing arguments on 28 January 2013.

- CNA/xq

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Woman found killed in home of 'blade runner' Pistorius

By Nkepile Mabuse, CNN

updated 2:47 AM EST, Thu February 14, 2013

STORY HIGHLIGHTS

• The shooting occurred in the home of Oscar Pistorius


• South African police say man, 26, was taken into custody


• Pistorius is a double-amputee who ran with the aid of prosthetic limbs

Pretoria, South Africa (CNN) -- A woman was found shot and killed in the Pretoria home belonging to South African Olympian Oscar Pistorius, nicknamed the "Blade Runner," South African police said Thursday.

Brig. Denice Beukes said they have arrested a 26-year-old man in connection with the shooting and that he will appear in Pretoria magistrate court sometime Thursday.

Pistorius, who is 26, was cooperating with police.

A spokeswoman for Pistorius declined to comment on the report when CNN reached her by phone.

A neighbor in the residential community alerted police to the shooting, Beukes said. When a CNN crew arrived, it saw a mortician's van leaving the house.

Pistorius is a double-amputee who ran with the aid of prosthetic limbs during the London Olympics last year. His debut made him the first Paralympian to compete in the able bodied Olympics.

The runner's legs were amputated below the knee when he was a toddler because of a bone defect. He runs on special carbon fiber blades, hence the nickname.

While he failed to win a medal in the Olympics, his presence on the track was lauded as an example of victory over adversity and a lesson in dedication to a goal.

Pistorius was initially refused permission to compete against able-bodied competitors, but he hired a legal team to prove that his artificial limbs didn't give him an unfair advantage.

He smashed a Paralympic record to win the men's 400m T44 in the final athletics event of the 2012 Games.

The athlete was named one of People magazine's Sexiest Man Alive last year.

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Couple: "Calm" Dorner tied us up in our condo

LOS ANGELES A California couple says fugitive ex-police officer Christopher Dorner tied them up in their mountain condominium and stole their car before the firefight that led to his presumed death.

Karen and Jim Reynolds said at a news conference Wednesday that they came upon Dorner when they entered the condo in Big Bear, Calif. Tuesday, and believe he'd been there as early as Friday.

They say Dorner had a gun but said he wouldn't hurt them.

Play Video

SoCal breathing easier after deadly standoff

CBS Los Angeles station KCBS-TV reports Karen said, "He talked to us. Tried to calm us down. And saying very frequently he would not kill us."

"He was very calm and very methodical," said Karen.

Authorities couldn't immediately verify their story, but it matched early reports from law enforcement officials. Later reports said the incident involved two women from a cleaning crew.

18 Photos

Ex-LAPD cop accused of going on killing spree

The Reynolds said they went to the cabin noon to clean it for rental purposes, and that's when they -- and not two cleaning ladies as had been reported - met up with Dorner, KCBS says.

The Reynolds say he tied their arms and put pillowcases over their heads before fleeing in their Nissan.

Karen Reynolds managed to get to her cell phone and dial 911.

The couple, who said Dorner had his gun drawn the entire time, said they were with the suspect for 15 minutes, KCBS adds. "It felt like a lot longer," said Karen. "I really thought that it was the end."

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Dorner Not IDed, But Manhunt Considered Over

Though they have not yet identified burned remains found at the scene of Tuesday's fiery, armed standoff, San Bernardino, Calif., officials consider the manhunt over for Christopher Dorner, the fugitive ex-cop accused of going on a killing spree.

"The events that occurred yesterday in the Big Bear area brought to close an extensive manhunt," San Bernardino County Sheriff John McMahon told reporters this evening.

"I cannot absolutely, positively confirm it was him," he added.

However, he noted the physical description of the suspect authorities pursued to a cabin at the standoff scene, as well as the suspect's behavior during the chase and standoff, matched Dorner, 33.

The charred remains of the body believed to be Dorner were removed from the cabin high in the San Bernardino Mountains near Big Bear, Calif., the apparent site of Dorner's last stand. Cornered inside the mountain cabin Tuesday, the suspect shot at cops, killing one deputy and wounding another, before the building was consumed by flames.

"We did not intentionally burn down that cabin to get Mr. Dorner out," McMahon said tonight, though he noted pyrotechnic canisters known as "burners" were fired into the cabin during a tear gas assault in an effort to flush out Dorner. The canisters generate high temperatures, he added.

The deputies wounded in the firefight were airlifted to a nearby hospital, where one died, police said.

Christopher Dorner Believed Dead After Shootout with Police Watch Video

Carjacking Victim Says Christopher Dorner Was Dressed for Damage Watch Video

Christopher Dorner Manhunt: Inside the Shootout Watch Video

The deceased deputy was identified tonight as Det. Jeremiah MacKay, 35, a 15-year veteran and the father of two children -- a daughter, 7, and son, 4 months old.

"Our department is grieving from this event," McMahon said. "It is a terrible deal for all of us."

The Associated Press quoted MacKay on the Dorner dragnet Tuesday, noting that he had been on patrol since 5 a.m. Saturday.

"This one you just never know if the guy's going to pop out, or where he's going to pop out," MacKay said. "We're hoping this comes to a close without more casualties. The best thing would be for him to give up."

The wounded deputy, identified as Alex Collins, was undergoing multiple surgeries for his wounds at a hospital, McMahon said, but was expected to make a full recovery.

Before the final standoff, Dorner was apparently holed up in a snow-covered cabin in the California mountains just steps from where police had set up a command post and held press conferences during a five-day manhunt.

The manhunt for Dorner, one of the biggest in recent memory, led police to follow clues across the West and into Mexico, but it ended just miles from where Dorner's trail went cold last week.

Residents of the area were relieved today that after a week of heightened police presence and fear that Dorner was likely dead.

"I'm glad no one else can get hurt and they caught him. I'm happy they caught the bad guy," said Ashley King, a waitress in the nearby town of Angelus Oaks, Calif.

Hundreds of cops scoured the mountains near Big Bear, a resort area in Southern California, since last Thursday using bloodhounds and thermal-imaging technology mounted to helicopters, in the search for Dorner. The former police officer and Navy marksman was suspected to be the person who killed a cop and cop's daughter and issued a "manifesto" declaring he was bent on revenge and pledging to kill dozens of LAPD cops and their family members.

But it now appears that Dorner never left the area, and may have hid out in an unoccupied cabin just steps from where cops had set up a command center.

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