Wednesday, April 1, 2015

Scientists Just Broke a Quantum Record By Entangling 3,000 Atoms

Quantum entanglement is an odd phenomenon that can connect two or more particles over even vast distances. Scientists have now managed to entangle not two, not 100 (the previous record), but 3,000 atoms with a single photon, opening the door to atomic clocks more accurate than ever.
In quantum entanglement, particles are correlated so that a change in one will instantaneously induce a change in others—even if they are at opposite ends of the universe. The classic example is a pair of entangled particles: If one changes its spin to clockwise, the other simultaneously flips to counterclockwise.

Entangling particles, especially large numbers of them, is no easy task. MIT and University of Belgrade scientists report in Nature that they managed to entangle 3,000 particles trapped in a supercooled cloud. The key was using very weak light, as weak as a single photon of light, which is less likely to disturb the cloud than a strong beam. The photon bounced thousands of times between two mirrors, passing back and forth through the cloud of atoms. This was enough to entangle the atoms, which LiveScience explains:

If a photon in a pulse interacted with the cloud’s atoms, the polarization of the photon would rotate slightly. Strangely, in the realm of quantum physics, the act of measurement can dramatically influence the object getting measured, and the act of detecting a photon that interacted with these atoms can essentially generate entanglement between those atoms.

So why does this matter? One possible application is quantum clocks—the more atoms are entangled, the more accurate the clock. This technique might even be used to get around the uncertainty of quantum measurements. (Physics World has a great technical explanation of how.) Atomic clocks are used to keep track of GPS systems.

This could also be a step toward complex entangled states that can give us quantum computing and quantum encryption. But it’s also just pretty damn cool to push the limits of what’s possible. [Nature, LiveScience, MIT]


  1. This blog is really helpful to pass on redesignd enlightening endeavors over web which is genuinely examination. I found one productive instance of this truth through this blog. CSIR Net Chemistry Books

  2. Fitbit selection of apps and watch faces also provides some insight as to why it purchased troubled smartwatch maker Pebble assets, which it announced it would acquire in late 2016. The variety of niche clock designs in Fitbit store is reminiscent of the styles Pebble developer community created for the company Kickstarter funded timepieces years ago. I only wish there was an easier way to filter these clock faces; Fitbit only sorts them by whether or not they heavy on statistics, whether they digital or analog, or whether they were created by Fitbit.

    That why their dropout rate Coach Outlet Clearance Sale is higher than Nike Air Force 1 Cheap Outlet that of women. There the factor of increased awareness. Changing environment encourages women to join Best Yeezys the workforce and acquire higher Coach Outlet Online education for well paid jobs. My kids weren there, I knew I probably would Cheap Michael Kors Handbags have tried to Jordan Shoes For Sale take the gun Ray Ban Outlet from her, Gray MK Outlet Online said, adding, my kids wouldn have been there, I probably would have put my hand on her. When Alexander defense attorney asked him what he meant by my hand on her, Gray replied, hit her. I got five baby mammas and I put my hands on every last one of them except for one..