Browse Physics

David Wineland and Serge Haroche, who studied photons and atoms in new ways, have won the 2012 Nobel Prize in Physics.

Researchers measure the complex “shape” of individual photons, which could lead to new ways of encoding information.

The oscillations of a carbon nanotube can strongly affect the spin of an electron trapped on the tube, and the tube can also be affected by the spin, according to theory.

A semiconductor chip that generates entangled photon pairs is friendlier to integration with other chip-based quantum components than any previous device.

Researchers propose a way to transfer quantum information between ions and electronic circuits, opening up new options for quantum computation.

Time travel isn’t forbidden by physical laws. A new consistency condition for time traveling quantum states eliminates any possibility of so-called grandfather paradoxes, in which a time-traveler kills her own ancestor.

A theoretical paper suggests that quantum entanglement between macroscopic objects could be accomplished at temperatures much higher than previously thought.

The turbulent atmosphere is better than an equivalent glass fiber when it comes to preserving quantum information in long-distance light signals, according to a new analysis. For brief moments, light can propagate relatively undisturbed.

Quantum teleportation, a means of transferring the identity of one particle to another over some distance, made its debut in Physical Review Letters in 1993.

Researchers have measured the overlap time of an entangled pair of photons by treating them like ordinary laser pulses.

Real-world events always proceed in the direction of increasing entropy, even though the laws of physics don’t require it. The reason we never see events that reduce entropy is that they cannot leave behind any evidence of having happened, according to a new theory.

A miniature time machine, possibly based on a wormhole through spacetime, could be used to break a super-secure quantum code.

Researchers propose a new and less challenging way to “squeeze” light, strongly reducing quantum fluctuations to make a beam with unwavering intensity.

Moving at close to the speed of light may create entanglement in particles that seemingly had none while at rest.

A new technique allows sorting of single photons according to their orbital angular momentum–a property that could serve as an alphabet for optical messages.

The Universe may be described as a giant quantum computer, according to a researcher who calculates its total computing power.

Microscopic pinholes may soon allow the one-by-one transfer of photons in a way that mimics the process of Coulomb blockade of electrons.

Portfolio techniques borrowed from the world of finance could aid quantum computing.

A five qubit code might help quantum computers catch mistakes.

A specially prepared Bose-Einstein condensate would produce oppositely directed beams of entangled atoms, which could be used for investigations of entanglement and quantum information theory. In the past only beams of entangled photons have been produced.