Browse Physics

A new plasmonic route to long-distance entanglement is proposed.

By relaxing certain assumptions, it is possible to describe quantum correlations as both local and real.

Elastic scattering may be a larger source of qubit error than previously thought.

A new optical component for integrated photonic circuits could prove helpful for applications that store and transmit the information contained in linearly polarized light.

Dopant impurities may adversely affect the coherence of quantum bits in even highly purified silicon wafers.

Spins in a graphene quantum dot display properties surprisingly similar to those in semiconductor dots, but with potential for longer coherence times.

A new approach proves that a quantum random walk is faster than the classical version at finding marked points on a graph.

A proposal for low-energy quantum computing lets an atom in a cavity do the work of entangling consecutive photons.

Nuclear spins may enable enhanced control of electron spins in quantum information devices.

Multiplayer quantum games reveal a class of nonlocal correlations stronger than in either purely quantum or purely classical scenarios.

If the mechanism that allows birds to navigate is chemical in nature, the tools of quantum information might be in the driver’s seat.

Signal amplification in an optical interferometer may push the sensitivity of measurements beyond the standard quantum limit.

Short and long photon lifetimes have been custom engineered in a resonant microwave cavity.

A method called quantum smoothing has been experimentally shown to provide a mean-square measurement error that is a factor of 2 smaller than the quantum limit.

An NMR-based quantum computer can simulate a hydrogen molecule and accurately yield its ground-state energy.

The demonstration of entanglement between two neutral atoms would be a key step toward using them for quantum computation.

The mere possibility of a quantum transmission, rather than its actual occurrence, may enable key distribution in quantum cryptography.

Ion traps can store quantum information with long coherence times and support universal quantum computations.

A proposal for how to design a superconducting qubit solves the problem of decoherence caused by randomly charged impurities.

Whether two quantum states can be distinguished over time provides a test to characterize noise from the environment.