Browse Physics

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

A quantum algorithm that uses the solution to a set of linear equations provides an exponential speedup by comparison with classical alternatives.

The demonstration of all-optical spin-echo measurements may provide a route toward decoupling spins from noise sources.

A system familiar in condensed matter—particles on a hexagonal lattice—could be a useful initial state for a one-way quantum computer.

A rigorous estimate shows that an error correction code for a scalable quantum computer can accommodate error at the 0.1% level—about ten times more tolerant than most other methods.

Squeezed states can enhance the sensitivity of a detector and the storage capability of quantum memory devices. Because these features improve with an increase in system size, researchers are exploring ways to produce squeezed states in large ensembles of atoms.

Spin decoherence is a fundamental obstacle in quantum computation and spintronics. Scientists show they can increase the lifetime of a localized spin in a diamond lattice up to 100 times by polarizing the surrounding spins on the lattice.