Browse Physics

A calculation performed with four photon qubits proves that a promising quantum algorithm works.

Transitions in an atom can allow nondestructive measurement of the quantum vacuum state.

Laser light scattered from a single atom undergoes large optical phase shifts that may be useful in imaging and quantum information transmission.

Quantum information lost after a measurement can be recovered using quantum error correction methods.

Theoretical calculations describe the behavior of a large quantum circuit by taking advantage of certain symmetrical relationships between superconducting elements.

Adding impurities to a topological superfluid—a predicted state of matter believed to host Majorana particles—may be the best way to prove it exists.

Manganese defects in zinc oxide have been identified as a class of electrically controllable qubits.

Light stored in a Bose-Einstein condensate can be manipulated with light to create an optical AND gate.

Individual neutral atoms trapped in optical tweezers have been cooled to their quantum ground state, raising hopes that they can be used to process quantum information.

“Quantum keys” can be sent long distances on high-traffic optical fibers.

A quantum twist on digital holography offers improved imaging and the chance to reach new and difficult wavelength regions.

The quantum states of light emitted by quantum dots stand up to the rigors of frequency conversion.

State of the art quantum measurements show that the original formulation of Heisenberg’s uncertainty principle can be violated.

Quantum repeaters, devices that have been proposed for transporting encrypted information, could help collect light from distant telescopes in large area arrays.

With the right algorithm, quantum computers could tackle ubiquitous problems such as least-squares fitting of large data sets.

Quantum computing could be used to efficiently rank internet sites, according to a theoretical proposal.

New techniques for storing and retrieving polarized photons improve the quantum memory capabilities of rare-earth-doped crystals.

Testing hypotheses about the validity of different dynamical models can now be done on a much wider range of quantum systems.

Although perfect copies of a quantum state are prohibited, theory shows that recombining all imperfect clones recovers the original quantum state.

Quantum interference of pairs of photons emitted by nitrogen-vacancy centers in diamond paves the way for entanglement of distant qubits.