Browse Physics

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

States consisting of three qubits provide a way of understanding how quantum entanglement relates to nonlocality.

Spin-dependent forces create quantum superpositions of different structures of a trapped ion crystal.

Quantum superpositions of objects consisting of millions of atoms may be achievable with cavity quantum optomechanical techniques.

A newly found fundamental limitation puts bounds on the accuracy of measurements in quantum-mechanical systems.

In the theory of statistical information processing, what is the minimum amount of energy needed to make a measurement and then erase its memory?

Quantum graphs are convenient mathematical tools for describing complex molecules and networks of quantum wires. Scientists are addressing the question: When and how fast can a wave function spread out over the entire graph?

When two bulk objects are separated by a sufficiently small distance, quantum fluctuations in the electromagnetic field give rise to Casimir forces between them. Two papers explore how these forces are affected by the electrical properties of the materials.

Bell showed that quantum entanglement cannot be modeled with local hidden variables alone. Now, physicists argue that only models based exclusively on nonlocal hidden variables can reproduce all possible quantum correlations.

Theorists show that the quantum critical states of fermions may have fractal character and predict signatures of this result in liquid 3He, a fermionic fluid.

The Dirac and Klein-Gordon equations provide a full relativistic description for particles with spin ½ and 0, respectively. A calculation now shows how to extend this description to particles, such as nuclei, with spin greater than ½.