Browse Physics

Controlling the spin and geometric phase of electrons in a semiconductor ring.

Interacting atoms mimic the behavior of identical fermions.

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

A technique from ion spectroscopy reveals the quantum nature of a mechanical system at low temperature.

Macroscopic quantum properties of helium-4, one of the simplest and oldest elements in the universe, continue to puzzle and amaze scientists. Supertransport in solid helium-4 is the most elusive and controversial conundrum of all.

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

A new thought experiment makes it clearer than ever that photons aren’t simply particles or waves.

Although the quantum Rabi model is the simplest model describing the coupling of quantum light and matter, only now has an analytical solution been found.

In the Aharonov-Bohm effect, proposed in 1959, quantum particles are affected in measurable ways by the classical electromagnetic potential, previously regarded as a purely mathematical construct. The electromagnetic field is too far from the particles to have any direct influence.

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.

Two objects made of the exotic materials known as topological insulators could repel one another through the quantum-mechanical forces that cause most other solids to attract, theorists predict.

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

A new laser-based technique can directly probe the coupling of electrons in photosynthetic proteins and other complex systems.

The quantum jiggling that molecules experience even at the lowest temperatures–motion associated with the uncertainty principle–is not as tiny as researchers assumed and may be detected in the scattering of light through a liquid.

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?

A pair of vibrating membranes could be cooled to their quantum mechanical ground state using current technology, and they could show a variety of quantum behaviors, according to calculations.

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.