Single photons and quantum effects articles from across Nature Portfolio

To act as nodes in quantum networks, solid-state quantum dots must combine their high performance as quantum emitters with a quantum memory. Now, nuclear spins around a gallium arsenide quantum dot have been used as a many-body quantum memory register.

By resonant excitation of an InAs quantum dot embedded in a microcavity, a deterministic single-photon source is demonstrated. Single-photon purity of 0.9795(6), photon indistinguishability of 0.9856(13), and an overall end-to-end efficiency of 0.712(18) are simultaneously obtained.

Multiplexed entanglement distribution in a quantum network, with each node comprising multiple solid-state emitters in nanophotonic cavities, enables scalable quantum communication.

To achieve the goal of integrating cavity-enhanced quantum light emitters in a scalable way, we explored a new way to build a chip-integrated hybrid cavity like Lego games.

To act as nodes in quantum networks, solid-state quantum dots must combine their high performance as quantum emitters with a quantum memory. Now, nuclear spins around a gallium arsenide quantum dot have been used as a many-body quantum memory register.

A programmable integrated photonic circuit that works with single photons has enabled the construction of quantum-to-quantum Bernoulli factories, devices that process randomness in quantum states.

In a device comprising two double quantum dots separated by a 250-μm-long superconducting resonator, virtual photons in the resonator are shown to mediate the coupling of electron spins between the quantum dots. When the spin–spin coupling is activated for a controlled duration, oscillations between the spins are observed.

Creating entangled photon pairs often requires intense excitation of nonlinear materials or the active manipulation of quantum devices. Now, entanglement between two photons has been created by scattering a laser off a passive quantum dot.

A quantum control technique is used to directly couple trapped-ion motional modes with high fidelity, enabling non-destructive measurements of the quantum harmonic oscillator states of atomic motion. The strong coupling rate and precise manipulation of the quantum states achieved with this technique could lead to advances in quantum information processing.