Quantum physics articles from across Nature Portfolio

The authors present a report on the Quantum Matter 2023 international conference and expo that took place in Madrid, on June 2023.

Loss of photons over long-distance connections limits the development of quantum networks, necessitating the use of quantum ‘repeater’ systems to boost signals between network nodes. Erbium ions incorporated into calcium tungstate crystals have been found to emit photons in the telecommunications frequency band that are indistinguishable from each other, and thus show promise for use in such repeaters.

Quantum communication networks are expected to exceed the performance of communications systems based on classical physics in terms of security and communication efficiency and contribute towards the formation of quantum internet. Here, the authors present a model of complex quantum communication networks based on quantum Ising spins where entangled clusters serve as efficient communication channels.

A low-power radio-frequency multiplexing cryo-electronics system, which is based on complementary metal–oxide–semiconductor technology, can operate below 15 mK and provide the control and interfacing of superconducting qubits with minimal cross-coupling.

Adiabatic quantum annealers offer a promising path to establish an edge over classical computation, even though the demonstration of an advantage is still open. In this paper, the authors employ Quantum RBMs on Adiabatic quantum annealers, finding orders-of-magnitude speed-up compared to classical computers on real-world cybersecurity tasks for negative phase sampling.

The authors present a report on the Quantum Matter 2023 international conference and expo that took place in Madrid, on June 2023.

Loss of photons over long-distance connections limits the development of quantum networks, necessitating the use of quantum ‘repeater’ systems to boost signals between network nodes. Erbium ions incorporated into calcium tungstate crystals have been found to emit photons in the telecommunications frequency band that are indistinguishable from each other, and thus show promise for use in such repeaters.

Computational rules might describe the evolution of the cosmos better than the dynamical equations of physics — but only if they are given a quantum twist.

The remarkable properties of graphene nanoribbons are promising for use in quantum technologies. To create quantum devices, however, individual nanoribbons must be contacted. This crucial step has now been demonstrated using single-walled carbon nanotubes as electrodes.

A milestone for the coherence time of a macroscopic mechanical oscillator may be a crucial advance for enabling the development of quantum technologies based on optomechanical architectures and for fundamental tests of quantum mechanics.

Generating high harmonics or attosecond pulses of light is normally thought of as a classical process, but a theoretical study has now shown how the process could be driven by quantum light.