Although mechanical resonators are routinely cooled to their quantum ground state, it has remained unclear if sizable nonlinearities could persist there. Experiments in the ultrastrong-coupling regime now show that this is possible.

The performance of superconducting qubits is often limited by spurious two-level systems. Now, a qubit operating as a heat engine manipulates its bath of nearby two-level systems, providing insights into their dynamics and interactions.

Some driven systems sustain non-equilibrium phases in which phase transitions occur without symmetry breaking. The use of a laser-cooled atomic cloud confined in a pencil beam now allows the demonstration of such a system.

The interplay of quantum measurements and unitary evolution is expected to produce dynamical phases with different entanglement properties. An entanglement phase transition has now been detected with hybrid quantum circuits in a superconducting processor.

Strong dipole–dipole interactions between excitons in a moiré superlattice create a manifestation of the Bose–Hubbard model with a ground state similar to a Mott insulator.

Laser-driven shock compression experiments yield the melting curve of the superionic phase of ammonia at conditions relevant to the interiors of Uranus and Neptune.

The eco-system of companies and start-ups developing quantum technologies is booming, but the disparity between private and public funding may become an issue in the absence of commercial uses.

Despite their differences, the six regional metrology organizations work together to provide and advance the global equivalence of national measurements standards, as Hyun Min Park explains.

As sharing of research data becomes more important, we are facilitating this by integrating the Figshare repository into our submission system.