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Despite being essential to many applications in quantum science, entanglement can be easily disrupted by decoherence. A protocol based on repetitive quantum error correction now demonstrates enhanced coherence times of entangled logical qubits.

This work presents a compact spectrometer using acoustic Brillouin scattering on a hybrid chip, achieving a 0.56 nm resolution in a 1 mm waveguide without an optical pump.

Microcombs are vulnerable to the environmental perturbations. Here, the authors propose a universal mechanism to fully control the microcombs. Based this reconfigurable microsoliton, a wavemeter with a precision of kHz is demonstrated.

Upconversion nanoparticles, which convert lower-energy light into higher-energy light, have many potential applications including sensing and imaging. Here, Wen et al. review recent advances that have addressed concentration quenching and enabled increasingly bright nanoparticles, opening up their full potential.

Stimulated Brillouin scattering is a non-linear interaction that allows light to be stored as coherent acoustic waves. Here, the authors report on Brillouin scattering-induced transparency in an optical microresonator whose high quality allows for long-lifetime non-reciprocal light storage.

Coherent conversion between optical and microwave photonics is needed for future quantum applications. Here, the authors combine thin-film lithium niobate and superconductor platforms as a hybrid electro-optic system to achieve high-efficiency frequency conversion between microwave and optical modes.

Single photon devices are needed for many future technologies, but resolving the color of single photons in a compact architecture is still a challenge. The authors present a broadband, chip-scale spectrometer for measuring single photon wavelengths from 600 to 2000 nm with no moving parts.

Developing planar phononic circuits analogous to photonic circuits are of interest to provide scalable advantages and complex manipulation of phonons. Here, the authors realize a phononic integrated circuit with a Gallium Nitride-on-sapphire platform, which provides strong confinement and control of phonons.

The authors introduce and demonstrate a programmable optically-driven organic micro-actuator for precise manipulation of on-chip structures. This paves the way for adaptive, multifunctional photonic systems.

Reconfigurable topological phononic circuits that are based on micrometre-scale unsuspended waveguides and operate at 1.5 GHz can be used to create a topological phononic Mach–Zehnder interferometer that rapidly switches topological phonon transmission paths.

Current bosonic quantum error correction codes exploit displacement or rotational symmetries in the quadrature phase space. Here, the authors generalise the concept by looking at potential symmetries and encoding in a broader number-phase space, where the known cat and binomial codes would correspond to rectangular lattices and be completed by other lattice codes like oblique and diamond.

Yttrium iron garnet is a ferrimagnetic insulator which demonstrates robust photon-spin coupling in hybrid microwave cavity systems. Here, the authors demonstrate a magnon gradient memory based on the dark modes of a strongly-coupled system of multiple yttrium iron garnet spheres.

Non-magnetic non-reciprocal transparency and amplification is experimentally achieved by optomechanics using a whispering-gallery microresonator. The idea may lead to integrated all-optical isolators or non-reciprocal phase shifters.

Optomechanical coupling enables an on-chip frequency comb and optical time-lens for 70-fold optical pulse compression.

Controlling qubit–phonon interactions is crucial for solid-state quantum devices. Two recent studies demonstrate that phononic bandgap engineering can alter these interactions, leading to enhanced qubit coherence and scalability.

Optical nonreciprocity through magneto-optical effects requires bulky apparatuses and strong magnetic fields, while magnetic-free approaches are difficult to implement. Here, the authors use optically-induced magnetisation in an atomic ensemble to get 50 dB of isolation over a large power dynamic range.

An optomechanical single-photon frequency shifter is demonstrated in integrated AlN waveguides. A frequency shift up to 150 GHz is achieved at telecom wavelength. The device shows near-unity efficiency and preserves the quantum coherence.

Using spin-5/2 nuclei of ¹⁷³Yb atoms trapped in an optical lattice, a Schrödinger-cat state persists for a coherence time of 1.4 × 10³ s. In measuring external magnetic fields, the cat state exhibits a sensitivity approaching the Heisenberg limit.

Non-classical states with a large, definite number of photons can now be produced in a superconducting cavity and used for quantum-enhanced sensing.

The lifetime of a qubit in a circuit quantum electrodynamics architecture can exceed the break-even point through quantum error correction, representing a key step towards scalable quantum computing.

Experimental studies about the trainability and generalization capacities of quantum neural networks are highly in need. Here, the authors implement a previously proposed parametrization and training scheme using a 6-qubit superconducting quantum processor.

Hybrid quantum systems would allow interfacing superconducting nodes with optical links. Here, the authors demonstrate an integrated platform where 10 GHz phonons are resonantly coupled with photons in a superconducting cavity and a nanophotonic cavity at the same time, allowing efficient mediation of bidirectional microwave-optical conversion.

Photonic-chip-based microcomb solitons driven by Pockels nonlinearity—the quadratic χ⁽²⁾ effect—instead of the Kerr soliton are demonstrated in an aluminium nitride microring resonator with a conversion efficiency of 17%.