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Optical frequency combs power technologies like communication but face stability issues in miniaturization. Here, authors present a self-locked microcomb in a lithium niobate chip by combining electro-optic, Kerr, and Raman effects, achieving a 300 nm span and low noise without external feedback.

Universal control of the state of qubits on timescales much shorter than the coherence time is necessary for quantum computation. The authors demonstrate electrical control of a charge qubit in quantum dots on the picosecond scale, which is orders of magnitude faster than previously reported.

Non-neighbouring mechanical resonators can interact via indirect coupling. Here, the authors leverage a resonant phonon cavity in a graphene-based electromechanical system to demonstrate strong indirect coupling between separated mechanical resonators.

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.

Integrated quantum memories based on ¹⁵¹Eu³⁺:Y₂SiO₅ crystals coupled with impedance-matched optical cavities are demonstrated. Multiplexed quantum storage efficiencies of 80.3% and 69.8% are achieved for weak coherent pulses and telecom-heralded single photons, respectively.

Photonic quantum memories are necessary for quantum information networks and can be built using cold atomic gases. In this work, Ding et al. show the first storage and retrieval of single photons carrying orbital angular momentum using electromagnetically induced transparency in a cold rubidium ensemble.

Establishing multi-degree-of-freedom entangled memories is important for high-capacity quantum communications and computing. Here, authors experimentally demonstrate hyper- and hybrid entanglement between two atomic ensembles in multiple degrees of freedom including path and orbital angular momentum.

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.

Generation of multipartite entanglement between quantum states is crucial for developing quantum computation systems, although it has proven harder to achieve for photons than ions. Here, an eight-photon entangled state based on four independent photon pairs is observed, beating the previous record of six.

Different types of correlations in quantum mechanical systems are crucial for quantum information processing. Xu and colleagues determine the sizes of classical correlations, entanglement and other types of quantum correlations in an optical setup.

Subwavelength focusing of electromagnetic fields often uses evanescent waves and nanostructures to aid confinement. Here, the authors localize a microwave field to 6 orders of magnitude smaller than the wavelength, by coupling to confined electron oscillations in a hybrid nanowire-bowtie antenna.

Quantum memories are key components for quantum communication, but current storage times are still too short. Here, the authors use the atomic frequency comb protocol in a zero-first-order-Zeeman field to coherently store an optical pulse for an hour in a cryogenically cooled rare-earth doped crystal.

Dissipative many body systems provide quantum-enhanced sensitivity to external near gap-closing points. Here, the authors demonstrate record sensitivity in a Rydberg-atomic platform in correspondence of folded hysteresis trajectories under external microwave driving

A round-robin differential phase shift protocol, in which monitoring of the signal disturbance is unnecessary, has been experimentally realized. With 65 pulses in each packet, the system can distribute a secret key over a distance of 90 km.

A quantum memory based on a Raman scheme is implemented for photonic qubits encoded in the path and polarization of single photons. The performance is quantified before and after storage in cold atomic ensembles and the storage bandwidth is ∼140 MHz.

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.

Geometric quantum gates—engineered evolution paths for qubit control—promise noise resilience but have shown limited fidelity in prior implementations in semiconductor quantum computation. Here the authors demonstrate high-fidelity single-qubit gates in a single-hole quantum dot in Ge, outperforming conventional dynamical gates.

Distributed quantum sensing typically requires shared reference frames to coordinate measurements. Here, authors develop a reversed-encoding protocol that circumvents this requirement, enabling Heisenberg-limited precision in quantum networks without frame alignment.

Quantum light sources are promising for quantum circuits, yet facing an inherent trade-off between multifunction and brightness. By leveraging a strategy based on parity-time symmetry, we demonstrate an on-chip quantum light source with programmable lifetime, achieving a 20-fold tuning range of lifetime and balanced photon-pairs generation rate.

Optically active defects in hBN are promising for quantum sensing and information applications, however, coherent control of a single defect has not been achieved so far. By using an efficient method to produce arrays of defects in hBN, Guo et al. isolate a new carbon-related defect and show its coherent control.

This work proposed a fully heterogeneous quantum network that connects diverse user systems and enables multiple quantum tasks. A software-defined quantum network structure is also proposed for coordinating network nodes and optimizing network performance. It paves the way for an open and versatile quantum internet.

Coherence is widely seen as essential for quantum source quality. Here, authors demonstrate on-chip photon states with increased brightness and purity using incoherent light. It reveals the mechanism of pump coherence and lowers the barrier for the generation of high-quality quantum states.

Alkene-terminated silicon carbide surfaces are proposed as a room-temperature divacancy spin qubit quantum sensor suitable for bioimaging and nanoscale nuclear spin sensing.

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.

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.

Photonic synthetic dimension (on TFLN chip) attracts broad interest. Here, authors achieve tunable couplings via MZI-linked resonators, and prove its versatility by realizing multiple models including tight-binding lattice, the Hall ladder and Creutz ladder along with their featured phenomena

Quantum-information processing requires gates that can operate on multiple qubits. Here, the authors demonstrate a controlled-NOT gate operation on two coupled charge qubits comprising electrons confined in semiconductor double quantum dots.

Experimental demonstrations of genuine high-dimensional multipartite quantum nonlocality have been lacking so far. Here, the authors fill this gap using entangled photons, surpassing qubit-based limits and paving the way for device-independent quantum information processing in more complex systems.

Van der Waals NbOCl2 crystal is a candidate platform for subwavelength thin film photon-pair sources. Here, the authors demonstrate generation of polarization entangled states from a two-layer stack of orthogonally oriented van der Waals crystal.

A van der Waals crystal, niobium oxide dichloride, with vanishing interlayer electronic coupling and considerable monolayer-like excitonic behaviour in the bulk, as well as strong and scalable second-order optical nonlinearity, is discovered, which enables a high-performance quantum light source.

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.

Harnessing multiple degrees of freedom of quantum states on chip could improve quantum information processing. Here, the authors demonstrate coherent conversion of quantum states between path, polarization and transverse waveguide-mode degrees of freedom in a quantum photonic integrated circuit.

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.

Researchers experimentally realize the quantum delayed-choice experiment and show that the quantum wave–particle superposition is clearly different from the classical mixture by comparing interference fringes under various conditions. This work reveals the deep relationship between the complementarity principle and the superposition principle of light.

Hole-spin qubits in germanium are promising candidates for rapid, all-electrical qubit control. Here the authors report Rabi oscillations with the record frequency of 540 MHz in a hole-based double quantum dot in a germanium hut wire, which is attributed to strong spin-orbit interaction of heavy holes.

Normally, quantum operations are thought of as being applied in a particular order, but it is possible to create superpositions of different orders. An experiment now demonstrates this indefinite causal order may give an advantage for quantum sensing.

Quantum technologies allow memory advantages in simulating stochastic processes, but a demonstration of this for non-Markovian processes (where the advantage would be stronger) has been missing so far. Here the authors fill this gap analytically and experimentally, using a single qubit memory to model non-Markovian processes.

Quantum repeaters are critical components for distributing entanglement over long distances, and they can be improved by the elimination of multi-photon-pair events. Here, the authors demonstrate the storage of single photons emitted by a quantum dot in a polarization maintaining solid-state memory.

Long-range interactions in many-body quantum systems may induce dissipation channels described by non-Hermitian dynamics. Here, the authors report the observation of higher-order exceptional points, a hallmark of non-Hermitian physics, in a Rydberg atom gas. This enables design of quantum dynamics around these points, providing insight into phase transitions.

An open quantum system loses its ‘quantumness’ when information about the state leaks into its surroundings. Researchers now control this so-called decoherence in a single photon. By rotating an optical filter, the information flow between the photon and its environment can be tuned. This concept could be harnessed for future quantum technologies.

A universal pseudo-cooling method based on a Maxwell-demon-like swapping sequence is proposed. A controlled Hamiltonian gate is used to identify lower energy states of the system and to drive the system to those states. An experimental implementation using a quantum optical network exhibits a fidelity higher than 0.978.

Understanding the coherent dynamics of electron and nucleus spins in hBN is crucial for their applications as qubits and quantum sensors. Here the authors report room-temperature coherent manipulation of the negatively charged boron vacancy spins in hBN and study their dynamics under weak and strong magnetic fields.

Heisenberg’s uncertainty principle limits the precision with which we can measure two complementary properties of a quantum system. Entanglement, it has previously been proposed, can relax these constraints. This idea is now demonstrated experimentally with the aid of polarization-entangled photons.

The time crystal is an exotic phase of matter where time-translational symmetry is broken. Here, the authors observe multiple continuous dissipative time crystals and bifurcation of time crystals in driven and dissipative Rydberg atomic gas.