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Performance of solid-state triplet fusion upconversion films is enhanced by surface plasmons, intensity threshold is reduced by a factor of 17 and external quantum efficiency is enhanced by a factor of 19. A white-emitting organic light-emitting diode featuring upconverted blue emission—rather than blue electroluminescence—is demonstrated, with a colour rendering index of up to 86.2.

Light-matter interfaces implementing arbitrary conditional operations on incoming photons would have several applications in quantum computation and communications. Here, the authors demonstrate conditional polarization rotation induced by a single quantum dot spin embedded in an electrically contacted micropillar, spanning up to a pi flip.

A modular quantum system-on-chip architecture integrates thousands of individually addressable spin qubits in two-dimensional quantum microchiplet arrays into an integrated circuit designed for cryogenic control, supporting full connectivity for quantum memory arrays across spin–photon channels.

X-ray photons emitted by free electrons travelling in van der Waals materials show energy shifts induced by quantum recoil, thus offering a viable route to generating tailored and tunable single X-ray photons.

Electron spins in solid usually relax their energy through the coupling with phonons in the host lattice. By using the coupling to microwave photons in a cavity as an alternative relaxation path, it is demonstrated that spins can be cooled below the lattice temperature.

Biomolecular condensates of Eps15 recruit and assemble clathrin. In turn, clathrin assembly restricts condensate growth while imposing the preferred curvature of the clathrin lattice.

HTLV-1 type-C causes more severe disease than type-A, but the underlying reason is unclear. Here the authors show in a macaque model how type-C orf-I affects lung pathogenesis and the immune response to HTLV-1, providing a model to test viral targets for disease prevention.

A tilted plasmonic nanocavity enables shortening of the luminescence decay time of a rare-earth-doped nanoparticle to sub-50 ns. High quantum efficiency enhancement, chiral polarization and directional far-field emission are maintained.

The condensation of repeat-containing RNAs can have neurotoxic effects but is challenging to study. Now a NMR approach termed condensate detection by semi-solid magnetization transfer (CONDENSE-MT) can be used to study RNA condensate dynamics, proton–solvent exchange kinetics and condensate hydration.

An integrated nanoscale light-emitting diode is used as an electrically driven optical source for exciting two-dimensionally localized gap plasmon waveguides with a 0.016λ² cross-sectional area. Electrically driven subwavelength optical nanocircuits for routing, splitting and directional coupling are demonstrated in compact and relatively low-loss gap plasmon waveguide structures.

The use of photonic crystals to trap atoms on a chip offers unique possibilities for atom–light interactions. Advancing towards this goal, the authors realize photonic crystal waveguides where the electronic transition frequencies of localized caesium atoms are aligned with the band edges of the waveguides.

Efficient qubit readout is essential for quantum information technology, which requires sufficient recognition of signal from noise. Here, Krantz et al. propose a simplified technique using a Josephson parametric oscillator, demonstrating single-shot readout performance of a superconducting qubit.

A three-partite cluster state made of one semiconductor spin and two indistinguishable photons is generated from an InGaAs quantum dot embedded in a pillar microcavity. The three-partite entanglement rate is 0.53 MHz at the output of the device.

A materials platform using tantalum as a base layer and silicon as the substrate to construct superconducting qubits enables device performance improvements such as millisecond lifetimes and coherence times, as well as high time-averaged quality factors.

OLEDs that emit circularly polarized light are essential for many technologies. Here, the authors develop OLEDs based on chiral nanoparticles that have large emission dissymmetry factors and high external quantum efficiencies.

Graphene’s exotic properties make it suitable for many different optoelectronic devices. Brar et al. show that graphene plasmonic resonators can be exploited to produce narrow spectral emission in the mid-infrared, whose frequency and intensity can be modulated by electrostatic gating.

An allosteric site on the E3 ligase adapter cereblon can be targeted to modulate the efficacy of cereblon in targeted protein degradation applications.

In a surface code consisting of four data and three ancilla qubits, repeated error detection is demonstrated. The lifetime and coherence time of the logical qubit are enhanced over those of any of the constituent qubits when no errors are detected.

Metallic nanoantennas can be used to enhance and tailor the photoluminescence effects in small-scale devices. Huanget al.design combined nanoantenna electrodes for quantum well nanoscale light-emitting diodes, to both inject charge and control the electroluminescence properties.

Superconducting circuits are promising for quantum computing, but quasiparticle tunnelling across Josephson junctions introduces qubit decoherence. Ristè et al. convert a transmon qubit into its own real-time quasiparticle tunnelling detector and accurately measure induced decoherence in the millisecond range.

Two-dimensional arrays of plasmonic nanoparticles coupled with a gain medium can behave as a surface-emitting laser with near-zero group velocity and picosecond dynamics.

Superconducting qubits operate at microwave frequencies, but it is much more efficient to transmit information optically. Now, a superconducting qubit has been controlled with an optical signal by using a microwave–optical quantum transducer.

The coherent operation of individual ³¹P electron and nuclear spin qubits in a ²⁸Si substrate shows new benchmark decoherence times and provides essential information on the dechorence mechanism.

Individual emitters of light in close proximity, such as atoms, can couple together via the light they create leading to a concentrated burst of radiation. Here Mlynek et al.experminetally explore the fundamental origin of this superradiance by studying two superconducting qubits coupled to a microwave cavity.

An optically addressable fluorescent-protein spin qubit is realized using enhanced yellow fluorescent protein; the qubit can be coherently controlled at liquid-nitrogen temperatures and the spin detected at room temperature in cells.

Precise and scalable generation of high-quality NV centers is crucial for their integration into quantum devices. Here the authors demonstrate the high-yield controlled fabrication of highly coherent NV centers in prefabricated nanostructures with three-dimensional nanoscale spatial confinement, using a combination of δ-doping and focused electron beam irradiation.

Correlated errors coming from leakage out of the computational subspace are an obstacle to fault-tolerant superconducting circuits. Here, the authors use a multi-level reset protocol to improve the performances of a bit-flip error correcting code by reducing the magnitude of correlations.

Hybrid quantum devices combine different platforms with the prospect of exploiting the advantages of each. Scarlino et al. demonstrate strong, coherent coupling between a semiconductor qubit and a superconducting qubit by using a high-impedance superconducting resonator as a quantum bus.

Here, the authors propose an approach for harnessing nonlinear resonant scattering called stimulated plasmon polariton scattering. The proposal allows the excitation, amplification and detection 2D plasmon and phonon polaritons all across the THz-range while requiring optical components in the near-IR or visible range.

The distribution of Berry charge over a ring of exceptional points, called a Weyl exceptional ring, is experimentally demonstrated.

Deterministic generation of photonic multi-partite entangled states has previously been achieved for specific states using ad-hoc devices. Here, the authors present a single superconducting circuit device to deterministically generate a variety of states, namely W, GHZ, and cluster states.

Using a superconducting circuit analogue of an atom in front of a mirror it is possible to shape the modes of the quantum vacuum and hide the atom from the vacuum fluctuations.

This article presents a unique nanocomposite plasmonic-excitonic glass with extraordinary amplified optical properties: ultra-narrow photoluminescence (FWHM = 13 nm) and ultrashort photoluminescence lifetime (90 ps) at room temperature

Exploiting optical multimodal confinement, the deep-subwavelength confinement of hyperbolic phonon polaritons is demonstrated in isotopically pure hexagonal boron nitride, enabling nanoscale polariton manipulation.