Search

Optical spin orientation of itinerant ferromagnets in twisted MoTe₂ homobilayers is demonstrated, enabling control of topological Chern numbers with circularly polarized light.

Laser-generated exciton–polariton condensates in transition metal dichalcogenide heterostructures may trigger Cooper pairing of electrons and induce high-temperature superconductivity.

Condensates of excitons have been observed in the quantum Hall regime, but evidence for their existence at low magnetic fields remains controversial. Now evidence of coherence between optically pumped interlayer excitons in MoS₂ marks a step towards confirming exciton condensation at low magnetic fields.

Minimization of kinetic energy leads to ferromagnetic correlations between itinerant electrons in MoSe₂/WS₂ moiré lattices even in the absence of exchange interactions.

Future quantum technologies will require interfaces between photons transmitting information and solid-state devices storing and manipulating it. Towards this aim, Gao et al.show the transfer of information from a single photon to a semiconductor quantum dot through quantum teleportation protocols.

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.

Electrically controlled quantum confinement of excitons to below 10 nm is achieved in a 2D semiconductor by combining in-plane electric fields with interactions between excitons and free charges.

The signature of a Wigner crystal—the analogue of a solid phase for electrons—is observed via the optical reflection spectrum in a monolayer transition metal dichalcogenide.

In semiconductor quantum dots, interactions between the confined electrons and the surrounding reservoir of nuclear spins limit the attainable electron-spin coherence. But the nuclear-spin reservoir can also take a constructive role, as it facilitates the locking of the optical quantum-dot resonance to the changing frequency of an external driving laser, as an experiment now demonstrates.

Fast, single-photon detection enables the observation of entanglement between a stationary quantum bit (a single quantum dot spin) and a propagating quantum bit (a single photon), marking a first step towards the implementation of a quantum network with nodes consisting of semiconductor spin quantum bits.

A. Kemal Topaloglu and colleagues report the identification of mutations in the neurokinin B receptor and its ligand in families with severe congenital gonadotropin deficiency and pubertal failure. These findings indicate that neurokinin B is a central regulator of human gonadal function.

A series of experiments that provide confirmation of the quantum nature of the quantum–dot–cavity system in the strong coupling regime by studying a photonic crystal nanocavity in which one, and only one, quantum dot is located precisely at the cavity electric field maximum.

Charge carriers in transition metal dichalcogenides have an extra degree of freedom known as valley pseudospin, which is associated with the shape of the energy bands. Experiments show that this pseudospin can be manipulated using magnetic fields.

Interacting nuclear spins on a crystalline lattice are commonly believed to be well described within a thermodynamic framework that uses the concept of spin temperature. Demagnetization experiments now challenge this belief, showing that in general the spin-temperature concept fails to describe a nuclear-spin ensemble in a quantum dot when strong quadrupolar interactions are induced by strain.

Competition between different possible ground states of strongly correlated electron systems can lead to the emergence of mixed states called microemulsions. Now this phenomenon is reported at the melting transition of a Wigner crystal.

A proposed device—an optical analogue of the superconducting Josephson interferometer—might enable detailed studies of the role that dissipation has in strongly correlated quantum-optical systems.

Zero-dimensional photonic quantum emitters can be realized using defects in the two-dimensional dichalcogenides.

Variants of the extracellular chaperone Clusterin are associated with Alzheimer’s disease (AD) and Clusterin levels are elevated in AD patient brains. Here, the authors show that Clusterin binds to oligomeric Tau, which enhances the seeding capacity of Tau aggregates upon cellular uptake. They also demonstrate that Tau/Clusterin complexes enter cells via the endosomal pathway, resulting in damage to endolysosomes and entry into the cytosol, where they induce the aggregation of endogenous, soluble Tau.

Studying quantum heat machines would extend our fundamental understanding of thermodynamics. Here, the authors report on absorption refrigeration within three normal modes of motion of a three-ion chain, studying performances using either thermal or squeezed states, also in the single-shot regime.

So-called topological properties can make quantum systems robust to a wide class of microscopic perturbations. Theoretical work now shows that topological features and phenomena occur not only in closed systems, but also in open quantum systems with appropriately engineered dissipation.

Two experiments observe the so-called ‘Mollow triplet’ in the emission spectrum of a quantum dot—originating from resonantly driving a dot transition—and demonstrate the potential of these systems to act as single-photon sources and as a readout modality for electron-spin states.

A promising approach to realizing a practical quantum bit scheme is the optical control of single electron spins in quantum dots. The reliable preparation and manipulation of the quantum states of such spins have been demonstrated recently. The final challenge is to carry out single-shot measurements of the electron spin without interfering with it. A technique has now been developed that enables such measurement, by coupling one quantum dot to another to produce a quantum dot molecule.

This Review covers recent advances in the implementation of spin–photon interfaces in semiconductor quantum dots, nitrogen–vacancy centres in diamond and emerging systems such as colour centres in other wide-bandgap materials.

Lithographically fabricated micrometre-scale superconducting circuits exhibit behaviour analogues to natural quantum entities, such as atom, ions and photons. Large-scale arrays of such circuits hold the promise of providing a unique route to quantum simulation. Recent progress in technology and methodology are reviewed here, and prospects and challenges discussed.

This review covers state-of-the-art quantum teleportation technologies, from photonic qubits and optical modes to atomic ensembles, trapped atoms and solid-state systems. Open issues and potential future implementations are also discussed.