Nature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02607-9
Angle-resolved photoemission spectroscopy measurements identify dark electron states in palladium diselenide, cuprate superconductors, and lead halide perovskites. These dark states are attributed to the two pairs of sublattices in each of the solids, which leads to a double two-level quantum system in which double destructive interference can occur.
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- Undetectable electrons in solids with two pairs of sublattices
- Scalable spin squeezing with local interactionsNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02563-4 Spin-squeezed states are a resource for quantum-enhanced precision measurement. However, the theoretical foundations for scalable spin squeezing — where quantum enhancement grows with system size — have only been established for systems exhibiting all-to-all interactions. Now, by unveiling a connection to finite-temperature magnetism, scalable squeezing is extended to locally interacting systems.
- A single quantum dot passively mediates entanglementNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02582-1 Creating entangled photon pairs often requires intense excitation of nonlinear materials or the active manipulation of quantum devices. Now, entanglement between two photons has been created by scattering a laser off a passive quantum dot.
- Precise control and non-destructive readout of quantum states of ion motionNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02599-6 A quantum control technique is used to directly couple trapped-ion motional modes with high fidelity, enabling non-destructive measurements of the quantum harmonic oscillator states of atomic motion. The strong coupling rate and precise manipulation of the quantum states achieved with this technique could lead to advances in quantum information processing.
- Scalable spin squeezing from finite-temperature easy-plane magnetismNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02562-5 Generating highly squeezed states for quantum sensing requires precise entanglement properties, which makes it a hard task. Now a conjecture identifies a realistic regime of magnetic order at finite temperatures that enables scalable spin squeezing.
- Dark states of electrons in a quantum system with two pairs of sublatticesNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02586-x The identification of dark states—quantum states that do not interact with photons—in real materials may help to address many unsolved issues in condensed-matter physics. Now, they have been identified in palladium diselenide.
- Flow physics guides morphology of ciliated organsNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02591-0 The ducts of many fluid-pumping organs feature cilia. Two structural parameters organize the different types of ducts into a continuous spectrum between ciliary carpet and flame designs depending on the fluid-pumping requirements.
- Transient absorption of warm dense matter created by an X-ray free-electron laserNature Physics, Published online: 29 July 2024; doi:10.1038/s41567-024-02587-w Warm dense copper, created by an X-ray free-electron laser, features a transition from reverse saturable absorption to saturable absorption. The results can be used to benchmark non-equilibrium models of electronic structure in warm dense matter.
