Nature Physics, Published online: 08 August 2024; doi:10.1038/s41567-024-02605-x
An atom interferometer now maintains a spatial superposition state for 70 seconds, compared to few seconds in freely falling systems. This could improve measurements of the strength of gravitational fields and quantum gravity studies.
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Updated: daily
- Matter waves hang in there
- New order in the copper oxide phase diagramNature Physics, Published online: 02 August 2024; doi:10.1038/s41567-024-02602-0 A new ferroic-like phase has been discovered in highly doped superconducting cuprates. The existence of a well-defined order parameter on the supposedly disordered side of the phase diagram challenges the accepted theoretical framework.
- Spontaneous breaking of mirror symmetry in a cuprate beyond critical dopingNature Physics, Published online: 02 August 2024; doi:10.1038/s41567-024-02601-1 The Fermi liquid state in highly doped superconducting cuprates is normally thought of as disordered. Now, an observation of broken mirror symmetry in that phase suggests otherwise.
- Carrier density crossover and quasiparticle mass enhancement in a doped 5<i>d</i> Mott insulatorNature Physics, Published online: 02 August 2024; doi:10.1038/s41567-024-02564-3 The pseudogap in cuprates is often linked to superconductivity. Now bulk evidence for a pseudogap is found in doped non-superconducting Sr2IrO4, revealing that pseudogaps in doped Mott insulators are not necessarily a precursor to superconductivity.
- All real projective measurements can be self-testedNature Physics, Published online: 01 August 2024; doi:10.1038/s41567-024-02584-z Quantum correlations are strong enough that classical users can verify that a device produces quantum entangled states using only the outcomes of local measurements. This self-testing approach has now been extended to verifying quantum measurements.
- Publisher Correction: Transverse emittance reduction in muon beams by ionization coolingNature Physics, Published online: 30 July 2024; doi:10.1038/s41567-024-02616-8 Publisher Correction: Transverse emittance reduction in muon beams by ionization cooling
- Undetectable electrons in solids with two pairs of sublatticesNature 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.
- 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.
