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Showing 1–6 of 6 results
Advanced filters: Author: Abolfazl Bayat Clear advanced filters

  • So far, the notion of the order parameter for impurity quantum phase transitions has been missing. Using a two-impurity Kondo model, Bayat et al.show that the Schmidt gap obtained from the entanglement spectrum may serve as a nonlocal order parameter for a quantum impurity system at criticality.

    • Abolfazl Bayat
    • Henrik Johannesson
    • Pasquale Sodano
    ResearchOpen Access
    Nature Communications
    Volume: 5, P: 1-6

  • Quantum critical systems show great promise for advancing quantum sensing capabilities. Here the authors show that many-body systems undergoing a first-order quantum phase transition exhibit exponential scaling of sensitivity with system size, even when accounting for the preparation time of the critical state.

    • Saubhik Sarkar
    • Abolfazl Bayat
    • Roopayan Ghosh
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-11

  • Boundary time crystals are gaining attention due to their distinctive features like persistent oscillations at the thermodynamic limit. This work shows that the boundary time crystal phase transition can be exploited for quantum-enhanced sensitivity, which bridges many-body physics and quantum metrology and hence triggers broad interest in the condensed matter and quantum technology communities.

    • Victor Montenegro
    • Marco G. Genoni
    • Matteo G. A. Paris
    ResearchOpen Access
    Communications Physics
    Volume: 6, P: 1-9

  • Existing low-temperature thermometers can only perform with high precision within a narrow range. Here, the authors provide a bound for global thermometry across a wide range, including the design of optimal thermometers with the state-of-the-art quantum technologies.

    • Wai-Keong Mok
    • Kishor Bharti
    • Abolfazl Bayat
    ResearchOpen Access
    Communications Physics
    Volume: 4, P: 1-8