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Fisher information of a nonequilibrium anharmonic donor-acceptor rectifier

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  • Thakuria, Bitap Raj
  • Kalita, Trishna
  • Akhtar, Javed
  • Goswami, Himangshu Prabal

Abstract

We investigate a nonequilibrium donor-acceptor quantum rectifier system coupled to an anharmonic vibrational mode, treating the vibrational dynamics both as a two-level system and as a multilevel system. The time-dependent Fisher information is then calculated by deriving a quantum master equation for the reduced system dynamics. We estimate some key rectifier parameters, the donor energy, the acceptor energy, and the vibrational frequency. We report that there is an optimal time for estimating the donor and acceptor energies. The acceptor energy or the donor energy modifies the dominant decay mode or superoperator gap to create a short-lived optimal time window for estimation, while this is the other way round for the anharmonic mode. The anharmonic mode can be best estimated in the steady state. Donor energy shows limited sensitivity, while vibrational frequency estimation benefits from low temperatures. This work offers a theoretical foundation for enhancing parameter estimation in nanoscale quantum devices, guiding future sensing and metrological applications in quantronic systems.

Suggested Citation

  • Thakuria, Bitap Raj & Kalita, Trishna & Akhtar, Javed & Goswami, Himangshu Prabal, 2026. "Fisher information of a nonequilibrium anharmonic donor-acceptor rectifier," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 697(C).
    • Handle: RePEc:eee:phsmap:v:697:y:2026:i:c:s0378437126004590
    DOI: 10.1016/j.physa.2026.131723
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