Reset-Enhanced Dissipative Quantum Metrology

@misc{li2026resetenhanced,
  title = {{Reset-Enhanced Dissipative Quantum Metrology}},
  author = {Silan Li and Qingjun Tong and Ruicheng Bao},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.31249},
  eprint = {2610.31249},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.31249},
}

TY  - UNPB
TI  - Reset-Enhanced Dissipative Quantum Metrology
AU  - Silan Li
AU  - Qingjun Tong
AU  - Ruicheng Bao
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.31249
UR  - https://arxiv.org/abs/2610.31249
AB  - Quantum metrology is ultimately shaped not only by measurements, but also by the dissipative dynamics that prepare and maintain the probe. Nevertheless, a general mechanism for enhancing both steady-state and transient precision in open quantum systems has been lacking. Here we show that adding a simple reset channel provides such a mechanism: reset acts as a minimal dissipative control that can enhance metrological precision without modifying the intrinsic Hamiltonian or applying continuous coherent driving. We derive a unified quantum-Fisher-information (QFI) reset-rate response identity, showing how reset enhances steady-state and transient estimation while revealing a sharp transient distinction. For static-parameter estimation in diagonal dynamics, reset leaves the leading short-time QFI unchanged; for the separate task of elapsed-time estimation, it generates an immediate drift contribution that can scale quadratically with the reset rate in the short-time limit. For frequency estimation, the enhancement is instead dominated by a genuinely quantum eigenvector contribution. These results establish reset as a simple dissipative resource for open-system quantum metrology.
ER  -