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Memory Effects in Quantum Metrology.

Yuxiang Yang1

  • 1Institute for Theoretical Physics, ETH Zürich, 8093 Zürich, Switzerland.

Physical Review Letters
|October 2, 2019
PubMed
Summary
This summary is machine-generated.

We introduce quantum comb metrology for estimating physical processes using quantum memory. This research shows quantum memory significantly enhances estimation accuracy in quantum sensors.

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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Sensing

Background:

  • Standard quantum metrology estimates parameters using repeated, identical quantum channel uses.
  • Existing frameworks do not fully address estimation of complex physical processes involving quantum memory.

Purpose of the Study:

  • To extend quantum metrology to the estimation of parametrized quantum combs, which utilize quantum memory.
  • To develop a theoretical framework and derive bounds for quantum comb metrology.

Main Methods:

  • Development of a theoretical framework for quantum comb metrology.
  • Derivation of a general upper bound for the comb quantum Fisher information.
  • Analysis of a specific example to demonstrate bound attainability.

Main Results:

  • A general upper bound for comb quantum Fisher information was derived.
  • This bound is operationally linked to the quantum Fisher information of memoryless channels.
  • An example demonstrated the bound's attainability, highlighting the role of quantum memory.

Conclusions:

  • Quantum comb metrology offers a new paradigm for parameter estimation in quantum systems with memory.
  • Quantum memory plays a critical role, enhancing estimation precision beyond standard quantum metrology.
  • The derived bounds provide a benchmark for designing advanced quantum sensors.