4.8 Article

Quantum Sensing with a Single-Qubit Pseudo-Hermitian System

Journal

PHYSICAL REVIEW LETTERS
Volume 124, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.020501

Keywords

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Funding

  1. National Natural Science Foundation of China [11874024, 11574103, 11690030, 11690032]
  2. National Key R&D Program of China [2018YFA0306600]
  3. Fundamental Research Funds for the Central Universities
  4. Young Scientists Fund of the National Natural Science Foundation of China [11804110]

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Quantum sensing exploits the fundamental features of a quantum system to achieve highly efficient measurement of physical quantities. Here, we propose a strategy to realize a single-qubit pseudo-Hermitian sensor from a dilated two-qubit Hermitian system. The pseudo-Hermitian sensor exhibits divergent susceptibility in a dynamical evolution that does not necessarily involve an exceptional point. We demonstrate its potential advantages to overcome noises that cannot be averaged out by repetitive measurements. The proposal is feasible with the state-of-art experimental capability in a variety of qubit systems, and represents a step towards the application of non-Hermitian physics in quantum sensing.

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