Quantum sensing with a single-qubit pseudo-Hermitian system

Abstract

Quantum sensing exploits fundamental features of 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 dynamical evolution that does not necessarily involve 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.

6 pages, 3 figure, comments are welcome

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Cited by in corpus (35)

• Non-Hermitian Physics
• Dynamic framework for criticality-enhanced quantum sensing
• Entanglement-enhanced quantum metrology: from standard quantum limit to Heisenberg limit
• Quantum squeezing and sensing with pseudo anti-parity-time symmetry
• Fundamental Sensitivity Limits for non-Hermitian Quantum Sensors
• Fundamental limits for reciprocal and non-reciprocal non-Hermitian quantum sensing
• Strong quantum metrological limit from many-body physics
• Exceptional entanglement phenomena: non-Hermiticity meeting non-classicality
• Non-Markovian Sensing of a Quantum Reservoir
• Non-Hermitian sensing in the absence of exceptional points
• Experimental Simulation of Symmetry-Protected Higher-Order Exceptional Points with Single Photons
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• Quantum battery with non-Hermitian charging
• Multiparameter estimation perspective on non-Hermitian singularity-enhanced sensing
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• Theory of Compression Channels for Postselected Quantum Metrology
• Algebraic maximum violation of the Leggett-Garg inequality in a two-level system under PT symmetric dynamics
• Unitary Scattering Protected by Pseudo-Hermiticity
• Anomalous spontaneous emission dynamics at chiral exceptional points
• Phase Transitions and Virtual Exceptional Points in Quantum Emitters Coupled to Dissipative Baths
• Fractal Nodal Band Structures
• Unconventional steady states and topological phases in an open two-level non-Hermitian system
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• Achieving the Quantum Fisher Information Bound in Pseudo-Hermitian Sensors
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