Optimal Generators for Quantum Sensing

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Abstract

We propose a computationally efficient method to derive the unitary evolution that a quantum state is most sensitive to. This allows one to determine the optimal use of an entangled state for quantum sensing, even in complex systems where intuition from canonical squeezing examples breaks down. In this paper we show that the maximal obtainable sensitivity using a given quantum state is determined by the largest eigenvalue of the quantum Fisher information matrix (QFIM) and, importantly, the corresponding evolution is uniquely determined by the coinciding eigenvector.

Year of Publication
2023
Date Published
2023-10
Journal Title
Physical Review Letters
Volume
131
Issue
15
Start Page or Article ID
150802
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