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Entanglement-Enhanced Quantum Metrology in Colored Noise by Quantum Zeno Effect

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Version 2 2023-06-08, 12:57
Version 1 2023-01-12, 16:02
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posted on 2023-06-08, 12:57 authored by Xinyue Long, Wan-Ting He, Na-Na Zhang, Kai Tang, Zidong Lin, Hongfeng Liu, Xinfang Nie, Guanru Feng, Jun Li, Tao Xin, Qing Ai, Dawei Lu
In open quantum systems, the precision of metrology inevitably suffers from the noise. {In Markovian open quantum dynamics, the precision can not be improved by using entangled probes although the measurement time is effectively shortened.} However, it was predicted over one decade ago that in a non-Markovian one, the error can be significantly reduced by the quantum Zeno effect (QZE) [Chin, Huelga, and Plenio, Phys. Rev. Lett. \textbf{109}, 233601 (2012)]. In this work, we apply a recently-developed quantum simulation approach to experimentally verify that entangled probes can improve the precision of metrology by the QZE. Up to $n=7$ qubits, we demonstrate that the precision has been improved by a factor of $n^{1/4}$, which is consistent with the theoretical prediction. Our quantum simulation approach may provide an intriguing platform for experimental verification of various quantum metrology schemes.

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