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

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. 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.

Automated summary

Research has found that the precision of metrology can be significantly improved in non-Markovian open quantum systems by utilizing the quantum Zeno effect (QZE). A recently developed quantum simulation approach has experimentally demonstrated that entangled probes can improve the precision in this scenario.