Non-Markovian effect on quantum optical metrology under dissipative environment

• URL: http://arxiv.org/abs/2002.03378v3
• Date: Thu, 27 Feb 2020 03:07:51 GMT
• Title: Non-Markovian effect on quantum optical metrology under dissipative environment
• Authors: Kai Bai, Hong-Gang Luo, Wenxian Zhang, Meng Xiao
• Abstract summary: Non-Markovian effects are shown to be effective in performing quantum optical metrology under locally dissipative environments. Our work provides a recipe to realize ultrasensitive measurements in the presence of noise by utilizing non-Markovian effects.
• Score: 1.6058099298620423
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum metrology utilizes quantum effects to reach higher precision measurements of physical quantities compared with their classical counterparts. However the ubiquitous decoherence obstructs its application. Recently, non-Markovian effects are shown to be effective in performing quantum optical metrology under locally dissipative environments\cite{PhysRevLett.123.040402}. However, the mechanism is still rather hazy. Here, we uncover the reason why forming a bound state can protect the quantumness against a dissipative ambient via the quantum Fisher information of entangled coherent states. An exact analytical expression of the quantum Fisher information in the long-encoding-time condition is derived, which reveals that the dynamics of precision can asymptotically reach the ideal-case-promised one easily when the average photon number is small. Meanwhile, the scaling exhibits a transition from the weak Heisenberg limit to the sub-classical limit with the increase of average photon number. Our work provides a recipe to realize ultrasensitive measurements in the presence of noise by utilizing non-Markovian effects.

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