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Quantum Fisher information and quantum metrology
2014-04-16     Text Size:  A

Colloquium

Title
题目

Quantum Fisher information and quantum metrology

 

Speaker
报告人

王晓光 教授

Home Institute

所在单位

浙江大学

Date
日期

2014-04-16  PM 16:00 Wednesday

Venue
地点

ITP New Building 6620, 理论物理研究所新楼六层报告厅

Abstract
摘要

We first introduce some basic concepts of Fisher information, and then its applications in quantum phase transitions. We find a phase-matching condition for enhancement of sensitivity in a Mach-Zehnder interferometer illuminated by an arbitrary state in one input port and an odd (even) state in the other port. Under this condition, the Fisher information becomes maximal with respect to the relative phase of two modes, and the phase sensitivity is enhanced. For the case with photon losses, we further find that the phase-matching condition remains unchanged with a coherent state and a coherent superposition state as the input states.

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