Dissipative quantum metrology in manybody systems of identical particles

作者：Benatti F^*; Alipour S; Rezakhani A T

来源：New Journal of Physics, 2014, 16(1): 015023.

DOI：10.1088/1367-2630/16/1/015023

Estimation of physical parameters is essential in almost any part of science and technology. The enhancement of performance in this task (e. g. beating the standard classical shot-noise limit) using available physical resources is a major goal in metrology. Quantum metrology in closed systems has indicated that entanglement in such systems may be a useful resource. However, whether in open quantum systems such enhancements may still show up is not yet fully understood. Here, we consider a dissipative (open) quantum system of identical particles in which a parameter of the open dynamics itself is to be estimated. We employ a recently developed dissipative quantum metrology framework, and investigate whether the entanglement produced in the course of the dissipative dynamics may help the estimation task. Specifically, we show that, even in a Markovian dynamics in which states become less distinguishable in time, at small enough times the entanglement generated by the dynamics may offer some advantage over the classical shot-noise limit.

• 出版日期2014-1-17