Quantum Fisher and skew information for Unruh accelerated Dirac qubit

The European Physical Journal C

S. Omkar¹  Subhashish Banerjee²  Ashutosh Kumar Alok² 

[1] Indian Institute of Science Education and Research, Thiruvananthapuram, India;Indian Institute of Technology Jodhpur, 342011, Jodhpur, India;

关键词: Fisher Information;    External Noise;    Open Quantum System;    Noisy Channel;    Quantum Fisher Information;   

DOI  :  10.1140/epjc/s10052-016-4290-7

来源: Springer

【 摘 要 】

We develop a Bloch vector representation of the Unruh channel for a Dirac field mode. This is used to provide a unified, analytical treatment of quantum Fisher and skew information for a qubit subjected to the Unruh channel, both in its pure form as well as in the presence of experimentally relevant external noise channels. The time evolution of Fisher and skew information is studied along with the impact of external environment parameters such as temperature and squeezing. The external noises are modelled by both purely dephasing phase damping and the squeezed generalised amplitude damping channels. An interesting interplay between the external reservoir temperature and squeezing on the Fisher and skew information is observed, in particular, for the action of the squeezed generalised amplitude damping channel. It is seen that for some regimes, squeezing can enhance the quantum information against the deteriorating influence of the ambient environment. Similar features are also observed for the analogous study of skew information, highlighting a similar origin of the Fisher and skew information.

【 授权许可】

CC BY