Quantifying environmental memory degree from the aspect of environmental sensitivity

An intuitive and natural way to quantify memory effects through measures on a probe quantum system is given from the aspect of sensitivity of environmental state. After several measures on the probe system, the degree of memory effects is given by the maximum distinguishability of output states of p...

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Bibliographic Details
Published in:Quantum information processing 2021-02, Vol.20 (2), Article 77
Main Author: Jin, Yao
Format: Article
Language:English
Subjects:
Data Structures and Information Theory
Evolution
Fisher information
Mathematical Physics
Parameter estimation
Physics
Physics and Astronomy
Quantum Computing
Quantum Information Technology
Quantum Physics
Quantum theory
Sensitivity
Spintronics
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Summary:An intuitive and natural way to quantify memory effects through measures on a probe quantum system is given from the aspect of sensitivity of environmental state. After several measures on the probe system, the degree of memory effects is given by the maximum distinguishability of output states of probe system corresponding to the variation of past evolution time. Quantum Fisher information on the past evolution duration which reflects the sensitivity of environmental state with respect to the system–environment evolution duration becomes the characteristic parameter of memory degree. The estimation process is applied on both classical and quantum environments, and the memory degree from the aspect of sensitivity of environmental state reflects the memory speed of environment.
ISSN:1570-0755
1573-1332
DOI:10.1007/s11128-021-03020-4