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Quantum Information Processing

Characterization of classical static noise via qubit as probe

  • 01-03-2018
Published in:
Authors
Muhammad Javed
Salman Khan
Sayed Arif Ullah
Published in
Quantum Information Processing | Issue 3/2018

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Abstract

The dynamics of quantum Fisher information (QFI) of a single qubit coupled to classical static noise is investigated. The analytical relation for QFI fixes the optimal initial state of the qubit that maximizes it. An approximate limit for the time of coupling that leads to physically useful results is identified. Moreover, using the approach of quantum estimation theory and the analytical relation for QFI, the qubit is used as a probe to precisely estimate the disordered parameter of the environment. Relation for optimal interaction time with the environment is obtained, and condition for the optimal measurement of the noise parameter of the environment is given. It is shown that all values, in the mentioned range, of the noise parameter are estimable with equal precision. A comparison of our results with the previous studies in different classical environments is made.

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Title
Characterization of classical static noise via qubit as probe
Authors
Muhammad Javed
Salman Khan
Sayed Arif Ullah
Publication date
01-03-2018
Publisher
Springer US
Published in
Quantum Information Processing / Issue 3/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-018-1817-x
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