Journal
PHYSICS LETTERS A
Volume 381, Issue 19, Pages 1670-1676Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2017.03.022
Keywords
Quantum coherence; Quantum operations; Cohering power
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Funding
- Department of Atomic Energy, Government of India
- National Natural Science Foundation of China [11301124, 11171301, 11571307]
- Doctoral Programs Foundation of the Ministry of Education of China [J20130061]
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Quantum coherence and entanglement, which play a crucial role in quantum information processing tasks, are usually fragile under decoherence. Therefore, the production of quantum coherence by quantum operations is important to preserve quantum correlations including entanglement. In this paper, we study cohering power-the ability of quantum operations to produce coherence. First, we provide an operational interpretation of cohering power. Then, we decompose a generic quantum operation into three basic operations, namely, unitary, appending and dismissal operations, and show that the cohering power of any quantum operation is upper bounded by the corresponding unitary operation. Furthermore, we compare cohering power and generalized cohering power of quantum operations for different measures of coherence. (C) 2017 Elsevier B.V. All rights reserved.
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