A new coherence measure based on fidelity
Abstract
Quantifying coherence is an essential endeavor for both quantum foundations and quantum technologies. In this paper, we put forward a quantitative measure of coherence by following the axiomatic definition of coherence measures introduced in Baumgratz et al. (Phys Rev Lett 113:140401, 2014). Our measure is based on fidelity and analytically computable for arbitrary states of a qubit. As one of its applications, we show that our measure can be used to examine whether a pure qubit state can be transformed into another pure or mixed qubit state only by incoherent operations.
- Publication:
-
Quantum Information Processing
- Pub Date:
- August 2017
- DOI:
- 10.1007/s11128-017-1650-7
- arXiv:
- arXiv:1706.07941
- Bibcode:
- 2017QuIP...16..198L
- Keywords:
-
- Quantifying coherence;
- Coherence measure;
- Fidelity;
- Qubit states;
- Quantum Physics
- E-Print:
- 10 pages