A new coherence measure based on fidelity
| Autor: | C. L. Liu, Longjiang Liu, Da-Jian Zhang, Qi-Ming Ding, Xiao-Dong Yu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Computer science
media_common.quotation_subject Measure (physics) Fidelity FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Theoretical Computer Science 0103 physical sciences Statistical physics Electrical and Electronic Engineering 010306 general physics Quantum Quantum computer media_common Quantum Physics Statistical and Nonlinear Physics Coherence (statistics) State (functional analysis) Electronic Optical and Magnetic Materials Quantum technology Modeling and Simulation Qubit Signal Processing Quantum Physics (quant-ph) |
| Popis: | 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 [T. Baumgratz, M. Cramer, and M. B. Plenio, 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. 10 pages |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|