← Back to papers
A new coherence measure based on fidelity
C. Liu, Da-Jian Zhang, Da-Jian Zhang, Xiao-Dong Yu, Q. Ding, Longjiang Liu·June 24, 2017·DOI: 10.1007/s11128-017-1650-7
PhysicsComputer Science
AI Breakdown
Get a structured breakdown of this paper — what it's about, the core idea, and key takeaways for the field.
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.