
arXiv: 1701.05051
Recently, the basic concept of quantum coherence (or superposition) has gained a lot of renewed attention, after Baumgratz et al. ( Phys. Rev. Lett. 113 , 140401. (doi:10.1103/PhysRevLett.113.140401)), following Åberg ( http://arxiv.org/abs/quant-ph/0612146 ), have proposed a resource theoretic approach to quantify it. This has resulted in a large number of papers and preprints exploring various coherence monotones, and debating possible forms for the resource theory. Here, we take the view that the operational foundation of coherence in a state, be it quantum or otherwise wave mechanical, lies in the observation of interference effects. Our approach here is to consider an idealized multi-path interferometer, with a suitable detector, in such a way that the visibility of the interference pattern provides a quantitative expression of the amount of coherence in a given probe state. We present a general framework of deriving coherence measures from visibility, and demonstrate it by analysing several concrete visibility parameters, recovering some known coherence measures and obtaining some new ones.
Quantum Physics, Electromagnetic theory (general), quantum coherence, interferometer, Quantum coherence, entanglement, quantum correlations, FOS: Physical sciences, visibility, Quantum Physics (quant-ph)
Quantum Physics, Electromagnetic theory (general), quantum coherence, interferometer, Quantum coherence, entanglement, quantum correlations, FOS: Physical sciences, visibility, Quantum Physics (quant-ph)
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