Coherence measures in the strictly incoherent operation framework and its application in the multi-path interferometer
Quantifying coherence is an essential endeavor in both quantum foundations and quantum technologies. In this paper, we study the coherence measures in terms of the diagonal states in the strictly incoherent operations framework. Specifically, we propose a coherence measure in terms of fidelity and provide its analytical expression. The relations between the proposed coherence measure and some other coherence measures are derived. Furthermore, we prove its monotonicity under incoherent operations. As an application, we explore the role of the proposed coherence measure in characterizing the waveness in the multi-path interferometer. As a result, some wave-particle dualities in terms of fidelity are presented. This work not only deepens the interpretation of the diagonal states on characterizing quantum states, but also promotes the quantitative description of the wave-particle behaviors in the multi-path interferometer.