MiS Preprint Repository

Quantifying coherence is an essential endeavor for both quantum mechanical foundations and quantum technologies. We present a bona fide measure of quantum coherence by utilizing the Tsallis relative operator $(\alpha ,\beta )$-entropy. We first prove that the proposed coherence measure fulfills all the criteria of a well defined coherence measure, including the strong monotonicity in the resource theories of quantum coherence. We then study the ordering of the Tsallis relative operator $(\alpha ,\beta )$-entropy of coherence, Tsallis relative $\alpha$-entropies of coherence, Rényi $\alpha$-entropy of coherence and $l_1$ norm of coherence for both pure and mixed qubit states.

This provides a new method for defining new coherence measure and entanglement measure, and also provides a new idea for further study of quantum coherence.