Coherence arises from the superposition principle and plays a key role in
quantum mechanics. Recently, Baumgratz et al. [T. Baumgratz, M. Cramer, and M.
B. Plenio, Phys. Rev. Lett. 113, 140401 (2014)] established a rigorous
framework for quantifying the coherence of finite dimensional quantum states.
In this work we provide a framework for quantifying the coherence of Gaussian
states and explicitly give a coherence measure based on the relative entropy.Comment: 6 pages,no figur