Research On Coherence And Coherence

Resource theory is a branch of quantum information science,which regards the traits of quantum physics as a physical resource,and study it quantitatively.Re-source theory of coherence is a new developed resource theory.Within the frame-work of resource theory of coherence,cohering power and decohering power are two quantities that describe the character of quantum operation.In this paper,we study the cohering power of the c-q quantum operation,defined the l1 norm co-herence of quantum operation,and calculated the l1 norm coherence of single qubit unitary operation especially.And finally,we study the the sum of coherence of two pure qubit states in arbitrary orthonormal basis.