Entanglement resource theory of quantum channel

Abstract

Quantum channels can represent dynamic resources, which are indispensable elements in many physical scenarios. To describe certain facets of nonclassicality of the channels, it is necessary to quantify their properties. In the framework of resource theory of quantum channel, we show two general ways of constructing entanglement measure of channels. We also present several entanglement measures of channels based on the Choi relative entropy of channels, concurrence and k-ME concurrence and give some specific examples. These entanglement measures of channels can deepen the cognizing about channel and advance the research on the transformation between coherent resources and entangled resources. In addition, we prove that these measures satisfy the properties including nonnegativity, monotonicity, convexity and so on.

Detecting entanglement of quantum channels

“…Conventional entanglement theory focuses on the nonlocal correlation of quantum states, and quantum channels are used as their manipulation tool. Recent works have shown that quantum channel itself could be regarded as the resource object [17][18][19][20][21][22] and the entanglement of channels has be studied under the framework of quantum resource theories [23][24][25][26][27][28]. Analog to quantum states, quantum channels are also categorized into entangled and separable ones, with the amount of entanglement quantified via channel entanglement measures [23][24][25].…”