Time reversal and exchange symmetries of unitary gate capacities

Details Time reversal and exchange symmetries of unitary gate capacities Time reversal and exchange symmetries of unitary gate capacities

2005-11-22

arxiv.org/abs/quant-ph/0511219v3

IEEE Trans. Inf. Th., vol. 56, no. 1, pp. 462-475, 2010

Physics

Quantum Physics

17 pages. v2: improved bounds, clarified proofs. v3: published version, added section explaining notation

Scientific paper

Unitary gates are an interesting resource for quantum communication in part because they are always invertible and are intrinsically bidirectional. This paper explores these two symmetries: time-reversal and exchange of Alice and Bob. We will present examples of unitary gates that exhibit dramatic separations between forward and backward capacities (even when the back communication is assisted by free entanglement) and between entanglement-assisted and unassisted capacities, among many others. Along the way, we will give a general time-reversal rule for relating the capacities of a unitary gate and its inverse that will explain why previous attempts at finding asymmetric capacities failed. Finally, we will see how the ability to erase quantum information and destroy entanglement can be a valuable resource for quantum communication.

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