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2020

Consequences of preserving reversibility in quantum superchannels

Yokojima, Wataru, Quintino, Marco Túlio, Soeda, Akihito et al.

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Similarly to quantum states, quantum operations can also be transformed by means of quantum superchannels, also known as process matrices.

Quantum superchannels with multiple slots are deterministic transformations whichtake independent quantum operations as inputs.
While they are enforced to respect the laws of quantum mechanics, the use of input operations may lack a definite causal order, and characterizations of general superchannels in terms of quantum objects with a physical implementation have been missing.
In this paper, we provide a mathematical characterization for pure superchannels with two slots (also known as bipartite pure processes), which are superchannels preserving the reversibility of quantum operations.

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