Ancilla models for quantum operations: For what unitaries does the ancilla state have to be physical?

Details Ancilla models for quantum operations: For what unitaries does the ancilla state have to be physical? Ancilla models for quantum operations: For what unitaries does the ancilla state have to be physical?

2012-03-20

arxiv.org/abs/1203.4585v1

Physics

Quantum Physics

Scientific paper

Any evolution described by a completely positive trace-preserving linear map can be imagined as arising from the interaction of the evolving system with an initially uncorrelated ancilla. The interaction is given by a joint unitary operator, acting on the system and the ancilla. Here we study the properties such a unitary operator must have in order to force the choice of a physical- that is, positive-state for the ancilla if the end result is to be a physical-that is, completely positive-evolution of the system.

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