Efficient implementation of bipartite nonlocal unitary gates using prior entanglement and classical communication

Physics – Quantum Physics

Scientific paper

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Minor corrections so as to agree with the published version

Scientific paper

10.1103/PhysRevA.81.062315

Any bipartite nonlocal unitary operation can be carried out by teleporting a quantum state from one party to the other, performing the unitary gate locally, and teleporting a state back again. This paper investigates unitaries which can be carried out using less prior entanglement and classical communication than are needed for teleportation. Large families of such unitaries are constructed using (projective) representations of finite groups. Among the tools employed are: a diagrammatic approach for representing entangled states, a theorem on the necessary absence of information at certain times and locations, and a representation of bipartite unitaries based on a group Fourier transform.

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