Entanglement and Collective Quantum Operations

Details Entanglement and Collective Quantum Operations Entanglement and Collective Quantum Operations

2000-03-16

arxiv.org/abs/quant-ph/0003062v3

Physics

Quantum Physics

Scientific paper

10.1016/S0375-9601(00)00461-8

We show how shared entanglement, together with classical communication and local quantum operations, can be used to perform an arbitrary collective quantum operation upon N spatially-separated qubits. A simple teleportation-based protocol for achieving this, which requires 2(N-1) ebits of shared, bipartite entanglement and 4(N-1) classical bits, is proposed. In terms of the total required entanglement, this protocol is shown to be optimal for even N in both the asymptotic limit and for `one-shot' applications.

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