Substituting Quantum Entanglement for Communication

Physics – Quantum Physics

Scientific paper

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4 pages REVTeX, no figures. Minor corrections

Scientific paper

10.1103/PhysRevA.56.1201

We show that quantum entanglement can be used as a substitute for communication when the goal is to compute a function whose input data is distributed among remote parties. Specifically, we show that, for a particular function among three parties (each of which possesses part of the function's input), a prior quantum entanglement enables one of them to learn the value of the function with only two bits of communication occurring among the parties, whereas, without quantum entanglement, three bits of communication are necessary. This result contrasts the well-known fact that quantum entanglement cannot be used to simulate communication among remote parties.

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