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Quantum Computation by Communication

Spiller, Timothy P.; Nemoto, Kae; Braunstein, Samuel L.; Munro, William J.; van Loock, Peter; Milburn, Gerard J.


Keyword(s): quantum computation; continuous variables; distributed information processing

Abstract: We present a new approach to scalable quantum computing -a "qubus computer"- which realises qubit measurement and quantum gates through interacting qubits with a quantum communication bus mode. The qubits could be "static" matter qubits or "flying" optical qubits, but the scheme we focus on here is particularly suited to matter qubits. There is no requirement for direct interaction between the qubits. Universal two-qubit quantum gates may be effected by schemes which involve measurement of the bus mode, or by schemes where the bus disentangles automatically and no measurement is needed. In effect, the approach integrates together qubit degrees of freedom for computation with quantum continuous variables for communication and interaction. Notes: Kae Nemoto and Peter van Loock, National Institute of Informatics, 2- 1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan. Samuel L. Braunstein, Computer Science, University of York, York YO10 5DD, U.K. Gerard J. Milburn, Centre for Quantum Computer Technology, Department of Physics, University of Queensland, Australia.

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