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Phys Rev Lett. 2005 Jul 15;95(3):030505. Epub 2005 Jul 13.

Repeat-until-success linear optics distributed quantum computing.

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  • 1Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BZ, United Kingdom.


We demonstrate the possibility to perform distributed quantum computing using only single-photon sources (atom-cavity-like systems), linear optics, and photon detectors. The qubits are encoded in stable ground states of the sources. To implement a universal two-qubit gate, two photons should be generated simultaneously and pass through a linear optics network, where a measurement is performed on them. Gate operations can be repeated until a success is heralded without destroying the qubits at any stage of the operation. In contrast with other schemes, this does not require explicit qubit-qubit interactions, a priori entangled ancillas, nor the feeding of photons into photon sources.

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