Optical qubit by conditional interferometry

Details Optical qubit by conditional interferometry Optical qubit by conditional interferometry

1999-09-24

arxiv.org/abs/quant-ph/9909075v1

Phys. Rev. A. vol 62, 033813 (2000)

Physics

Quantum Physics

RevTeX, 4 pictures (6 ps-files). Web contact at http://enterprise.pv.infn.it/~paris

Scientific paper

10.1103/PhysRevA.62.033813

We suggest a method to prepare any chosen superposition a0 |0> + a1 |1> of the vacuum and one-photon states. The method is based on a conditional double-interferometer fed by an one-photon state and a coherent state. The scheme involves only linear optical elements and avalanche photodetectors, and therefore it should be realizable with current technology. A realistic description of the triggering photodetectors is employed, i.e. we assume that they can only check, with a certain efficiency, whether or not any photon is present. We discuss two working regimes, and show that output states with fidelity arbitrarily close to unit may be obtained, with non vanishing conditional probability, also for low quantum efficiency at the photodetectors.

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