Implementation of projective measurements with linear optics and continuous photon counting

Details Implementation of projective measurements with linear optics and continuous photon counting Implementation of projective measurements with linear optics and continuous photon counting

2004-10-18

arxiv.org/abs/quant-ph/0410133v2

Phys. Rev. A 71, 022318 (2005)

Physics

Quantum Physics

11 pages, 2 figures, updated to the published version

Scientific paper

10.1103/PhysRevA.71.022318

We investigate the possibility of implementing a given projection measurement using linear optics and arbitrarily fast feedforward based on the continuous detection of photons. In particular, we systematically derive the so-called Dolinar scheme that achieves the minimum error discrimination of binary coherent states. Moreover, we show that the Dolinar-type approach can also be applied to projection measurements in the regime of photonic-qubit signals. Our results demonstrate that for implementing a projection measurement with linear optics, in principle, unit success probability may be approached even without the use of expensive entangled auxiliary states, as they are needed in all known (near-)deterministic linear-optics proposals.

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