Physics – Quantum Physics
Scientific paper
2003-09-19
Phys. Rev. A 69, 031806(R) (2004)
Physics
Quantum Physics
4 pages, 1 figure
Scientific paper
10.1103/PhysRevA.69.031806
In practice, single photons are generated as a mixture of vacuum with a single photon with weights 1-p and p, respectively; here we are concerned with increasing p by directing multiple copies of the single photon-vacuum mixture into a linear optic device and applying photodetection on some outputs to conditionally prepare single photon states with larger p. We prove that it is impossible, under certain conditions, to increase p via linear optics and conditional preparation based on photodetection, and we also establish a class of photodetection events for which p can be improved. In addition we prove that it is not possible to obtain perfect (p=1) single photon states via this method from imperfect (p<1) inputs.
Berry Dominic W.
Knight Peter L.
Sanders Barry C.
Scheel Stefan
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