Near-Deterministic Discrimination of All Bell States with Linear Optics

Details Near-Deterministic Discrimination of All Bell States with Linear Optics Near-Deterministic Discrimination of All Bell States with Linear Optics

2011-11-18

arxiv.org/abs/1111.4273v2

Physical Review Letters, 107, 080403 (2011); Erratum, Physical Review Letters, 107, 219901 (2011)

Physics

Quantum Physics

4 pages, 2 figures, 1 table, merged version of the original Phys. Rev. Lett. 107, 080403 (2011) (DOI: 10.1103/PhysRevLett.107.

Scientific paper

10.1103/PhysRevLett.107.219901

For a reliable implementation of quantum teleportation, a near-deterministic (close to 100%) discrimination of all four Bell states of entangled qubits is required. One can carry it out with linear optical elements only if conditional dynamics are allowed. Here we present a setup in which we repeatedly disentangle and re-entangle photons in three of four states, so as to separate photons in two of them, conditioned on keeping the third one at bay. The efficiency of a realistic implementation of our setup with current technology is over 90% for an ideal source of photons on demand.

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