Quantum-optical state engineering up to the two-photon level

Details Quantum-optical state engineering up to the two-photon level Quantum-optical state engineering up to the two-photon level

2009-08-28

arxiv.org/abs/0908.4113v1

Nature Photonics 4, 243 - 247 (2010)

Physics

Quantum Physics

Scientific paper

We propose and experimentally verify a scheme to engineer arbitrary states of traveling light field up to the two-photon level. The desired state is remotely prepared in the signal channel of spontaneous parametric down-conversion by means of conditional measurements on the idler channel. The measurement consists of bringing the idler field into interference with two ancilla coherent states, followed by two single-photon detectors, which, in coincidence, herald the preparation event. By varying the amplitudes and phases of the ancillae, we can prepare any arbitrary superposition of zero- one- and two-photon states.

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