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Journal Article

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


Jain,  Nitin
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Bimbard, E., Jain, N., MacRae, A., & Lvovsky, A. I. (2010). Quantum-optical state engineering up to the two-photon level. NATURE PHOTONICS, 4(4), 243-247. doi:10.1038/NPHOTON.2010.6.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6B15-0
The ability to prepare arbitrary quantum states within a certain Hilbert space is the holy grail of quantum information technology. It is particularly important for light, as this is the only physical system that can communicate quantum information over long distances. We propose and experimentally verify a scheme to produce arbitrary single-mode states of a travelling 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.