Nonlinear optics with less than one photon

Details Nonlinear optics with less than one photon Nonlinear optics with less than one photon

2001-01-04

arxiv.org/abs/quant-ph/0101020v1

Physical Review Letters 87, 123603 (2001).

Physics

Quantum Physics

8 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.87.123603

We demonstrate suppression and enhancement of spontaneous parametric down- conversion via quantum interference with two weak fields from a local oscillator (LO). Pairs of LO photons are observed to upconvert with high efficiency for appropriate phase settings, exhibiting an effective nonlinearity enhanced by at least 10 orders of magnitude. This constitutes a two-photon switch, and promises to be useful for a variety of nonlinear optical effects at the quantum level.

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