Conditioned Unitary Transformation on biphotons

Details Conditioned Unitary Transformation on biphotons Conditioned Unitary Transformation on biphotons

2003-12-29

arxiv.org/abs/quant-ph/0312211v2

Phys. Rev. A 70 (2004) 032332

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.70.032332

A conditioned unitary transformation ($90^o$ polarization rotation) is performed at single-photon level. The transformation is realized by rotating polarization for one of the photons of a polarization-entangled biphoton state (signal photon) by means of a Pockel's cell triggered by the detection of the other (idler) photon after polarization selection. As a result, polarization degree for the signal beam changes from zero to the value given by the idler detector quantum efficiency. This result is relevant to practical realization of various quantum information schemes and can be used for developing a new method of absolute quantum efficiency calibration.

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