Conditioned Unitary Transformation on biphotons

Abstract

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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Cited by in corpus (7)

• Research on Hidden Variable Theories: a review of recent progresses
• Demonstration of Quantum Error Correction using Linear Optics
• Twin-photon techniques for photo-detector calibration
• The possibility of absolute calibration of analog detectors by using parametric down-conversion: a systematical study
• On multiparticle W states, their implementations and applications in quantum information problems
• Analysis of the possibility of analog detectors calibration by exploiting Stimulated Parametric Down Conversion
• Absolute calibration of Analog Detectors using Stimulated Parametric Down Conversion