Conditional unitary transformation on biphotons

Brida, G; Chekhova, MV; Genovese, M; Gramegna, M; Krivitsky, LA; Kulik, SP

doi:10.1103/PhysRevA.70.032332

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Conditional unitary transformation on biphotons

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Brida, G., Chekhova, M., Genovese, M., Gramegna, M., Krivitsky, L., & Kulik, S. (2004). Conditional unitary transformation on biphotons. PHYSICAL REVIEW A, 70(3): 032332. doi:10.1103/PhysRevA.70.032332.

Cite as: https://hdl.handle.net/21.11116/0000-0001-DF86-D

Abstract

A conditional unitary transformation (90degrees 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 cell triggered by the detection of the other (idler) photon after polarization selection. As a result, the state of the signal photon is losslessly changed from being completely unpolarized to being partially polarized, so that the final polarization degree is given by the idler detector quantum efficiency. This experiment can be used for developing a different method of absolute quantum efficiency calibration.