Non-local geometric phase in two-photon interferometry
Laboratoire de Physique de la Matière Condensée - CNRS UMR 6622, Université de Nice - Sophia Antipolis, Parc Valrose, Nice Cedex 2, France, EU
2 Raman Research Institute - Bangalore 560080, India
Accepted: 24 November 2011
We report the experimental observation of the non-local geometric phase in Hanbury Brown-Twiss polarized intensity interferometry. The experiment involves two independent, polarized, incoherent sources, illuminating two polarized detectors. Varying the relative polarization angle between the detectors introduces a geometric phase equal to half the solid angle on the Poincaré sphere traced out by a pair of single photons. Local measurements at either detector do not reveal the effect of the geometric phase, which appears only in the coincidence counts between the two detectors, showing a genuinely non-local effect. We show experimentally that coincidence rates of photon arrival times at separated detectors can be controlled by the two-photon geometric phase. This effect can be used for manipulating and controlling photonic entanglement.
PACS: 03.65.Vf – Phases: geometric; dynamic or topological / 42.50.-p – Quantum optics / 42.50.Ar – Photon statistics and coherence theory
© EPLA, 2012