Fiber-based entangled photon-pair generation

罗思行 Luo Sixing, 姚立 Yao Li, 杨伯君 Yang Bojun

Hiroki Takesue

I report the first experiment on 1.5-mum band entanglement generation in a cooled fiber. Low-noise time-bin entangled photon pairs were successfully generated and distributed over 60 km of fiber with a raw visibility of 76%.

Krishna Thyagarajan

Eric Y. Zhu, Li Qian, Costantino Corbari +2 more

We discuss the various aspects of polarization-entangled photon pair generation in a poled fiber, including the role that fiber birefringence and dispersion play. The broadband nature of the fiber source is demonstrated, and the downconversion spectrum is measured.

Kim F. Lee

Abstract : SEE REPORTWe generate high-purity correlated and entangled photon-pairs at the telecom wavelengths in a cooled 10-meter highly nonlinear fiber (HNLF). In our previous project (contract no: FA8750-12-1-0136), we were able to generate correlated/entangled photon-pair using the highly nonlinear fiber in a counter-propagating scheme (CPS). With the HNLF at room temperature, we obtain coincidence-to-accidental ratio (CAR) 26-30 and two-photon interference with visibility 92%-93%. This is the best performance compared to the reported results in the literature on HNLF and Photonic Crystal Fiber (PCF) at telecom wavelengths. Unlike the PCF or microstructure fiber, the HNLF can be cooled at liquid nitrogen temperatures (77K) to suppress Raman photons. By cooling the HNLF, we expect to obtain a CAR 130 and two-photon interference with visibility 98%. We will verify the non-local behavior of high-purity HNLF-based entangled photon-pairs by making Bell s Inequalities measurements. We investigate the effect of multiple scattering on the telecom wavelength photon-pair. Our findings show that quantum correlation of polarization-entangled photon-pairs is better preserved than polarization-correlated photon-pairs in multiple scattering processes.

Stefanie Barz, G. Cronenberg, Anton Zeilinger +1 more