Tunable entanglement distillation of spatially correlated down-converted photons

Abstract

Abstract:We report on a new technique for entanglement distillation of the bipartite continuous variable state of spatially correlated photons generated in the spontaneous parametric downconversion process (SPDC), where tunable non-Gaussian operations are implemented and the post-processed entanglement is certified in real-time using a single-photon sensitive electron multiplying CCD (EMCCD) camera. The local operations are performed using non-Gaussian filters modulated into a programmable spatial light modulator and, by using the EMCCD camera for actively recording the probability distributions of the twin-photons, one has fine control of the Schmidt number of the distilled state. We show that even simple non-Gaussian filters can be finely tuned to a ∼67% net gain of the initial entanglement generated in the SPDC process. 984 (2012). 12. A. Gatti, E. Brambilla, and L. A. Lugiato, "Entangled imaging and wave-particle duality: from the microscopic to the macroscopic realm," Phys. Rev. Lett. 90, 133603 (2003). 13. G. Brida, M. Genovese, and I. Ruo Berchera, "Experimental realization of sub-shot-noise quantum imaging," Nat.

Optimal High-Dimensional Entanglement Concentration for Pure Bipartite Systems

“…This document will refer to simply as entanglement. Another function widely used to assess entanglement is the Schmidt number [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ], defined as It is straightforward to see that and are closely related, as both depend on .…”

“…Another function widely used to assess entanglement is the Schmidt number [44][45][46][47][48][49][50][51], defined as…”