Entanglement Generation by Fock-State Filtration

作     者：K. J. Resch J. L. O’Brien T. J. Weinhold K. Sanaka B. P. Lanyon N. K. Langford A. G. White 

作者机构：Department of Physics & Centre for Quantum Computer Technology University of Queensland Brisbane QLD 4072 Australia Department of Physics & Institute for Quantum Computing University of Waterloo Waterloo ON N2L 3G1 Canada H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering University of Bristol Bristol BS8 1UB United Kingdom E. L. Ginzton Laboratory Stanford University Stanford California 94305 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2007年第98卷第20期

页      面：203602-203602页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Engineering and Physical Sciences Research Council  EPSRC  (EP/F008023/1) 

主　　题：.nonlinearities blocking nonclassical Quantum Interference photon pairs single photons ancilla quantum state tomography Fock-state filter tangle 

摘      要：We demonstrate a Fock-state filter which is capable of preferentially blocking single photons over photon pairs. The large conditional nonlinearities are based on higher-order quantum interference, using linear optics, an ancilla photon, and measurement. We demonstrate that the filter acts coherently by using it to convert unentangled photon pairs to a path-entangled state. We quantify the degree of entanglement by transforming the path information to polarization information; applying quantum state tomography we measure a tangle of T=(20±9)%.