title: Gaussian entanglement generation from coherence using beam-splitters.
abstract: The generation and quantification of quantum entanglement is crucial for quantum information processing. Here we study the transition of Gaussian correlation under the effect of linear optical beam-splitters. We find the single-mode Gaussian coherence acts as the resource in generating Gaussian entanglement for two squeezed states as the input states. With the help of consecutive beam-splitters, single-mode coherence and quantum entanglement can be converted to each other. Our results reveal that by using finite number of beam-splitters, it is possible to extract all the entanglement from the single-mode coherence even if the entanglement is wiped out before each beam-splitter.
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China.
authors.forename: Zhong-Xiao
authors.initials: ZX
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
authors.forename: Shuhao
authors.initials: S
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
authors.forename: Teng
authors.initials: T
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China.
authors.forename: Tie-Jun
authors.initials: TJ
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China.
authors.forename: Chuan
authors.initials: C
authors.lastname: Wang