Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevLett.111.190501
Title: Detecting and estimating continuous-variable entanglement by local orthogonal observables
Authors: Zhang, C. 
Yu, S. 
Chen, Q.
Oh, C.H. 
Issue Date: 4-Nov-2013
Source: Zhang, C., Yu, S., Chen, Q., Oh, C.H. (2013-11-04). Detecting and estimating continuous-variable entanglement by local orthogonal observables. Physical Review Letters 111 (19) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevLett.111.190501
Abstract: Entanglement detection and estimation are fundamental problems in quantum information science. Compared with discrete-variable states, for which lots of efficient entanglement detection criteria and lower bounds of entanglement measures have been proposed, the continuous-variable entanglement is much less understood. Here we shall present a family of entanglement witnesses based on continuous-variable local orthogonal observables (CVLOOs) to detect and estimate entanglement of Gaussian and non-Gaussian states, especially for bound entangled states. By choosing an optimal set of CVLOOs, our entanglement witness is equivalent to the realignment criterion and can be used to detect bound entanglement of a class of 2+2 mode Gaussian states. Via our entanglement witness, lower bounds of two typical entanglement measures for arbitrary two-mode continuous-variable states are provided. © 2013 American Physical Society.
Source Title: Physical Review Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/116286
ISSN: 00319007
DOI: 10.1103/PhysRevLett.111.190501
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