Document Detail

Characterizing multiparticle entanglement in symmetric N-qubit states via negativity of covariance matrices.
MedLine Citation:
PMID:  17358923     Owner:  NLM     Status:  PubMed-not-MEDLINE    
We show that higher order intergroup covariances involving even number of qubits are necessarily positive semidefinite for N-qubit separable states, which are completely symmetric under permutations of the qubits. This identification leads to a family of sufficient conditions of inseparability based on the negativity of 2kth order intergroup covariance matrices (2k</=N) of symmetric N-qubit systems. These conditions have a simple structure and detect entanglement in all even partitions of the symmetric multiqubit system. The observables involved are feasible experimental quantities and do not demand full state determination through quantum state tomography.
A R Usha Devi; R Prabhu; A K Rajagopal
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Publication Detail:
Type:  Journal Article     Date:  2007-02-05
Journal Detail:
Title:  Physical review letters     Volume:  98     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-03-15     Completed Date:  2007-06-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  060501     Citation Subset:  -    
Department of Physics, Bangalore University, Bangalore-560 056, India.
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