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Erschienen in: Quantum Information Processing 2/2017

01.02.2017

Biseparability of noisy pseudopure, W and GHZ states using conditional quantum relative Tsallis entropy

verfasst von: Anantha S. Nayak, Sudha, A. R. Usha Devi, A. K. Rajagopal

Erschienen in: Quantum Information Processing | Ausgabe 2/2017

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Abstract

We employ the conditional version of sandwiched Tsallis relative entropy to determine \(1:N-1\) separability range in the noisy one-parameter families of pseudopure and Werner-like N-qubit W, GHZ states. The range of the noisy parameter, for which the conditional sandwiched Tsallis relative entropy is positive, reveals perfect agreement with the necessary and sufficient criteria for separability in the \(1:N-1\) partition of these one parameter noisy states.

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Fußnoten
1
Note that both PP and Werner-like noisy one parameter family of states considered here are not permutation symmetric states, as they do not get restricted only to the \(N+1\) dimensional symmetric subspace of the \(2^N\) Hilbert space of N-qubits. This is because the completely random state \(I_2^{\otimes N}/2^N\) (which is mixed with the pure symmetric N-qubit states in \(\rho ^{\mathrm{PP}}_{\mathrm{W}_N}(x), \rho ^{\mathrm{PP}}_{\mathrm{GHZ}_N}(x), \rho _{\mathrm{W}_{N}} (x), \rho _{\mathrm{GHZ}_{N}}(x)\)) is not confined to the \(N+1\) dimensional subspace of permutation symmetric N-qubit states. In Refs. [19, 20] noisy one parameter families of symmetric N-qubit states were investigated using AR- and CSTRE criteria.
 
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Metadaten
Titel
Biseparability of noisy pseudopure, W and GHZ states using conditional quantum relative Tsallis entropy
verfasst von
Anantha S. Nayak
Sudha
A. R. Usha Devi
A. K. Rajagopal
Publikationsdatum
01.02.2017
Verlag
Springer US
Erschienen in
Quantum Information Processing / Ausgabe 2/2017
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-016-1491-9

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