Highly entangled ground states in tripartite qubit systems

Beat Röthlisberger; Jörg Lehmann; D. S. Saraga; Philipp Traber; Daniel Loss

doi:10.1103/PhysRevLett.100.100502

Highly entangled ground states in tripartite qubit systems

Beat Röthlisberger^*
, Jörg Lehmann
, D. S. Saraga
, Philipp Traber
, Daniel Loss

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

We investigate the creation of highly entangled ground states in a system of three exchange-coupled qubits arranged in a ring geometry. Suitable magnetic field configurations yielding approximate Greenberger-Horne-Zeilinger and exact W ground states are identified. The entanglement in the system is studied at finite temperature in terms of the mixed-state tangle τ. By generalizing a conjugate gradient optimization algorithm originally developed to evaluate the entanglement of formation, we demonstrate that τ can be calculated efficiently and with high precision. We identify the parameter regime for which the equilibrium entanglement of the tripartite system reaches its maximum.

Original language	English
Article number	100502
Journal	Physical Review Letters
Volume	100
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.100.100502
State	Published - 14 Mar 2008
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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abstract = "We investigate the creation of highly entangled ground states in a system of three exchange-coupled qubits arranged in a ring geometry. Suitable magnetic field configurations yielding approximate Greenberger-Horne-Zeilinger and exact W ground states are identified. The entanglement in the system is studied at finite temperature in terms of the mixed-state tangle τ. By generalizing a conjugate gradient optimization algorithm originally developed to evaluate the entanglement of formation, we demonstrate that τ can be calculated efficiently and with high precision. We identify the parameter regime for which the equilibrium entanglement of the tripartite system reaches its maximum.",

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Highly entangled ground states in tripartite qubit systems

Abstract

ASJC Scopus subject areas

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