Macroscopic Greenberger-Horne-Zeilinger and W states in flux qubits

被引：24

作者：

Kim, Mun Dae ^{[1
]}

Cho, Sam Young ^{[2
,3
,4
]}

机构：

[1] Korea Inst Adv Study, Seoul 130722, South Korea

[2] Chongqing Univ, Ctr Modern Phys, Chongqing 400044, Peoples R China

[3] Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China

[4] Univ Queensland, Dept Phys, Brisbane, Qld 4072, Australia

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.77.100508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate two types of genuine three-qubit entanglement, known as the Greenberger-Horne-Zeilinger (GHZ) and W states, in a macroscopic quantum system. Superconducting flux qubits are theoretically considered in order to generate such states. A phase coupling is proposed to offer enough strength of interactions between qubits. While an excited state can be the W state, the GHZ state is formed at the ground state of the three flux qubits. The GHZ and W states are shown to be robust against external flux fluctuations for feasible experimental realizations.

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页数：4

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