Macroscopic Greenberger-Horne-Zeilinger and W states in flux qubits
Macroscopic Greenberger-Horne-Zeilinger and W states in flux qubits
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DOI：
10.1103/physrevb.77.100508
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
M. Kim;Sam Young Cho
中科院分区：
文献类型：
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作者：
M. Kim;Sam Young Cho
我们研究了两种类型的真正的三量子比特纠缠，称为格林伯格-霍恩-蔡林格（GHZ）和W态，在宏观量子系统。理论上考虑超导磁通量子比特，以产生这样的状态。提出了相位耦合来提供量子位之间足够的相互作用强度。虽然激发态可以是W态，但GHZ态在三个通量量子比特的基态处形成。GHZ和W状态被证明是强大的对外部磁通量波动的可行的实验实现。
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.