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Macroscopic Greenberger-Horne-Zeilinger and W States in Flux Qubits

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 considered theoretically 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.

preprint2008arXivOpen access
Mun Dae KimSam Young Cho
cond-mat.mes-hallcond-mat.supr-con
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Mun Dae KimSam Young Cho

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