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

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

2007-05-28

arxiv.org/abs/0705.3991v2

Phys. Rev. B 77, 100508(R) (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, version to appear in Phys. Rev. B (Rapid Comm.)

Scientific paper

10.1103/PhysRevB.77.100508

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.

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