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

Abstract

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.

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

References in corpus (7)

• Decoherence of flux qubits due to 1/f flux noise
• Dephasing of a superconducting qubit induced by photon noise
• Spectroscopy on two coupled flux qubits
• Controllable coupling of superconducting flux qubits
• Switchable resonant coupling of flux qubits
• Controllable Coupling in Phase-Coupled Flux Qubits
• Entanglement and Bell States in Superconducting Flux Qubits

Cited by in corpus (11)

• Circuit Quantum Electrodynamics
• Microwave photonics with superconducting quantum circuits
• Proposal for generating and detecting multi-qubit GHZ states in circuit QED
• One-step multi-qubit GHZ state generation in a circuit QED system
• Tripartite interactions between two phase qubits and a resonant cavity
• Fast generation of multiparticle entangled state for flux qubits in a circle array of transmission line resonators with tunable coupling
• Greenberger-Horne-Zeilinger States in Quantum Dot Molecule
• Entanglement Property and Monogamy Relation of Gerneralized Mixed W
• Generation of two-photon EPR and Wstates
• Coupling qubits in circuit-QED cavities connected by a bridge qubit
• Macroscopic Many-Qubit Interactions in Superconducting Flux Qubits