Fast generation of multiparticle entangled state for flux qubits in a circle array of transmission line resonators with tunable coupling

Abstract

We study a one-step approach to the fast generation of Greenberger-Horne-Zeilinger (GHZ) states in a circuit QED system with superconducting flux qubits. The GHZ state can be generated in about 10 ns, which is much shorter than the coherence time of flux qubits and comparable with the time of single-qubit operation. In our proposal, a time-dependent microwave field is applied to a superconducting transmission line resonator (TLR) and displaces the resonator in a controlled manner, thus inducing indirect qubit-qubit coupling without residual entanglement between the qubits and the resonator. The design of a tunably coupled TLR circle array provides us with the potential for extending this one-step scheme to the case of many qubits coupled via several TLRs.

10 pages 5 figures

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Cited by in corpus (4)

• Preparing multiparticle entangled states of NV centers via adiabatic ground-state transitions
• Engineering two-mode entangled states between two superconducting resonators by dissipation
• Engineering entangled microwave photon states via multiphoton interactions between two cavity fields and a superconducting qubit
• Coupled modes locally interacting with qubits: critical assessment of the rotating wave approximation