Physics – Quantum Physics
Scientific paper
2011-11-24
Phys. Rev. B 85, 024537(2012)
Physics
Quantum Physics
10 pages 5 figures
Scientific paper
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.
Liu Yu-xi
Nakamura Yoshifumi
Peng Zhi-Hui
Tsai Jaw-Shen
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