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Quantum switch for coupling highly detuned superconducting qubits
Authors:Ji-kun Xie  Sheng-li Ma  Zhi-peng Yang  Zhen Li  Fu-li Li
Affiliation:Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices and Department of Applied Physics, School of Science, Xi''an Jiaotong University, Xi''an 710049, People''s Republic of China
Abstract:We propose to implement a quantum switch scheme for coupling highly detuned superconducting qubits connected by a gap-tunable bridge qubit. By modulating the frequency of the bridge qubit, it can be used as a coupler to switch on/off and adjust the coupling strength between the initially non-interaction qubits. It is shown that the proposals of quantum information transfer and quantum entangled gate between two highly detuned qubits can be implemented with high fidelity. Moreover, we extend the case of coupling the switch to multiple qubits for the generation of W states. The advantages of our scheme are that it eliminates the need for tuning the gaps of the qubits and the cross-talk interaction is greatly suppressed. The influence of decoherence and parameter variation is also investigated by numerical simulation, which suggests that the present scheme is feasible in current experiment.
Keywords:Superconducting qubit  Quantum state transfer  Quantum entanglement
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