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International Journal of Theoretical Physics

Generation of N-Qubit W State in N Separated Resonators via Resonant Interaction

Xin Wei, Meifeng Chen

Published Jul 31, 2014• 9 citations
Publisher
DOI
10.1007/s10773-014-2274-7

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This paper explores the dynamics of two spatially separated superconducting flux qubits, initially in a maximally correlated state, without mutual interaction. The system is modeled using the master intrinsic decoherence equation with the flux-qubits-resonator interaction Hamiltonian. The effects of initial state, detuning, and decoherence on the generated oscillatory correlation dynamics and the sudden death-birth phenomenon of the two flux-qubits entanglement are examined. The results demonstrate that qubit-resonator-qubit interactions have a high ability to generate quantum interferometric power and local quantum uncertainty correlations beyond that of concurrence entanglement.
We propose a quantum reservoir engineering approach for stabilizing Bell states of two superconducting qubits. The system under consideration consists of two linearly coupled superconducting transmission line resonators and two separated flux qubits, one of which is interacted with one resonator. Applying external driving fields to tailor appropriate qubit-resonator interactions, we show that dissipative photons of the resonators can be exploited to autonomously drive and stabilize the two flux qubits into an approximate Bell state at the stationary state. Because of using the dissipative dynamical process, the present approach does not need to well prepare the initial state of the system and exactly monitor the evolution time. Compared with previous schemes, the present one has the remarkable features that the generation of the entangled state is implemented at a single-photon quantum level, and all four Bell states can be generated and stabilized on demand by changing the external driving parameters. Our result may have useful applications for the realization of quantum computation with superconducting quantum circuits.
We propose a simple scheme for generating n-qubit W state via superconducting quantum interference devices in a single-mode cavity.Superconducting quantum interference devices interact with the cavity resonantly,and the resonant coupling strength is much stronger than other interaction strength,so the other interaction is negligible.Thus,generating n-qubit W state is achieved by only one step evolution.In the case of the decay is close to the coupling of the cavity with the superconducting quantum interference devices,we still generate n-qubit W state successfully.