Measurement-based Synthesis of multi-qubit Entangled States in Superconducting Cavity QED

Details Measurement-based Synthesis of multi-qubit Entangled States in Superconducting Cavity QED Measurement-based Synthesis of multi-qubit Entangled States in Superconducting Cavity QED

2009-02-02

arxiv.org/abs/0902.0341v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 8 figures

Scientific paper

Entangled multi-qubit states may be generated through a dispersive collective QND measurement of superconducting qubits coupled to a microwave transmission line resonator. Using the quantum trajectory approach, we analyze the stochastic measurement traces that would be observed in experiments. We illustrate the synthesis of three-qubit W- and GHZ-states, and we analyze how the fidelity and the entanglement evolve in time during the measurement. We discuss the influence of decoherence and relaxation, as well as of imperfect control over experimental parameters. We show that the desired states can be generated on timescales much faster than the qubit decoherence rates.

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