Measurement-based Synthesis of multi-qubit Entangled States in Superconducting Cavity QED - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: Entangled multi-qubit states may be generated through a dispersive collectiveQND measurement of superconducting qubits coupled to a microwave transmissionline resonator. Using the quantum trajectory approach, we analyze thestochastic measurement traces that would be observed in experiments. Weillustrate the synthesis of three-qubit W- and GHZ-states, and we analyze howthe fidelity and the entanglement evolve in time during the measurement. Wediscuss the influence of decoherence and relaxation, as well as of imperfectcontrol over experimental parameters. We show that the desired states can begenerated on timescales much faster than the qubit decoherence rates.



Author: Ferdinand Helmer, Florian Marquardt

Source: https://arxiv.org/







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