Optimal feedback for remote entanglement

ORAL

Abstract

Recent experiments in superconducting qubits have demonstrated measurement as a resource for entanglement, even when qubits are spatially separated to a significant degree. We consider the problem of using measurement combined with feedback to deterministically entangle remote qubits. This constraint forces us to consider only local feedback, which leads us to an interesting control-theory problem. Within this constraint, we derive a series of protocols for this system which generate entanglement as quickly as possible. We find that even in the presence of expected experimental imperfections, it should be possible to achieve high-fidelity entanglement with currently accessible experimental parameters.

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Authors

  • L. Martin

    Whaley Research Group and QNL, University of California, Berkeley, QNL, University of California, Berkeley

  • Felix Motzoi

    Whaley Research Group, University of California, Berkeley, University of California, Berkeley

  • Hanhan Li

    Whaley Research Group, University of California, Berkeley

  • Mohan Sarovar

    Whaley Research Group, University of California, Berkeley

  • I. Siddiqi

    Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley CA, QNL, University of California, Berkeley, University California Berkeley, University of California at Berkeley

  • Birgitta Whaley

    Whaley Research Group, University of California, Berkeley