Three-qubit remote entanglement by joint measurement and feedback control

ORAL

Abstract

For remote qubits, a direct non-local interaction is generally not available, in part because the coherence of any transmitted signal is degraded by loss. In this situation, joint measurement and feedback control nevertheless allow creation of entanglement between remote qubits. Such schemes are known for deterministic generation of Bell states, but the generalization to larger systems has not been studied. We present such a control protocol based on the average sense local optimality (ASLO) approach for generating entanglement in a three-qubit system without an entangling Hamiltonian. Analytical and numerical methods to enhance the generation of different types of three-qubit entanglement are presented.

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Authors

  • Song Zhang

    • Univ of California - Berkeley

  • Leigh Martin

    • Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA.
    • University of California, Berkeley
    • Quantum Nanoelectronics Laboratory,Department of Physics, University of California, Berkeley
    • Univ of California - Berkeley
    • Quantum Nanoelectronics Lab, Center for Quantum Coherent Sciences, UC Berkeley

  • K. Birgitta Whaley

    • University of California, Berkeley
    • Univ of California - Berkeley
    • UC Berkeley