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Superconducting Qubits for Robust Remote Entanglement via Adiabatic State Transfer

ORAL

Abstract

Efficient quantum communication between remote quantum nodes relies on high fidelity quantum state transfer and entanglement generation. Loss in the communication channel connecting the quantum nodes can significantly limit the efficiency of these processes. One proposed method to overcome channel loss is to use adiabatic protocols to transfer quantum states without populating the lossy communication channel. Here we construct and operate a superconducting system to test such methods, using two superconducting qubits connected by a 0.73 m long transmission channel, where the channel loss can be externally varied over two orders of magnitude (as measured by the Q of the resonant channel modes). We demonstrate that in the limit of low loss, an adiabatic passage method performs as well as previously demonstrated relay method [1], while in the presence of strong loss, the adiabatic passage achieves states transfer and entanglement fidelities more than a factor of two larger than the relay method.
[1] Y. Zhong, et al., Nature Physics 15, 741 (2019).

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Presenters

  • Hung-Shen Chang

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

Authors

  • Hung-Shen Chang

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Youpeng Zhong

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Audrey Bienfait

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Ming-Han Chou

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Christopher R Conner

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Etienne Dumur

    Argonne National Laboratory; University of Chicago, Neel Institute, University Grenoble Alpes, CNRS, Argonne National Laboratory, University of Chicago; Argonne National Laboratory, Institute for Molecular Engineering, University of Chicago, Chicago IL 60637,USA

  • Joel Grebel

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Gregory Peairs

    University of California, Santa Barbara; University of Chicago, Department of Physics, University of California, Santa Barbara

  • Rhys G Povey

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago

  • Kevin Satzinger

    University of California, Santa Barbara; University of Chicago(present in Google Inc), Google LLC, Google AI Quantum, Google Inc - Santa Barbara, University of California, Santa Barbara; University of Chicago

  • Andrew Cleland

    University of Chicago, Argonne National Laboratory; University of Chicago, Pritzker School of Molecular Engineering, University of Chicago, Argonne National Laboratory, University of Chicago; Argonne National Laboratory