Engineering Purely Nonlinear Coupling with the Quarton

ORAL

Abstract

We propose using a quarton to facilitate purely nonlinear coupling between two linearly decoupled transmon qubits [1]. The quarton's zero φ2 potential leads to a strong linear scaling of nonlinear coupling strength with Josephson energy; and the quarton's positive φ4 potential can cancel the negative self-Kerr of modes, causing atomic modes to behave more photonic. We show a >1 GHz nonlinear coupling, in the bare mode basis, between two linearized modes with zero self-Kerr; the resulting giant cross-Kerr between photons is promising for applications such as microwave photon detection and bosonic qubit control.

[1] Y. Ye, K. Peng, M. Naghiloo, G. Cunningham, K.P. O'Brien. arXiv: 2010.09959 (2020)

*We acknowledge funding by the MIT Center for Quantum Engineering via support from the Laboratory for Physical Sciences under contract number H98230-19-C-0292.

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Presenters

  • Yufeng Ye

    • Massachusetts Institute of Technology MIT

Authors

  • Yufeng Ye

    • Massachusetts Institute of Technology MIT

  • Kaidong Peng

    • Massachusetts Institute of Technology MIT

  • Mahdi Naghiloo

    • Massachusetts Institute of Technology MIT
    • Electrical Engineering & Computer Science, Massachusetts Institute of Technology

  • Gregory Cunningham

    • Massachusetts Institute of Technology MIT

  • Kevin O'Brien

    • Massachusetts Institute of Technology MIT
    • Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology
    • Univ of California – Berkeley
    • Massachusetts Institute of Technology