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Towards a 4-local coupler for superconducting flux qubits – Part 1: Quantum landscape engineering of the ground state

ORAL

Abstract

The response of a superconducting circuit's ground state energy to external flux is a versatile resource for qubit architecture design. For instance, it can be engineered to mediate interactions between flux qubits or assist in qubit readout. Here we propose a methodology for adding higher-order polynomial terms into the flux dependence of the circuit ground state by strongly coupling a series of rf SQUIDs, thereby landscaping the spectrum at the fluxon level. The operation principle of such a circuit module is demonstrated experimentally. We find that it has the desired spectral property and does not adversely affect the lifetime of a connected flux qubit. It is thus suitable as a quantum coupling or readout module. In addition, we numerically show that the spectral landscaping concept can be scaled by systematically adding circuit loops to the module.

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Presenters

  • Tim Menke

    Harvard Department of Physics, MIT Research Laboratory of Electronics, MIT Department of Physics, MIT Research Laboratory of Electronics, MIT Department of Physics, Harvard Department of Physics, Department of Physics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology

Authors

  • Tim Menke

    Harvard Department of Physics, MIT Research Laboratory of Electronics, MIT Department of Physics, MIT Research Laboratory of Electronics, MIT Department of Physics, Harvard Department of Physics, Department of Physics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology

  • Cyrus Hirjibehedin

    MIT Lincoln Laboratory, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory

  • Steven Weber

    MIT Lincoln Laboratory, MIT Lincoln Lab, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory

  • Jochen Braumüller

    MIT Research Laboratory of Electronics, Massachusetts Institute of Technology MIT

  • Antti Vepsäläinen

    MIT Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Research Laboratory of Electronics, Massachusetts Institute of Technology, Aalto University, Department of Electrical Engineering & Computer Science, Massachusetts Institute of Technology

  • Roni Winik

    MIT Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, MIT

  • Gabriel O Samach

    MIT Research Laboratory of Electronics, MIT Lincoln Laboratory, MIT Department of Electrical Engineering and Computer Science, MIT, Massachusetts Institute of Technology MIT

  • David K Kim

    MIT Lincoln Lab, MIT Lincoln Laboratory, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory, Massachusetts Institute of Technology MIT

  • Alexander Melville

    MIT Lincoln Lab, MIT Lincoln Laboratory, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory

  • Bethany Niedzielski

    MIT Lincoln Laboratory, MIT Lincoln Lab, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory, Massachusetts Institute of Technology MIT

  • Danna Rosenberg

    MIT Lincoln Laboratory, MIT Lincoln Lab, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory

  • Mollie Schwartz

    MIT Lincoln Laboratory, MIT Lincoln Lab, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory

  • Jonilyn Yoder

    MIT Lincoln Laboratory, MIT Lincoln Lab, Research Laboratory of Electronics, Massachusetts Institute of Technology, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory, Massachusetts Institute of Technology MIT

  • Simon Gustavsson

    Research Laboratory of Electronics, Massachusetts Institute of Technology, MIT Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, MIT

  • Andrew James Kerman

    MIT Lincoln Laboratory, MIT Lincoln Lab, Lincoln Laboratory, MIT, MIT - Lincoln Laboratory

  • William Oliver

    MIT Lincoln Laboratory, Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, MIT Lincoln Laboratory, Department of Electrical Engineering and Computer Science, MIT Research Laboratory of Electronics, MIT Lincoln Laboratory, MIT Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, MIT Lincoln Laboratory, MIT, MIT, MIT Lincoln Lab, MIT Lincoln Lab, MIT Lincoln Lab, Massachusetts Institute of Technology, Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, and Department of Physics, Massachusetts Institute of Technology. MIT Lincoln L, Department of Physics, Department of Electrical Engineering & Computer Science, Research Laboratory of Electronics, MIT Lincoln Laboratory, Massachusetts Institute of Technol, Lincoln Laboratory, Research Laboratory of Electronics, and Department of Electrical Engineering & Computer Science, MIT