Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session B36: Supercondcuting Qubits: Circuit Analysis
11:30 AM–1:54 PM,
Monday, March 14, 2022
Room: McCormick Place W-194A
Sponsoring
Unit:
DQI
Chair: David Roberts, University of Chicago
Abstract: B36.00002 : A Tunable Multi-Qubit Coupling Element for Superconducting Circuits*
11:42 AM–11:54 AM
Presenter:
Brian Marinelli
(Computational Research Division, Lawrence Berkeley National Lab)
Authors:
Brian Marinelli
(Computational Research Division, Lawrence Berkeley National Lab)
Jie Luo
(Computational Research Division, Lawrence Berkeley National Lab)
David I Santiago
(Computational Research Division, Lawrence Berkeley National Lab)
Irfan Siddiqi
(Applied Mathematics, Computational Research and Materials Sciences Divisions, Lawrence Berkeley National Lab)
implement programmable (up to all-to-all), tunable coupling between superconducting qubits. In
order to make qualitative and quantitative predictions about the behavior of this circuit element
as a tunable coupling element we develop a theoretical description of its dynamics. We will
outline a framework for analyzing dynamics in the presence of parametric flux modulation
through its boundary SQUIDs. This nonlinearity at the resonator boundary introduces mixing
between the central resonance of the system and the sidebands at integer multiples of the
modulation frequency. These sidebands yield an effective amplitude modulation of the resonance
mode profile from which we compute the resulting time dependent coupling of the tunable
resonator to the superconducting qubits. We present analytical and numerical results for the
coupling, demonstrating quantitative agreement. This time-dependent qubit-resonator coupling
can be used as the basis for two qubit gates and interactions in digital and analog quantum
computing protocols.
*This work was supported by the Office of Advanced Scientific Computing Research, Testbeds for Science program, Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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