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Realization of High-Fidelity CZ and ZZ -Free iSWAP Gates with a Tunable Coupler

Author(s)
Sung, Youngkyu; Ding, Leon; Braumüller, Jochen; Vepsäläinen, Antti; Kannan, Bharath; Kjaergaard, Morten; Greene, Ami; Samach, Gabriel O; McNally, Chris; Kim, David; Melville, Alexander; Niedzielski, Bethany M; Schwartz, Mollie E; Yoder, Jonilyn L; Orlando, Terry P; Gustavsson, Simon; Oliver, William D; ... Show more Show less
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Abstract
High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. The advent and use of coupler elements to tunably control two-qubit interactions has improved operational fidelity in many-qubit systems by reducing parasitic coupling and frequency crowding issues. Nonetheless, two-qubit gate errors still limit the capability of near-term quantum applications. The reason, in part, is the existing framework for tunable couplers based on the dispersive approximation does not fully incorporate three-body multi-level dynamics, which is essential for addressing coherent leakage to the coupler and parasitic longitudinal ($ZZ$) interactions during two-qubit gates. Here, we present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. Using this approach, we experimentally demonstrate CZ and $ZZ$-free iSWAP gates with two-qubit interaction fidelities of $99.76 \pm 0.07$% and $99.87 \pm 0.23$%, respectively, which are close to their $T_1$ limits.
Date issued
2021
URI
https://hdl.handle.net/1721.1/143818
Department
Massachusetts Institute of Technology. Research Laboratory of Electronics; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics; Lincoln Laboratory
Journal
Physical Review X
Publisher
American Physical Society (APS)
Citation
Sung, Youngkyu, Ding, Leon, Braumüller, Jochen, Vepsäläinen, Antti, Kannan, Bharath et al. 2021. "Realization of High-Fidelity CZ and ZZ -Free iSWAP Gates with a Tunable Coupler." Physical Review X, 11 (2).
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