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Realization of High-Fidelity CZ and ZZ -Free iSWAP Gates with a Tunable Coupler
- Source :
- Physical Review X, Vol 11, Iss 2, p 021058 (2021)
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
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.<br />Comment: 34 pages, 39 figures
Details
- ISSN :
- 21603308
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Physical Review X
- Accession number :
- edsair.doi.dedup.....a8cd74fae539e8dd69f1b14d0b8d78d4