期刊
PHYSICAL REVIEW A
卷 102, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.102.062408
关键词
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资金
- JSPS KAKENHI [26220601, 18K03486]
- JST PRESTO [JPMJPR1667]
- JST ERATO [JPMJER1601]
- MEXT Q-LEAP [JPMXS0118068682]
- Grants-in-Aid for Scientific Research [18K03486] Funding Source: KAKEN
We demonstrate fast two-qubit gates using a parity-violated superconducting qubit consisting of a capacitively shunted asymmetric Josephson-junction loop under a finite magnetic flux bias. The second-order nonlinearity manifesting in the qubit enables the interaction with a neighboring single-junction transmon qubit via first-order interqubit sideband transitions with Rabi frequencies up to 30 MHz. Simultaneously, the unwanted static longitudinal (ZZ) interaction is eliminated with ac Stark shifts induced by a continuous microwave drive near resonant to the sideband transitions. The average fidelities of the two-qubit gates are evaluated with randomized benchmarking as 0.971, 0.958, and 0.962 for CZ, iSWAP, and SWAP gates, respectively.
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