Hardware-Efficient Microwave-Activated Tunable Coupling between Superconducting Qubits

Mitchell, Bradley K.; Naik, Ravi K.; Morvan, Alexis; Hashim, Akel; Kreikebaum, John Mark; Marinelli, Brian; Lavrijsen, Wim; Nowrouzi, Kasra; Santiago, David I.; Siddiqi, Irfan

doi:10.1103/physrevlett.127.200502

Hardware-Efficient Microwave-Activated Tunable Coupling between Superconducting Qubits

Journal Article · Mon Nov 08 23:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.200502· OSTI ID:1817882

Mitchell, Bradley K. ^[1]; ^[1]; ^[1]; Hashim, Akel ^[1]; ^[1]; Marinelli, Brian ^[1]; ^[2]; Nowrouzi, Kasra ^[1]; ^[1]; Siddiqi, Irfan ^[1]

Univ. of California, Berkeley, CA (United States). Quantum Nanoelectronics Laboratory; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Generating high-fidelity, tunable entanglement between qubits is crucial for realizing gate-based quantum computation. In superconducting circuits, tunable interactions are often implemented using flux-tunable qubits or coupling elements, adding control complexity and noise sources. Here, we realize a tunable $ZZ$ interaction between two transmon qubits with fixed frequencies and fixed coupling, induced by driving both transmons off-resonantly. We show tunable coupling over one order of magnitude larger than the static coupling, and change the sign of the interaction, enabling cancellation of the idle coupling. Further, this interaction is amenable to large quantum processors: the drive frequency can be flexibly chosen to avoid spurious transitions, and because both transmons are driven, it is resilient to microwave crosstalk. We apply this interaction to implement a controlled phase (CZ) gate with a gate fidelity of $$99.43(1)\%$$ as measured by cycle benchmarking, and we observe the fidelity is limited by incoherent errors.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1817882

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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