High-fidelity qutrit entangling gates for superconducting circuits

Goss, Noah; Morvan, Alexis; Marinelli, Brian; Mitchell, Bradley K.; Nguyen, Long B.; Naik, Ravi K.; Chen, Larry; Jünger, Christian; Kreikebaum, John Mark; Santiago, David I.; Wallman, Joel J.; Siddiqi, Irfan

doi:10.1038/s41467-022-34851-z

High-fidelity qutrit entangling gates for superconducting circuits

Journal Article · Sun Dec 04 23:00:00 EST 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-34851-z· OSTI ID:1991514

^[1]; Morvan, Alexis ^[2]; Marinelli, Brian ^[1]; Mitchell, Bradley K. ^[3]; ^[2]; Naik, Ravi K. ^[1]; ^[3]; ^[2]; Kreikebaum, John Mark ^[4]; Santiago, David I. ^[2]; ^[5]; Siddiqi, Irfan ^[6]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Computational Research Division
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Computational Research Division
Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Materials Sciences Division
Keysight Technologies Canada (Canada)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Computational Research Division; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Materials Sciences Division

Ternary quantum information processing in superconducting devices poses a promising alternative to its more popular binary counterpart through larger, more connected computational spaces and proposed advantages in quantum simulation and error correction. Although generally operated as qubits, transmons have readily addressable higher levels, making them natural candidates for operation as quantum three-level systems (qutrits). Recent works in transmon devices have realized high fidelity single qutrit operation. Nonetheless, effectively engineering a high-fidelity two-qutrit entanglement remains a central challenge for realizing qutrit processing in a transmon device. In this work, we apply the differential AC Stark shift to implement a flexible, microwave-activated, and dynamic cross-Kerr entanglement between two fixed-frequency transmon qutrits, expanding on work performed for the ZZ interaction with transmon qubits. We then use this interaction to engineer efficient, high-fidelity qutrit CZ^† and CZ gates, with estimated process fidelities of 97.3(1)% and 95.2(3)% respectively, a significant step forward for operating qutrits on a multi-transmon device.

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:: 1991514

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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