Non-Markovian dynamics of a superconducting qubit in a phononic bandgap

Odeh, Mutasem; Godeneli, Kadircan; Li, Eric; Tangirala, Rohin; Zhou, Haoxin; Zhang, Xueyue; Zhang, Zi-Huai; Sipahigil, Alp

doi:10.1038/s41567-024-02740-5

Non-Markovian dynamics of a superconducting qubit in a phononic bandgap

Journal Article · Tue Jan 07 00:00:00 EST 2025 · Nature Physics

DOI:https://doi.org/10.1038/s41567-024-02740-5· OSTI ID:2544246

Odeh, Mutasem ^[1]; ^[1]; Li, Eric ^[2]; ^[2]; ^[1]; ^[2]; ^[1]; ^[1]

University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of California, Berkeley, CA (United States)

Reducing decoherence in quantum computers rapidly decreases the overhead needed to construct a logical qubit from physical qubits. In solid-state systems, a class of defects known as two-level systems is a major source of decoherence. Currently, superconducting qubit experiments reduce dissipation due to the two-level systems by using large device dimensions. However, this approach only provides partial protection and results in a trade-off between qubit size and dissipation. In this work, we instead engineer the interactions between a qubit and the surrounding two-level systems using phononics. We fabricate a superconducting qubit on a phononic-bandgap metamaterial that suppresses phonon emission mediated by the two-level systems. The phonon-engineered bath of two-level systems shows increased lifetime and affects the thermalization dynamics of the qubit. Within the phononic bandgap, we observe the emergence of a non-Markovian qubit behaviour. Further, combined with qubit miniaturization, our approach could substantially extend the qubit relaxation times.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2544246

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 3 Vol. 21; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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