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

• URL: http://arxiv.org/abs/2312.01031v1
• Date: Sat, 2 Dec 2023 05:08:32 GMT
• Title: Non-Markovian dynamics of a superconducting qubit in a phononic bandgap
• Authors: Mutasem Odeh, Kadircan Godeneli, Eric Li, Rohin Tangirala, Haoxin Zhou, Xueyue Zhang, Zi-Huai Zhang, and Alp Sipahigil
• Abstract summary: Current superconducting qubits reduce dissipation due to two-level systems (TLSs) by using large device footprints. This work introduces a new platform using phononics to engineer superconducting qubit-TLS interactions.
• Score: 1.4392875769180546
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The overhead to construct a logical qubit from physical qubits rapidly increases with the decoherence rate. Current superconducting qubits reduce dissipation due to two-level systems (TLSs) by using large device footprints. However, this approach provides partial protection, and results in a trade-off between qubit footprint and dissipation. This work introduces a new platform using phononics to engineer superconducting qubit-TLS interactions. We realize a superconducting qubit on a phononic bandgap metamaterial that suppresses TLS-mediated phonon emission. We use the qubit to probe its thermalization dynamics with the phonon-engineered TLS bath. Inside the phononic bandgap, we observe the emergence of non-Markovian qubit dynamics due to the Purcell-engineered TLS lifetime of 34 $\mu s$. We discuss the implications of these observations for extending qubit relaxation times through simultaneous phonon protection and miniaturization.

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