Non-Markovian dynamics of a superconducting qubit in a phononic bandgap
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.
- Publication:
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arXiv e-prints
- Pub Date:
- December 2023
- DOI:
- 10.48550/arXiv.2312.01031
- arXiv:
- arXiv:2312.01031
- Bibcode:
- 2023arXiv231201031O
- Keywords:
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- Quantum Physics
- E-Print:
- 13 pages, 10 figures