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Bulletin of the American Physical Society

Reducing dissipation for superconducting qubits

Nasser Alidoust, Ani Nersisyan, Stefano Poletto, Riccardo Manenti, Russ Renzas, Eyob Alebachew Sete, Cat-Vu H. Bui, Kim Vu, Tyler Whyland, Yuvraj Mohan, Sam Stanwyck, Jayss Marshall, Kamal Yadav, Andrew J. Bestwick, Matthew J. Reagor

Published Mar 6, 2019• 0 citations
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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 μsμsμs. We discuss the implications of these observations for extending qubit relaxation times through simultaneous phonon protection and miniaturization.