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Bulletin of the American Physical Society

Magnetic Field Effects on High Quality Factor Superconducting Coplanar Resonators

A. Megrant, Charles Neill, R. Barends, Yu Chen, B. Chiaro, J. Kelly, M. Mariantoni, J. Mutus, P. J. J. O’Malley, D. Sank, A. Vainsencher, J. Wenner, Ted White, David Low, Shinobu Ohya, C. J. Palmstrøm, John M. Martinis, Andrew N. Cleland

Published Mar 18, 2013• 0 citations
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Superconducting coplanar waveguide (SCPW) resonators, key components for quantum computing and sensing applications, require a high internal quality factor ( Q i ) for effective qubit readout and quantum sensing applications. Minimizing two-level system (TLS) losses, particularly at material interfaces, is critical for gatemon and topological qubits operating at low temperatures and in high magnetic fields. NbTi, a superconducting alloy with a high upper critical field, enables SCPW resonators resilient to such conditions. We fabricated NbTi SCPW resonators on Si/SiO 2 substrates and systematically characterized their TLS-limited quality factors as functions of temperature and microwave photon number. Our results demonstrate that NbTi-based SCPWs on Si/SiO 2 substrates provide a promising platform for developing next-generation quantum circuits. • Successfully fabricated NbTi SCPW resonators on Si/SiO 2 substrates. • Characterized NbTi SCPW across temperature and photon ranges for quantum apps. • Achieved record TLS-limited quality factor Q TLS,0 = 9.21 × 10 4 for SCPW on Si/SiO 2 . • NbTi SCPW on Si/SiO 2 is promising for gatemon and topological qubits.
Superconducting coplanar waveguide resonators that can operate in strong magnetic fields are important for a variety of high-frequency superconducting devices. Magnetic fields degrade resonator performance by creating Abrikosov vortices that cause resistive losses and frequency fluctuations, or suppress the superconductivity entirely. To mitigate these effects, the authors investigate how device geometry and lithographically defined artificial defects can control vortex dynamics. These techniques allow the resonators to retain single-photon quality factors of about 105{}^{5}5 at ${B}_{\ensuremath{\parallel}}$ \ensuremath{\simeq} 6 T, for fast charge readout of a gate-defined double quantum dot at ${B}_{\ensuremath{\parallel}}$ = 1 T.