Environmental Radiation Impact on Lifetimes and Quasiparticle Tunneling Rates of Fixed-Frequency Transmon Qubits

Abstract

Quantum computing relies on the operation of qubits in an environment as free of noise as possible. This work reports on measuring the impact of environmental radiation on lifetimes of fixed frequency transmon qubits with various capacitor pad geometries by varying the amount of shielding used in the measurement space. It was found that the qubit lifetimes are robust against these shielding changes until the most extreme limit was tested without a mixing chamber shield in the refrigerator. In contrast, the quasiparticle tunneling rates were found to be extremely sensitive to all configurations tested, indicating these devices are not yet limited by losses related to superconducting quasiparticles.

arXiv comment6 pages, 7 figures, and 2 tables

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• Precision measurement of the microwave dielectric loss of sapphire in the quantum regime with parts-per-billion sensitivity
• Distinguishing parity-switching mechanisms in a superconducting qubit
• Realization of High-Fidelity CZ Gate based on a Double-Transmon Coupler
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• Using materials for quasiparticle engineering
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• Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states
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• Cosmic muon flux attenuation methods for superconducting qubit experiments
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