2021/05/28 by R. T. Gordon, Conal E. Murray, C. E. Murray +26 · 64 citations
Physics and Astronomy · #Condensed matter physics #Electromagnetic shielding #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum decoherence #Quantum mechanics #Quantum tunnelling #Qubit #Superconductivity in MgB2 and Alloys #Transmon #quant-ph
paper · pdf · doi:10.1063/5.0078785
published in Applied Physics Letters 120(7) (American Institute of Physics) · 6 pages, 7 figures, and 2 tables
arxiv created 2021/05/28 · openalex created_date 2021/06/22 · openalex publication_date 2022/02/14 · arxiv updated 2022/03/02 · openalex updated_date 2026/08/05
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.