Full-Wave Computation of the Spontaneous Emission Rate of a Transmon Qubit
Thomas E. Roth, Weng Cho Chew · 2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI) · 2021
Understanding the spontaneous emission rate of transmon qubits is an important step in the design of many quantum electromagnetic devices, such as single photon sources and quantum computers. Despite its importance, the spontaneous emission rate is often determined using approximate circuit models or is inferred from measurements on a fabricated device. To improve the accuracy of predictions, it is better to use full-wave numerical methods for this problem. In this work, we show how this can be done with a recently developed field-based description of transmon qubits coupled to an electromagnetic environment. We demonstrate this process by computing the spontaneous emission rate of a single photon source and find qualitative agreement with a similar fabricated device.