Quasiparticle dynamics in superconducting quantum-classical hybrid circuits
Kuang Liu, Xiaoliang He, Zhengqi Niu, Hang Xue, Wenbing Jiang, Liliang Ying, Wei Peng, Masaaki Maezawa, Zhirong Lin, Xiaoming Xie, Zhen Wang
DOI 10.1103/PhysRevB.108.064512 · Physical Review B
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Abstract
Single flux quantum (SFQ) circuitry is a promising candidate for a scalable and integratable cryogenic quantum control system. However, the operation of SFQ circuits introduces nonequilibrium quasiparticles (QPs), which are a significant source of qubit decoherence. In this study, we investigate QP behavior in a superconducting quantum-classical hybrid chip that comprises an SFQ circuit and a qubit circuit. By monitoring qubit relaxation time, we explore the dynamics of SFQ-circuit-induced QPs. Our findings reveal that the QP density near the qubit reaches its peak after several microseconds of SFQ circuit operation, which corresponds to the phonon-mediated propagation time of QPs in the hybrid circuits. This suggests that phonon-mediated propagation dominates the spreading of QPs in the hybrid circuits. Our results lay the foundation to suppress QP poisoning in quantum-classical hybrid systems.
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