Quasiparticle Dynamics in Superconducting Quantum-Classical Hybrid Circuits

• URL: http://arxiv.org/abs/2307.14130v1
• Date: Wed, 26 Jul 2023 11:54:44 GMT
• Title: Quasiparticle Dynamics in Superconducting Quantum-Classical Hybrid Circuits
• Authors: Kuang Liu, Xiaoliang He, Zhengqi Niu, Hang Xue, Wenbing Jiang, Liliang Ying, Wei Peng, Masaaki Maezawa, Zhirong Lin, Xiaoming Xie, Zhen Wang
• Abstract summary: Single flux quantum (SFQ) circuitry is a promising candidate for a scalable and integratable cryogenic quantum control system. In this study, we investigate non-equilibrium quasiparticles (QPs) in a superconducting quantum-classical hybrid chip.
• Score: 4.556590964168528
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 non-equilibrium 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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