Bogoliubov Quasiparticles in Superconducting Qubits

Abstract

Extending the qubit coherence times is a crucial task in building quantum information processing devices. In the three-dimensional cavity implementations of circuit QED, the coherence of superconducting qubits was improved dramatically due to cutting the losses associated with the photon emission. Next frontier in improving the coherence includes the mitigation of the adverse effects of superconducting quasiparticles. In these lectures, we review the basics of the quasiparticles dynamics, their interaction with the qubit degree of freedom, their contribution to the qubit relaxation rates, and approaches to control their effect.

42 pages, 14 figures. Submitted to SciPost Lecture Notes. To appear in 'Quantum Information Machines; Lecture Notes of the Les Houches Summer School 2019', eds. M. Devoret, B. Huard, and I. Pop

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• Impact of ionizing radiation on superconducting qubit coherence
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• Non-Poissonian Quantum Jumps of a Fluxonium Qubit due to Quasiparticle Excitations
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• Spectral Signatures of Non-Trivial Topology in a Superconducting Circuit
• Charge-parity switching effects and optimisation of transmon-qubit design parameters
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• Andreev spin relaxation time in a shadow-evaporated InAs weak link
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• Yu-Shiba-Rusinov states, the BCS-BEC crossover, and the exact solution in the flat-band limit
• Nonequilibrium regimes for quasiparticles in superconducting qubits with gap-asymmetric junctions
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• Subgap states in superconducting islands
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• Entanglement dynamics and performance of two-qubit gates for superconducting qubits under non-Markovian effects
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• Dissipation and noise in strongly driven Josephson junctions