Direct detection of quasiparticle tunneling with a charge-sensitive superconducting sensor coupled to a waveguide

• URL: http://arxiv.org/abs/2404.01277v1
• Date: Mon, 1 Apr 2024 17:52:10 GMT
• Title: Direct detection of quasiparticle tunneling with a charge-sensitive superconducting sensor coupled to a waveguide
• Authors: Kazi Rafsanjani Amin, Axel M. Eriksson, Mikael Kervinen, Linus Andersson, Robert Rehammar, Simone Gasparinetti,
• Abstract summary: We demonstrate a quasiparticle detector based on a superconducting qubit directly coupled to a waveguide. We directly measure quasiparticle number parity on the qubit island by probing the coherent scattering of a microwave tone. We observe tunneling rates between 0.8 and $7rms-1$, depending on the average occupation of the detector qubit, and achieve a temporal resolution below $10murms$ without a quantum-limited amplifier.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Detecting quasiparticle tunneling events in superconducting circuits provides information about the population and dynamics of non-equilibrium quasiparticles. Such events can be detected by monitoring changes in the frequency of an offset-charge-sensitive superconducting qubit. This monitoring has so far been performed by Ramsey interferometry assisted by a readout resonator. Here, we demonstrate a quasiparticle detector based on a superconducting qubit directly coupled to a waveguide. We directly measure quasiparticle number parity on the qubit island by probing the coherent scattering of a microwave tone, offering simplicity of operation, fast detection speed, and a large signal-to-noise ratio. We observe tunneling rates between 0.8 and $7~\rm{s}^{-1}$, depending on the average occupation of the detector qubit, and achieve a temporal resolution below $10~\mu\rm{s}$ without a quantum-limited amplifier. Our simple and efficient detector lowers the barrier to perform studies of quasiparticle population and dynamics, facilitating progress in fundamental science, quantum information processing, and sensing.

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