Direct detection of quasiparticle tunneling with a charge-sensitive superconducting sensor coupled to a waveguide
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913293949468672 |
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| author | Amin, Kazi Rafsanjani Eriksson, Axel M. Kervinen, Mikael Andersson, Linus Rehammar, Robert Gasparinetti, Simone |
| author_facet | Amin, Kazi Rafsanjani Eriksson, Axel M. Kervinen, Mikael Andersson, Linus Rehammar, Robert Gasparinetti, Simone |
| contents | 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 $10~μ\rm{s}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01277 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct detection of quasiparticle tunneling with a charge-sensitive superconducting sensor coupled to a waveguide Amin, Kazi Rafsanjani Eriksson, Axel M. Kervinen, Mikael Andersson, Linus Rehammar, Robert Gasparinetti, Simone Quantum Physics Mesoscale and Nanoscale Physics 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 $10~μ\rm{s}$ 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. |
| title | Direct detection of quasiparticle tunneling with a charge-sensitive superconducting sensor coupled to a waveguide |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.01277 |