Near-ground state cooling in electromechanics using measurement-based feedback and Josephson parametric amplifier
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911788782583808 |
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| author | Rej, Ewa Cutting, Richa Datta, Debopam Tiencken, Nils Govenius, Joonas Vesterinen, Visa Liu, Yulong Sillanpää, Mika A. |
| author_facet | Rej, Ewa Cutting, Richa Datta, Debopam Tiencken, Nils Govenius, Joonas Vesterinen, Visa Liu, Yulong Sillanpää, Mika A. |
| contents | Feedback-based control of nano- and micromechanical resonators can enable the study of macroscopic quantum phenomena and also sensitive force measurements. Here, we demonstrate the feedback cooling of a low-loss and high-stress macroscopic SiN membrane resonator close to its quantum ground state. We use the microwave optomechanical platform, where the resonator is coupled to a microwave cavity. The experiment utilizes a Josephson travelling wave parametric amplifier, which is nearly quantum-limited in added noise, and is important to mitigate resonator heating due to system noise in the feedback loop. We reach a thermal phonon number as low as 1.6, which is limited primarily by microwave-induced heating. We also discuss the sideband asymmetry observed when a weak microwave tone for independent readout is applied in addition to other tones used for the cooling. The asymmetry can be qualitatively attributed to the quantum-mechanical imbalance between emission and absorption. However, we find that the observed asymmetry is only partially due to this quantum effect. In specific situations, the asymmetry is fully dominated by a cavity Kerr effect under multitone irradiation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_02319 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Near-ground state cooling in electromechanics using measurement-based feedback and Josephson parametric amplifier Rej, Ewa Cutting, Richa Datta, Debopam Tiencken, Nils Govenius, Joonas Vesterinen, Visa Liu, Yulong Sillanpää, Mika A. Quantum Physics Mesoscale and Nanoscale Physics Feedback-based control of nano- and micromechanical resonators can enable the study of macroscopic quantum phenomena and also sensitive force measurements. Here, we demonstrate the feedback cooling of a low-loss and high-stress macroscopic SiN membrane resonator close to its quantum ground state. We use the microwave optomechanical platform, where the resonator is coupled to a microwave cavity. The experiment utilizes a Josephson travelling wave parametric amplifier, which is nearly quantum-limited in added noise, and is important to mitigate resonator heating due to system noise in the feedback loop. We reach a thermal phonon number as low as 1.6, which is limited primarily by microwave-induced heating. We also discuss the sideband asymmetry observed when a weak microwave tone for independent readout is applied in addition to other tones used for the cooling. The asymmetry can be qualitatively attributed to the quantum-mechanical imbalance between emission and absorption. However, we find that the observed asymmetry is only partially due to this quantum effect. In specific situations, the asymmetry is fully dominated by a cavity Kerr effect under multitone irradiation. |
| title | Near-ground state cooling in electromechanics using measurement-based feedback and Josephson parametric amplifier |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.02319 |