Motional sideband asymmetry of a solid-state mechanical resonator at room temperature
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909503252856832 |
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| author | Xia, Yi Huang, Guanhao Beccari, Alberto Zicoschi, Alessio Arabmoheghi, Amirali Engelsen, Nils J. Kippenberg, Tobias J. |
| author_facet | Xia, Yi Huang, Guanhao Beccari, Alberto Zicoschi, Alessio Arabmoheghi, Amirali Engelsen, Nils J. Kippenberg, Tobias J. |
| contents | The motional sideband asymmetry of a mechanical oscillator interacting with a laser field can be observed when approaching the quantum ground state, where the zero-point energy of the mechanical oscillator becomes a sizable contribution to its motion. In the context of quantum optomechanics, it allows, in principle, calibration-free inference of the thermal equilibrium of a macroscopic mechanical resonator with its optical bath. At room temperature, this phenomenon has been observed in pioneering experiments using levitated nanoparticles. Measuring this effect with solid-state mechanical resonators has been compounded by thermal intermodulation noise, mirror frequency noise and low quantum cooperativity. Here, we sideband-cool a membrane-in-the-middle system close to the quantum ground state from room temperature, and observe motional sideband asymmetry in a dual-homodyne measurement. Sideband thermometry yields a minimum phonon occupancy of $\bar{n}_{eff}=9.5$. Our work provides insights into nonlinear optomechanical dynamics at room temperature and facilitates accessible optomechanical quantum technologies without the need for complex feedback control and cryogenic cooling. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_06498 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Motional sideband asymmetry of a solid-state mechanical resonator at room temperature Xia, Yi Huang, Guanhao Beccari, Alberto Zicoschi, Alessio Arabmoheghi, Amirali Engelsen, Nils J. Kippenberg, Tobias J. Quantum Physics The motional sideband asymmetry of a mechanical oscillator interacting with a laser field can be observed when approaching the quantum ground state, where the zero-point energy of the mechanical oscillator becomes a sizable contribution to its motion. In the context of quantum optomechanics, it allows, in principle, calibration-free inference of the thermal equilibrium of a macroscopic mechanical resonator with its optical bath. At room temperature, this phenomenon has been observed in pioneering experiments using levitated nanoparticles. Measuring this effect with solid-state mechanical resonators has been compounded by thermal intermodulation noise, mirror frequency noise and low quantum cooperativity. Here, we sideband-cool a membrane-in-the-middle system close to the quantum ground state from room temperature, and observe motional sideband asymmetry in a dual-homodyne measurement. Sideband thermometry yields a minimum phonon occupancy of $\bar{n}_{eff}=9.5$. Our work provides insights into nonlinear optomechanical dynamics at room temperature and facilitates accessible optomechanical quantum technologies without the need for complex feedback control and cryogenic cooling. |
| title | Motional sideband asymmetry of a solid-state mechanical resonator at room temperature |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2408.06498 |