Laser cooling a membrane-in-the-middle system close to the quantum ground state from room temperature
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Laser cooling a membrane-in-the-middle system close to the quantum ground state from room temperature. / Saarinen, Sampo A.; Kralj, Nenad; Langman, Eric C.; Tsaturyan, Yeghishe; Schliesser, Albert.
I: Optica, Bind 10, Nr. 3, 20.03.2023, s. 364-372.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Laser cooling a membrane-in-the-middle system close to the quantum ground state from room temperature
AU - Saarinen, Sampo A.
AU - Kralj, Nenad
AU - Langman, Eric C.
AU - Tsaturyan, Yeghishe
AU - Schliesser, Albert
PY - 2023/3/20
Y1 - 2023/3/20
N2 - Many protocols in quantum science and technology require initializing a system in a pure quantum state. In the context of the motional state of massive resonators, this enables studying fundamental physics at the elusive quantum-classical transition, and measuring force and acceleration with enhanced sensitivity. Laser cooling has been a method of choice to prepare mechanical resonators in the quantum ground state, one of the simplest pure states. However, to overcome the heating and decoherence by the thermal bath, this usually has to be combined with cryogenic cooling. Here, we laser-cool an ultracoherent, soft-clamped mechanical resonator close to the quantum ground state directly from room temperature. To this end, we implement the versatile membrane-in-the-middle setup with one fiber mirror and one phononic crystal mirror, which reaches a quantum cooperativity close to unity already at room temperature. We further-more introduce a powerful combination of coherent and measurement-based quantum control techniques, which allows us to mitigate thermal intermodulation noise. The lowest occupancy we reach is 30 phonons, limited by measurement imprecision. Doing away with the necessity for cryogenic cooling should further facilitate the spread of optomechanical quantum technologies. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
AB - Many protocols in quantum science and technology require initializing a system in a pure quantum state. In the context of the motional state of massive resonators, this enables studying fundamental physics at the elusive quantum-classical transition, and measuring force and acceleration with enhanced sensitivity. Laser cooling has been a method of choice to prepare mechanical resonators in the quantum ground state, one of the simplest pure states. However, to overcome the heating and decoherence by the thermal bath, this usually has to be combined with cryogenic cooling. Here, we laser-cool an ultracoherent, soft-clamped mechanical resonator close to the quantum ground state directly from room temperature. To this end, we implement the versatile membrane-in-the-middle setup with one fiber mirror and one phononic crystal mirror, which reaches a quantum cooperativity close to unity already at room temperature. We further-more introduce a powerful combination of coherent and measurement-based quantum control techniques, which allows us to mitigate thermal intermodulation noise. The lowest occupancy we reach is 30 phonons, limited by measurement imprecision. Doing away with the necessity for cryogenic cooling should further facilitate the spread of optomechanical quantum technologies. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
KW - OPTOMECHANICAL SYSTEM
KW - CAVITY
KW - RESONATORS
KW - OSCILLATOR
KW - MOTION
U2 - 10.1364/OPTICA.468590
DO - 10.1364/OPTICA.468590
M3 - Journal article
VL - 10
SP - 364
EP - 372
JO - Optica
JF - Optica
SN - 2334-2536
IS - 3
ER -
ID: 346955645