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Sideband Cooling Beyond the Quantum Limit with Squeezed Light

zqyin 添加于 2016-6-30 14:12 | 1065 次阅读 | 0 个评论
  •  作 者

    Clark JB, Lecocq F, Simmonds RW, Aumentado J, Teufel JD
  •  摘 要

    Quantum fluctuations of the electromagnetic vacuum impose an observable quantum limit to the lowest temperatures that can be reached with conventional laser cooling techniques. As laser cooling experiments continue to bring massive mechanical systems to unprecedented temperatures, this quantum limit takes on increasingly greater practical importance in the laboratory. Fortunately, vacuum fluctuations are not immutable, and can be \"squeezed\" through the generation of entangled photon pairs. Here we propose and experimentally demonstrate that squeezed light can be used to sideband cool the motion of a macroscopic mechanical object below the quantum limit. To do so, we first cool a microwave cavity optomechanical system with a coherent state of light to within 15% of this limit. We then cool by more than 2 dB below the quantum limit using a squeezed microwave field generated by a Josephson Parametric Amplifier (JPA). From heterodyne spectroscopy of the mechanical sidebands, we measure a minimum thermal occupancy of 0.19 phonons. With this novel technique, even low frequency mechanical oscillators can in principle be cooled arbitrarily close to the motional ground state, enabling the exploration of quantum physics in larger, more massive systems.
  •  详细资料

    • 关键词: quant-ph
    • 文献种类: Manual Script
    • 期卷页: 2016
    • 日期: 2016-6-29
    • 发布方式: arXiv e-prints
    • 备注:arXiv:1606.08795v1; 4 figures and supplementary information
  • 学科领域 自然科学 » 物理学

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