Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature.
Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature.
复制标题
将大型机电系统的正常模式反馈冷却至亚毫开温度。
DOI：
10.1103/physrevlett.101.033601
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发表时间：
2008
影响因子：
8.6
通讯作者：
["A. Vinante
中科院分区：
文献类型：
--
作者：
["A. Vinante
我们采用反馈冷却技术，同时冷却的三个机电正常模式的吨级共振杆引力波探测器AURIGA。测量系统基于直流超导量子干涉仪（SQUID）放大器，反馈冷却电子应用于SQUID的输入电路。从4.2 K的浴温开始，我们实现了最冷正常模式的最低温度为0.17 mK。同样的技术，在一个专门的实验中，在亚开尔文浴温度和量子限制SQUID，可以允许接近量子基态的公斤级机械谐振器。
We apply a feedback cooling technique to simultaneously cool the three electromechanical normal modes of the ton-scale resonant-bar gravitational wave detector AURIGA. The measuring system is based on a dc superconducting quantum interference device (SQUID) amplifier, and the feedback cooling is applied electronically to the input circuit of the SQUID. Starting from a bath temperature of 4.2 K, we achieve a minimum temperature of 0.17 mK for the coolest normal mode. The same technique, implemented in a dedicated experiment at subkelvin bath temperature and with a quantum limited SQUID, could allow to approach the quantum ground state of a kilogram-scale mechanical resonator.