A microkelvin cryogen-free experimental platform with integrated noise thermometry
A microkelvin cryogen-free experimental platform with integrated noise thermometry
复制标题
DOI：
10.1088/1367-2630/15/11/113034
复制
发表时间：
2013-11-15
影响因子：
3.3
通讯作者：
Shibahara, A.
中科院分区：
文献类型：
--
作者：
Batey, G.;Casey, A.;Shibahara, A.
我们报告了使用无制冷剂技术达到1MK以下温度的可行性的实验论证。我们的原型系统包括一个绝热核退磁阶段，它基于超精细增强核磁冷却，与商用无制冷剂稀释式制冷机和8T超导磁体集成在一起。温度测量由电流感应型噪声温度计提供。实验台达到的最低温度为600MK，平台持续低于1MK的时间超过24小时，表明总的余热泄漏进入了5NW的实验阶段。我们将讨论对当前原型设计的直接改进，以期提高性能。这为扩大微开尔文区域内温度的可及性开辟了道路，这在纳米设备中强关联电子态在量子计算中的应用具有潜在的重要性。
We report experimental demonstration of the feasibility of reaching temperatures below 1 mK using cryogen-free technology. Our prototype system comprises an adiabatic nuclear demagnetization stage, based on hyperfine-enhanced nuclear magnetic cooling, integrated with a commercial cryogen-free dilution refrigerator and 8 T superconducting magnet. Thermometry was provided by a current-sensing noise thermometer. The minimum temperature achieved at the experimental platform was 600 mu K. The platform remained below 1 mK for over 24 h, indicating a total residual heat-leak into the experimental stage of 5 nW. We discuss straightforward improvements to the design of the current prototype that are expected to lead to enhanced performance. This opens the way to widening the accessibility of temperatures in the microkelvin regime, of potential importance in the application of strongly correlated electron states in nanodevices to quantum computing.