Institute for Experimental and Applied Physics, University of Regensburg, Germany.
Phys Rev Lett. 2011 Jul 1;107(1):017001. doi: 10.1103/PhysRevLett.107.017001. Epub 2011 Jun 29.
An extended Josephson junction can be described as a microwave cavity coupled to a Josephson oscillator. This is formally equivalent to a Fabry-Perot cavity with a freely vibrating mirror, where it has been shown that radiation pressure from photons in the cavity can reduce (increase) the vibrations of the mirror, effectively cooling (heating) it. We demonstrate that, similarly, the superconducting phase difference across a Josephson junction-the Josephson phase-can be "cooled" or "heated" by microwave excitation of the junction and that both these effects increase with microwave power.
一个扩展的约瑟夫森结可以被描述为一个与约瑟夫森振荡器耦合的微波腔。这在形式上等同于一个具有自由振动反射镜的法布里-珀罗腔，其中已经表明腔中的光子的辐射压力可以减小（增加）反射镜的振动，从而有效地冷却（加热）它。我们证明，类似地，通过微波激励约瑟夫森结，约瑟夫森结中的超导相位差——约瑟夫森相位——可以被“冷却”或“加热”，并且这两种效应都随微波功率的增加而增加。
