Voltage-driven superconducting weak link as a refrigerator for cooling of nanomechanical vibrations

Superconducting cascade electron refrigerator

Coherent dynamics and decoherence in a superconducting weak link

J. T. Peltonen, ∗ Z. H. Peng, Yu. P. Korneeva, B. M. Voronov, A. A. Korneev, 3, 4 A. V. Semenov, 3 G. N. Gol’tsman, 4 J. S. Tsai, 5 and O. V. Astafiev 7, 1, 3, † RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan Moscow State Pedagogical University, 01069, Moscow, Russia Moscow Institute of Physics and Technology, 141700, Dolgoprudny, Moscow Region, Russia National Research...

Feedback cooling of a nanomechanical resonator

Asa Hopkins, Kurt Jacobs, Salman Habib, and Keith Schwab T-8, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA Laboratory for Physical Sciences, College Park, Maryland 20740, USA ~Received 25 February 2003; revised manuscript received 2 July 2003;...

Superconducting transmission lines for use in a He dilution refrigerator

We compare two superconducting transmission lines for use in a He dilution refrigerator using a NbTi wire inner conductor with NbTi foil and CuNi tubing outer conductors. The heat transfer is calculated using the Wiedermann-Franz Law, and the impedance and power loss are measured using a network analyzer at room temperature and at 4K. The transmission line with CuNi tubing is easy to construct,...

Parametric amplification with weak-link nonlinearity in superconducting microresonators

Nonlinear kinetic inductance in a high Q superconducting coplanar waveguide microresonator can cause a bifurcation of the resonance curve. Near the critical pumping power and frequency for bifurcation, large parametric gain is observed for signals in the frequency band near resonance. We show experimental results on signal and intermodulation gain which are well described by a theory of the par...