2007/06/15 by M. A. Castellanos-Beltran, K. W. Lehnert · 7 citations
Engineering · Physics and Astronomy · #Advanced Electrical Measurement Techniques #Advanced Frequency and Time Standards #Physics of Superconductivity and Magnetism #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1063/1.2773988
published as Widely tunable parametric amplifier based on a superconducting quantum interference device array resonator M. A. Castellanos-Beltran and K. W. Lehnert, Appl. Phys. Lett. 91, 083509 (2007) · 9 pages, 4 figures, submitted to Applied Physics Letters
arxiv created 2007/06/15 · openalex publication_date 2007/08/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The authors create a Josephson parametric amplifier from a transmission line resonator whose inner conductor is made from a series of superconducting quantum interference device (SQUID) array. By changing the magnetic flux through the SQUID loops, they are able to adjust the circuit’s resonance frequency and the center of the amplified band between 4 and 7.8GHz. They observe that the amplifier has gains as large as 28dB and infers that it adds less than twice the input vacuum noise.