Speaker
Mr
Yanjie Qiu
(Quantum Nanoelectronics Laboratory, University of California, Berkeley)
Description
Measurement of weak signals consisting of few microwave photons requires multiple amplification stages for efficient detection by room temperature electronics. However, state-of-the-art commercially available microwave amplifiers add the equivalent of tens of photons of noise, making them insufficient for the amplification of single- or sub-photon signals. Interest in measuring photon-level signals from superconducting circuits has motivated the intensive development of Josephson parametric amplifiers (JPAs), which have become workhorses of the superconducting qubit field. The robustness and near quantum-limited noise performance of the JPA also make it an appealing candidate for detecting small microwave signals in axion-search experiments. In this talk, we present a brief introduction to JPAs along with an update on devices fabricated and characterized for ADMX.
Primary author
Mr
Yanjie Qiu
(Quantum Nanoelectronics Laboratory, University of California, Berkeley)
Co-author
Prof.
Irfan Siddiqi
(Quantum Nanoelectronics Laboratory, University of California, Berkeley)