Wireless Josephson parametric amplifier above 20 GHz
Abstract
Operating superconducting qubits at elevated temperatures offers increased cooling power, thus system scalability, but requires suppression of thermal photons to preserve coherence and readout fidelity. This motivates migration to higher operation frequencies, which demands high-frequency amplification with near-quantum-limited noise characteristics for qubit readout. Here, we report the design and experimental realization of a wireless Josephson parametric amplifier (WJPA) operating above 20 GHz. The wireless design eliminates losses and impedance mismatches that become problematic at high frequencies. The WJPA achieves more than 20 dB of gain across a tunable frequency range of 21–23.5 GHz, with a typical 3 dB bandwidth of 3 MHz. Through Y-factor measurements and a qubit-based photon number calibration, we show that the amplifier exhibits an added noise of approximately two photons.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (5)
Z. Hao
Chandra Department of Electrical and Computer Engineering, University of Texas at Austin , 2501 Speedway, Austin, Texas 78712,
J. Cochran
Chandra Department of Electrical and Computer Engineering, University of Texas at Austin , 2501 Speedway, Austin, Texas 78712,
Y.-C. Chang
Chandra Department of Electrical and Computer Engineering, University of Texas at Austin , 2501 Speedway, Austin, Texas 78712,
H. M. Cole
Chandra Department of Electrical and Computer Engineering, University of Texas at Austin , 2501 Speedway, Austin, Texas 78712,
S. Shankar
Chandra Department of Electrical and Computer Engineering, University of Texas at Austin , 2501 Speedway, Austin, Texas 78712,