Multiparametric amplification and qubit measurement with a Kerr-free Josephson ring modulator
Tzu-Chiao Chien, Olivia Lanes, C. Liu, Xi Cao, Pinlei Lu, S. Motz, G. Liu, David Pekker, Michael Hatridge · Physical Review A · 2020
Reliably measuring qubits is a necessary step for developing more involved quantum technologies. A method that takes advantage of interference between multiple parametric drives is developed and experimentally tested, showing that a Josephson ring modulator can be operated to provide 21 dB of phase-sensitive transmission gain with high quantum efficiency and enhanced bandwidth.