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Josephson-junction based parametric amplifiers have become a ubiquitouscomponent in superconducting quantum machines. Although parametric amplifiersregularly achieve near-quantum limited performance, they have many limitations,including low saturation powers, lack of directionality, and narrow bandwidth.The first is believed to stem from the higher order Hamiltonian terms endemicto Josephson junction circuits, and the latter two are direct consequences ofthe nature of the parametric interactions which power them. In this work, weattack both of these issues. First, we have designed a new, linearly shuntedJosephson Ring Modulator (JRM) which nearly nulls all 4th-order terms at asingle flux bias point. Next, we achieve gain through a pair of balancedparametric drives. When applied separately, these drives producephase-preserving gain (G) and gainless photon conversion (C), when appliedtogether, the resultant amplifier (which we term GC) is a bi-directional,phase-sensitive transmission-only amplifier with a large, gain-independentbandwidth. Finally, we have also demonstrated the practical utility of the GCamplifier, as well as its' quantum efficiency, by using it to read out asuperconducting transmon qubit.

Multiparametric Amplification and Qubit Measurement with a Kerr-free Josephson Ring Modulator