Parametric amplifiers with inductive input coupling for quantum computing systems

An amplifier device comprising:

• a first pole that includes a first inductive-capacitive (LC) resonating circuit;
• a second pole that includes a transmission-line resonator that provides an inductive reactance for an input to the amplifier device;
• a third pole that includes a second LC resonating circuit;
• and
• a capacitor that electrically couples the first pole and the third pole.

A quantum computing system comprising:

• a set of qubits;
• a set of transmission lines, wherein each transmission line of the set of transmission lines is configured to transmit a qubit signal that encodes a measurement of a quantum state of a corresponding qubit of the set of qubits;
• and
• a set of Josephson parametric amplifiers (JPAs), wherein each JPA of the set of JPAs includes a quarter-wavelength transmission-line resonator that electrically couples, via an inductive reactance, the respective JPA to a corresponding transmission line of the set of transmission lines such that the corresponding transmission line inductively provides its qubit signal to the respective JPA for amplification.