Quantum parameter amplifier

A quantum parameter amplifier, comprising a capacitor module a first microwave resonant cavity, and an inductance-adjustable superconducting quantum interference apparatus that are connected in sequence to constitute an oscillation amplifier circuit;

• wherein the superconducting quantum interference apparatus is grounded;
• a signal to be amplified is coupled into the oscillation amplifier circuit from the capacitor module, when a resonant frequency of the first microwave resonant cavity is equal to the frequency of the signal to be amplified;
• the oscillation amplifier circuit amplifies the signal to be amplified under an action of a pump signal and generates idle frequency signals;
• and inductance of the superconducting quantum interference apparatus is adjusted to make the resonant frequency of the first microwave resonant cavity equal to the frequency of the signal to be amplified,
• the quantum parameter amplifier further comprises a voltage modulating circuit and/or a second microwave resonant cavity,
• one end of the voltage modulating circuit is connected with an end of the superconducting quantum interference apparatus that is close to the first microwave resonant cavity;
• the voltage modulating circuit is configured to supply a bias voltage to the superconducting quantum interference apparatus;
• and the superconducting quantum interference apparatus, under an action of the bias voltage, releases at least one type of the idle frequency signals generated in the oscillation amplifier circuit;
• one end of the second microwave resonant cavity is connected with the end of the superconducting quantum interference apparatus that is close to the first microwave resonant cavity;
• and a resonant frequency of the second microwave resonant cavity is equal to a frequency of one type of the idle frequency signals generated by the oscillation amplifier circuit.