Quantum parameter amplifier

Abstract

The invention discloses a quantum parameter amplifier, the amplifier comprises a capacitor module, a reflection type microwave resonant cavity and an inductance-adjustable superconducting quantum interference device which are connected in sequence and used for for forming an oscillation amplification circuit, one end, far away from the reflection type microwave resonant cavity, of the inductance-adjustable superconducting quantum interference device is grounded, wherein the frequency of the reflection type microwave resonant cavity is equal to the frequency of a signal to be amplified by adjusting the inductance of the inductance-adjustable superconducting quantum interference device, the signal to be amplified is coupled into the oscillation amplification circuit from the capacitor module, and the oscillation amplification circuit amplifies the signal to be amplified under the action of a pump signal and generates a plurality of idler frequency signals; the circuit also comprises a voltage modulation circuit. The superconducting quantum interferometer device can release at least one idle frequency signal generated in the oscillation amplification circuit under the action of the bias voltage provided by the voltage modulation circuit. The frequency of the pumping signal of the quantum parametric amplifier in the optimal working mode does not need to be selected as the frequencymultiplication of the signal to be amplified.

Description

technical field [0001] The invention belongs to the field of signal amplifiers, in particular to a quantum parameter amplifier. Background technique [0002] In the field of quantum computing, in order to obtain the calculation results of the quantum chip, we need to collect and analyze the output signal of the quantum chip, that is, the qubit read signal. Usually the qubit read signal is very weak, and generally it is necessary to read the signal in the qubit A multi-stage amplifier is added to the output line of the circuit to improve the signal strength. Usually, the pre-stage amplifier adopts a quantum parametric amplifier. Quantum parametric amplifiers operate with low incident noise levels approaching the quantum limit, which is where their name comes from. [0003] The existing quantum parametric amplifier works based on the principle of nonlinear frequency mixing. In order to effectively amplify the qubit read signal and make the quantum parametric amplifier work in...

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Problems solved by technology

[0004] The current problem is that in the best working mode of the existing quantum parametric amplifiers, that is, the frequency of the pump signal must be selected to be close to the multiplier of the frequency of the signal to be amplified, and there are frequencies in the output signal that are extremely close to the frequency of the signal to be amplified. Irrelevant signals, these irrelevant signals are difficult to eliminate through the filter because the frequency is too close to the signal to be amplified, they will interfere with the demodulation process of the qubit read signal, which will lead to the demodulation fidelity and demodulation efficiency of the quantum chip operation results significantly reduce

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