Quantum parameter amplifier

Abstract

The invention discloses a quantum parameter amplifier, comprising a first capacitor module, a transmission type microwave resonant cavity, a second capacitor module and an inductance-adjustable superconducting quantum interference device which are used for forming an oscillation amplification circuit. The first capacitor module, the transmission type microwave resonant cavity and the second capacitor module are sequentially connected. One end of the superconducting quantum interference device is connected to the middle of the transmission type microwave resonant cavity, and the other end is grounded. The oscillation amplification circuit is used for amplifying a signal to be amplified under the action of a pumping signal and generating a plurality of idle frequency signals, and the voltage modulation circuit is arranged at one end, close to the transmission type microwave resonant cavity, of the superconducting quantum interference device. 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 parameter amplifier in the optimal working mode does not need to be selected as the frequency multiplication 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 as a multiplier of the frequency of the signal to be amplified, and there is an irrelevant frequency in the output signal that is extremely close to the frequency of the signal to be amplified. 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 a significant increase in the demodulation fidelity and demodulation efficiency of the quantum chip operation results. reduce

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