Parametric amplifier

A technology of amplifier and signal amplifier, applied in the direction of amplifier, superconducting amplifier, amplifier type, etc., can solve the problems of extremely sensitive magnetic field and inapplicability

Pending Publication Date: 2019-11-12
NEWSOUTH INNOVATIONS PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Parametric amplifiers based on Josephson junctions are extremely sensitive to magnetic fields and are therefore not suitable for applications requiring magnetic fields

Method used

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Embodiment Construction

[0047] A signal mixer and amplifier, a method for amplifying a signal, and an apparatus for amplifying a readout signal from a qubit according to specific embodiments are described below.

[0048]In some embodiments, quantum dots and two or more conductive electrodes are used to implement amplifiers to facilitate integration in quantum computing circuits that operate in the presence of magnetic fields. The quantum dots are tuned to the charge degeneration point of the quantum dots to produce nonlinear capacitor behavior. This nonlinearity is used to achieve signal mixing, in particular parametric amplification compatible with semiconductor circuits. In particular, the described embodiments of parametric amplifiers may be used in spin qubit devices.

[0049] Referring to FIG. 1 , schematic side views of four configurations of amplifiers comprising quantum dots and respective electrodes are shown. In the embodiment of FIG. 1, the amplifier is implemented in silicon, and the qu...

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Abstract

The present disclosure relates to parametric amplifiers that can be used in the presence of a magnetic field. In particular the present disclosure relates to an integrated signal amplifier that comprises: a quantum dot; a first conductive electrode arranged in a manner such that tunnelling of electrons to the quantum dot is prevented; and a second conductive electrode arranged in a manner such tunnelling of electrons to the quantum dot is permitted. When an oscillating signal is applied across the first and second electrodes, the equivalent capacitance across the first and the second electrodes oscillates at the frequency of the oscillating signal.

Description

technical field [0001] The present invention relates to parametric amplifiers suitable for use in integrated circuits. In particular, the invention relates to cryogenic parametric amplifiers that can be used in the presence of magnetic fields. Background technique [0002] Parametric amplification is a technique widely used in microwave engineering and optical devices. Parametric amplification relies on nonlinear reactive components (capacitors or inductors for microwaves, nonlinear refraction in optics) to mix the two AC signals. Power can be transferred from one mode ("pump") to another mode ("signal") such that the signal is amplified. The advantage of this type of amplification is that there is no dissipation in purely reactive components, which means that the added noise is minimal. [0003] Parametric amplifiers use, for example, reverse-biased semiconductor diodes which have been shown to have very low noise performance in the microwave region. However, even in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/30H01L31/18H01L51/42H01L51/05H01S5/50H03F19/00
CPCH03F19/00B82Y20/00H03F7/04
Inventor M·G·豪斯
Owner NEWSOUTH INNOVATIONS PTY LTD
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