Multi-qubit regulation reading device

A reading device and qubit technology, applied in the field of qubit regulation and reading, can solve the problems of long measurement time and low signal-to-noise ratio, improve control accuracy and stability, improve signal-to-noise ratio, and solve the problem of signal-to-noise ratio. The effect of low noise ratio

Inactive Publication Date: 2019-02-12
EAST CHINA INST OF COMPUTING TECH
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Problems solved by technology

Dispersion reading technology obtains the quantum state through state projection, which does not completely destroy the quantum state, but the disadvantage is that the signal-to-noise ratio is low and the measurement time is long, which brings challenges to efficient quantum error correction and quantum entanglement operations

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0019] The control of superconducting qubits specifically refers to the XY control to realize the transformation of the quantum state (0, 1) and the Z control to adjust the frequency of the qubit. The XY control of a single qubit requires two pulse signal sources with a phase difference of 90 degrees and the IQ modulation synthesis of the local oscillator source. The technical solution proposed by the invention is mainly aimed at the XY control of the qubit and the reading of the quantum state after the...

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Abstract

The invention provides a multi-qubit regulation reading device, comprising a double conversion control unit and a Josephson reference amplifier reading unit, wherein the double conversion control unitcomprises an IQ pulse signal source, a first local oscillation signal source, a second local oscillation signal source, a first mixer and a second mixer, a high frequency pulse signal obtained by virtue of the double conversion control unit enters a chip layer by virtue of a transmission layer to perform quantum state conversion on quantum bits, and the Josephson reference amplifier reading unitcomprises a multi-frequency signal modulation and demodulation unit, a signal transmission unit, a chip connection unit and a Josephson reference amplifier unit. The device provided by the invention adopts a double conversion technology for synthesizing the high frequency pulse signal and controlling multiple quantum bits in parallel, so that quantum bit control accuracy and stability are improvedand cost is reduced; and by adding the Josephson reference amplifier, a signal to noise ratio during state measurement is improved, and single shot non-destructive reading on the quantum bits in short time is realized.

Description

technical field [0001] The invention relates to the field of qubit regulation and reading, in particular to a multi-qubit regulation and reading device. Background technique [0002] The regulation and reading of superconducting quantum chips is an important link in the physical realization of quantum computing. High-precision quantum regulation and reading technology can improve the accuracy of quantum computing results. For a practical and large-scale integrated quantum computer, it is necessary to design a high-quality parallel microwave pulse control signal and a corresponding multi-qubit synchronous reading technical solution. [0003] At present, the control of superconducting qubits is based on a broadband IQ mixer, an arbitrary waveform generator for pulse signal generation, and a microwave local oscillator source for excitation signal generation. The IQ mixer used in this solution needs to meet the requirements of the high-frequency local oscillator source and the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14H04B10/70H04B10/516
CPCH03D7/14H04B10/516H04B10/70
Inventor 江文兵郭科选周明
Owner EAST CHINA INST OF COMPUTING TECH
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