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Superconductive quantum bit measuring system

A measurement system, superconducting quantum technology, applied in the field of measurement systems, can solve problems such as noise interference, and achieve the effects of preventing noise interference, reducing noise interference, and reducing noise

Inactive Publication Date: 2007-10-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In view of the above defects, the present invention provides a superconducting qubit measurement system, which can effectively solve the problem of noise interference in the superconducting qubit measurement system

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Embodiment Construction

[0027] Please refer to FIG. 2 , which is a circuit diagram of a superconducting qubit measurement system provided by an embodiment of the present invention.

[0028] As shown in Figure 2, comprise, signal source (201), the current signal output end of this signal source (201) connects one end of the Josephson junction (202) under test, and the current signal output of described signal source (201) end and the measured Josephson junction (202) between the copper powder filter (208) in series, between the current signal output terminal of the signal source (201) and the copper powder filter (208) in series RC filter (209), an optocoupler isolator (210) is connected in series between the current signal output terminal of the signal source (201) and the RC filter (209), and the measured Josephson junction (202 ), the other end of the measured Josephson junction (202) is connected to the two input ends of the low noise amplifier (203) respectively, and the output end of the low noi...

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Abstract

The invention provides a superconductive quantum bit measuring system, comprising a signal source which current signal output is connected with an object Josephson node with two ends respectively connected with two inputs of a low-noise amplifier, while the output of the low-noise amplifier is connected with the positive end of the amplifier, and the negative end of the amplifier is grounded, the output of the amplifier is connected with a stop end of a counter which start end is connected with a synchronous signal output of the signal source, the current signal output of the signal source and the object Josephson node are serially connected with a copper powder filter between, the current signal output of the signal source and the copper powder fiber are serially connected with a RC filter between. The inventive system can effectively reduce noise and meet the demand of superconductive quantum bit measurement.

Description

technical field [0001] The invention relates to a measurement system, in particular to a superconducting qubit measurement system. Background technique [0002] Quantum computing is a field with potentially significant implications for computer science, cryptography, communications technology, as well as national security and commercial applications. Qubit is a basic unit for realizing quantum computer, and superconducting qubit is a scheme with outstanding advantages among many physical carriers. Aiming at a form of superconducting qubit——phase qubit, we analyze and study its thermally excited transition, quantum transition and other characteristics by measuring the statistical distribution of the jump current of the Josephson junction. [0003] In the actual measurement, the method of obtaining the jump current by measuring the time is adopted, that is, the statistical distribution curve of the jump current of a single Josephson junction is obtained by measuring the time,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/035G01R19/30
Inventor 许伟伟
Owner NANJING UNIV
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