Abnormal Josephson effect-based device and preparation and phase regulation method thereof

A technology of effects and devices, applied in the field of topological quantum computing, which can solve problems such as control that cannot be autonomous

Pending Publication Date: 2022-03-01
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the Josephson N junction formed by multiple superconductors (N≥3), limited by the uniqueness of the superconducting phase, it can only adjust the phase difference of N-1 junction regions, but for the last junction region, it cannot be adjusted. autonomous regulation

Method used

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  • Abnormal Josephson effect-based device and preparation and phase regulation method thereof
  • Abnormal Josephson effect-based device and preparation and phase regulation method thereof
  • Abnormal Josephson effect-based device and preparation and phase regulation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] This example is used to illustrate the preparation method of the device based on the anomalous Josephson effect of the present invention.

[0110] Taking the Josephson triple knot as an example, the preparation method includes the following steps:

[0111] (1) Transfer sample: Bi grown by chemical vapor deposition (CVD) 2 Se 3 The nanosheets are transferred to a silicon substrate with an array of previously prepared markers.

[0112] (2) Glue coating: use MicroChem's PMMA 950A4 glue, and spread the glue evenly on the silicon wafer with a desktop glue spreader at a speed of 4000 rpm for 1 minute. Then bake it on a hot plate at a temperature of 120° C. for 1 minute.

[0113] (3) Exposure: Electron beam exposure is carried out on the Josephson triple junction layer on the Raith150 system, the parameters are aperture 30μm, voltage 10KV, surface exposure dose 100μA / cm 2 . After exposure, develop with MIBK (1:3) for one minute.

[0114] (4) Coating: Use an electron beam...

Embodiment 2

[0119] This example is used to illustrate the phase regulation of the device based on the anomalous Josephson effect prepared in Example 1.

[0120] (1) Packaging: use a WestBond bonding machine to connect to the measurement sample holder, and put it into a dilution refrigerator.

[0121] (2) Low-temperature measurement: use a dilution refrigerator to cool down to 10mK, apply an in-plane magnetic field parallel to the junction region, produce anomalous Josephson effect and change the phase parameter, use the detection electrode to measure the change of the contact resistance with the center point, according to the contact resistance Changes to detect changes in phase parameters.

Embodiment 3

[0123] This example is used to illustrate the anomalous Josephson effect in the device based on the anomalous Josephson effect prepared in Example 1.

[0124] The specific measurement steps are as follows:

[0125] (1) Wiring: Select the device to be measured, and determine the corresponding wiring port of the sample on the dilution refrigerator according to the packaging pattern. The resistance is measured by the four-terminal method, and the current input terminal of the device is connected to the output terminal of the lock-in amplifier with the coaxial cable, the current output terminal of the device is grounded, and the two voltage measurement terminals are connected to the voltage input terminal of the lock-in amplifier.

[0126] (2) Set the lock-in amplifier: set the lock-in amplifier to voltage measurement A-B mode, set the frequency of the output AC voltage to 13.7Hz, to prevent the coupling of mains noise.

[0127] (3) Measuring resistance: adjust the phase-locked o...

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Abstract

The invention provides a device based on an abnormal Josephson effect. The device based on the abnormal Josephson effect sequentially comprises a substrate, a nanosheet, a Josephson N junction pattern layer (N is an integer greater than or equal to 3), a first metal film layer, an insulating layer, a detection electrode pattern layer and a second metal film layer from bottom to top. The invention further provides a preparation and phase regulation and control method of the device. According to the device based on the abnormal Josephson effect, the phase difference of the junction region is regulated and controlled by using the abnormal Josephson effect, so that the means for regulating and controlling the phase difference of the junction region is enriched, meanwhile, all phase differences of Josephson multiple junctions can be completely controlled, and control and reading of topological quantum bits in the future are facilitated.

Description

technical field [0001] The invention belongs to the field of topological quantum computing, and specifically relates to a device based on anomalous Josephson effect, its preparation and phase regulation method. Background technique [0002] With the development of micro-nano technology, the size of integrated chips is getting smaller and closer to the quantum limit, which also means that traditional semiconductor chips will fail due to quantum effects, so the development of quantum computing will be possible Breaking this limitation, and at the same time because of its parallel computing capabilities, it is also expected to obtain computing capabilities that are difficult to achieve in classical computing. At present, quantum computing is still in the development stage, and there are many technical routes, including ion traps, nuclear magnetic resonance, optical quantum systems, semiconductor quantum dots, superconducting quantum systems, and topological quantum computing sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/22H01L39/02H01L39/24G06N10/00H10N60/01H10N60/80
CPCG06N10/00H10N60/805H10N60/12H10N60/0912
Inventor 张祥吕力
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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