Extensible quantum bit structure and preparation method thereof

Abstract

The invention discloses an extensible quantum bit structure and a preparation method, and the structure comprises a substrate (100) on which rectangular grooves (102) arranged in an array are arranged, wherein positioning type self-organizing germanium-silicon nanowires (103) are grown at the two sides of the rectangular grooves (102), and the positions and sizes of the positioning type self-organizing germanium-silicon nanowires (103) are controllable; source and drain electrodes which are arranged at the two ends of the positioning type self-organizing germanium-silicon nanowire (103); a source-drain peripheral large electrode (300) which is connected with the source-drain electrodes; an insulating layer (400) which is formed above the source-drain peripheral large electrode (300), and on which a charge induction quantum dot top metal gate (401) and a detected quantum dot top metal gate (402) which are separated from each other are formed; and a top-layer peripheral large electrode (500) which is connected with the top-layer metal gate. The hole quantum spin bit of the quantum bit structure has longer coherence time, the expansion of the quantum bit structure is facilitated, themeasurement manner belongs to non-destructive measurement, and the sensitivity is high.

Description

technical field [0001] The disclosure relates to the field of quantum computing, in particular to an expandable qubit structure and a preparation method thereof. Background technique [0002] As the chip integration level has entered the nanoscale size, quantum mechanical effects can no longer be ignored. In order to further promote the development of the chip field, physicists have proposed the concept of quantum computing. Among them, the quantum computing system based on semiconductor quantum dots has higher efficiency than the classical scheme on some specific problems, which has attracted great attention from the scientific research community and the industrial circle. [0003] A quantum computing system based on semiconductor quantum dots requires a series of operations on qubits to complete quantum computing. Therefore, the coherence time and number of qubits have direct decisive significance for the computing power and complexity of quantum computing systems. Among ...

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Problems solved by technology

[0006] In view of the above technical problems, the present disclosure proposes a scalable qubit structure and its preparation method, which are used to at least partially solve the limitation in the number of multi-quantum dot structures with detection channels prepared based on silicon germanium two-dimensional electron gas in the prior art, Technical issues such as the limitation of electrode size precision and the limitation of fabricating scalable qubit structures

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