Topological quantum bit device based on topological semimetal nanostructure and implementation method

Abstract

The invention discloses a topological quantum bit device based on a topological semimetal nanostructure and an implementation method. According to the method, a topological superconductor is formed in the heterojunction of a topological semimetal single-crystal nanostructure and a superconducting layer, and the carrier mobility is regulated and controlled through the double-gate voltage of a top gate and a back gate, so that the quantum confinement effect is regulated and controlled, the topological property of the electronic energy band structure of the nanostructure is changed, two ends of a topological energy band interval are respectively provided with a Majorana quantum state, and the Majorana quantum states are braided through grid voltage regulation and control topological phase change so as to physically construct topological quantum bits; according to the invention, based on the topological phase change of the topological semimetal nanostructure, the Majorana quantum state is constructed, it is ensured that the Majorana quantum state is not de-coherent due to overlapping of wave functions, and the robustness of topological quantum bit devices is improved; the braiding operation of the Majorana quantum state only needs pure electrical modulation, an external magnetic field is not needed, the operation is simple, and integration and application of topological quantum bits are facilitated.

Description

technical field [0001] The invention relates to the field of topological quantum computing, in particular to a topological qubit device based on a topological semimetal nanostructure and an implementation method thereof. Background technique [0002] In the post-Moore era, in order to meet the increasing demand for computing performance in human production and living practices, scientists have been exploring superior quantum computing. The biggest obstacle to the physical realization of quantum computers is quantum decoherence, and topological quantum computing will have higher efficiency and higher anti-interference ability and stability. [0003] The 5 / 2 fractional quantum Hall effect is one of the potential systems to realize topological quantum computing, but it needs experimental conditions of strong magnetic field. Another candidate system is the Majorana (Majorana) non-Abelian anyon quasiparticle in the topological superconductor. Microsoft uses the Majorana quantum...

AI Technical Summary

Problems solved by technology

This solution solves the original problem of phase difference along the junction region, but there are still shortcomings: when the Majorana quantum state is very close, its wave function is prone to overlap and decoherence, which will lead to the failure of the topological qubit; it needs to pass Adding current to the superconducting wire generates a magnetic field, thereby fine-tuning the magnetic field in the superconducting ring, which is difficult to operate

[0005] It can be seen that the implementation of topological qubits in the existing technology is difficult to operate, and it is not conducive to packaging and integration

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