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A scalable quantum information processing system and method

A technology of an information processing system and an information processing method, which is applied in the field of scalable quantum information processing systems and can solve problems such as difficulty in generating quantum entanglement, weak coupling between diamond nitrogen and vacancy centers, and the like

Active Publication Date: 2022-05-20
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to solve the technical problem that the coupling between two long-distance diamond nitrogen-vacancy centers is very weak and it is difficult to generate quantum entanglement

Method used

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  • A scalable quantum information processing system and method
  • A scalable quantum information processing system and method
  • A scalable quantum information processing system and method

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Embodiment 1

[0049] Such as figure 1 As shown, the main body of the device is composed of a substrate, carbon nanotubes, diamond microcolumns and electrodes. The top layer of diamond microcolumns can be prepared from a whole flat diamond sample by etching. First, a diamond substrate is spin-coated. A uniform layer of photoresist, etch a series of grooves on the surface by electron beam etching, and then deposit a layer of gold on the surface, treat the surface with a photoresist stripper, and then process it by reactive ion etching technology After cleaning the surface, diamond microcolumns can be obtained.

[0050] The samples of the substrate, carbon nanotubes, diamond microcolumns and the equipment required for subsequent operations are placed in the cryogenic system. Control the prepared diamond microcolumn sample so that it is parallel to the substrate where the carbon nanotubes are placed, place the bent carbon nanotubes on the insulating substrate and contact the source and drain e...

Embodiment 2

[0053] The carbon nanotube double quantum dot system is opposite to the nitrogen-vacancy center of the diamond, the distance is about 6 nanometers, the radius of the carbon nanotube is 1 nanometer, and there is a dipole interaction between the electrons. The coupling Hamiltonian of double quantum dots in the (1,1) state to electrons in nitrogen-vacancy centers can be written as:

[0054]

[0055] here, with Denote the Pauli vectors of the nitrogen-vacancy center electron spin and the quantum dot electron spin-orbit, respectively; where ξ=g || sin 2 α+g ⊥ cos 2 α,η=(g || -g ⊥ )sinαcosα;Ω j Indicates the strength of the external drive; ε=μ B B z / 2, where B z Indicates the magnitude of the external magnetic field, g s Indicates the Landes g factor of the electron, r j Indicates the distance between the electron of the jth nitrogen-vacancy center and the electron of the jth quantum dot. Here it can be assumed that r L = r R , that is, the distance between ...

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Abstract

The invention discloses an expandable quantum information processing system and method, which relate to the technical field of quantum computing. Acquisition system, electric control system. The present invention proposes a carbon nanotube-spin hybrid quantum system, in which a microwave signal and a magnetic field are applied to the area where each group of nitrogen vacancy centers and quantum dots are located, and there is a magnetic field between the electrons of each group of nitrogen vacancy centers and the quantum dots. Dipole-dipole interaction; by manipulating the magnetic field and microwave signal, the indirect coupling between two nitrogen-vacancy centers on the order of micrometers can be achieved through the action of carbon nanotubes, realizing two nitrogen-vacancy centers at a distance Quantum entanglement between centers, thus providing a scalable approach to quantum information processing.

Description

technical field [0001] The present invention relates to the fields of quantum entanglement and quantum computing, and more specifically, relates to a scalable quantum information processing system and method. Background technique [0002] Similar to classical computers, quantum computers also have the concept of bits—qubits. Classical bits have two states, namely '0' or '1'. For a classical bit, it is in a certain state, not '0'. ' is '1', but the qubit is different, it is in a superposition state, written in the notation of quantum mechanics is |Ψ>=α|0>+β|1>, where α and β are complex numbers, and satisfy| α | 2 +|β| 2 =1. Because the qubit is in a superposition state, it will be affected by time and the environment, and the results of multiple measurements may not be the same. [0003] Assembling a quantum computer requires finding a suitable substance to act as a qubit. The qubit is the carrier of quantum information and calculations, and the decoherence time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06N10/20
CPCG06N10/00
Inventor 龚牧桑宋婉露刘海滨蔡建明
Owner HUAZHONG UNIV OF SCI & TECH
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