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Quantum bit long-range coupling device based on phonon assistance

A coupling device and ultra-long-range technology, which is applied in the field of long-range coupling devices of qubits, can solve problems affecting signal transmission between bits, signal crosstalk of microwave lines, complicated microwave cavity lines, etc., and achieves high quality factor, small size, and device structure. simple effect

Active Publication Date: 2022-02-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, superconducting quantum computing uses a microwave cavity as a quantum bus to achieve long-range coupling of multiple bits through microwaves. However, the circuit of the microwave cavity is relatively complicated, and the cavity length is usually on the order of centimeters, which is not conducive to large-scale integration on the chip.
And there is a problem of signal crosstalk in complex microwave lines, which affects the signal transmission between bits

Method used

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  • Quantum bit long-range coupling device based on phonon assistance
  • Quantum bit long-range coupling device based on phonon assistance
  • Quantum bit long-range coupling device based on phonon assistance

Examples

Experimental program
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Embodiment 1

[0028] This embodiment provides a qubit long-range coupling device based on phonon assistance,

[0029] Including the substrate, the electrode system above the growth substrate, and the one-dimensional nanowire tube structure above the electrode system; the one-dimensional nanowire tube structure is placed on the source electrode 32, and the one-dimensional nanowire tube structure is regulated by the electrode system to form a double A quantum dot system and an auxiliary phonon cavity, the auxiliary phonon cavity is located between two double quantum dot systems; the one-dimensional nanowire tube structure is carbon nanotube or silicon nanowire.

[0030] Dual quantum dot system 1: used to form qubits;

[0031] Auxiliary phonon cavity 2: for indirect coupling between different quantum dots by means of phonon-phonon interactions;

[0032] Electrode system 3: used to regulate the one-dimensional nanowire tube structure to form a double quantum dot system and an auxiliary phonon ...

Embodiment 2

[0048] The difference between this embodiment and Embodiment 1 lies in that more than two auxiliary phonon cavities are arranged between two double quantum dot systems. That is, on the basis of the single auxiliary phonon cavity in embodiment 1, an auxiliary phonon cavity with the same structure is added. Such a structure enables qubit coupling over longer distances.

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 is that: the two double quantum dot systems and the auxiliary phonon cavity between them are one unit, and the device includes more than two units. The unit structure is the same as that of Embodiment 1, and Embodiment 3 is composed of two or more units. This example is integrated and expanded on the basis of Embodiment 1, laying the foundation for realizing the coupling of multiple qubits with longer distances.

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Abstract

The invention discloses a quantum bit long-range coupling device based on phonon assistance. The invention aims to realize long-range coupling of multiple quantum bits on a chip by using a mechanical mode in a single carbon nanotube structure. Through voltage regulation, a double-quantum-dot structure can be formed in the carbon nanotube, and quantum bits can be constructed. The mechanical mode of the carbon nano tube can be used as a phonon cavity to provide phonons, and the phonons can realize coherent long-range transmission along the carbon nano tube. The long-range coupling of the double quantum dots is realized by virtue of the interaction between the double quantum dots and phonons and the interaction between the phonons. The device provided by the invention is simple in structure and small in size, and a new technical route is provided for extensible quantum calculation.

Description

technical field [0001] The invention relates to the field of semiconductors, in particular to a device based on phonon-assisted long-distance coupling of qubits. Background technique [0002] In recent years, the development of quantum computing has been very rapid and has attracted widespread attention. It plays a pivotal role in many fields such as national defense, biopharmaceuticals, urban planning, and artificial intelligence. Qubits are the core components of quantum computing. High-fidelity operations on a certain number of qubits and long-range coupling of multiple bits are the key to realizing quantum computing. In the current solid-state quantum computing system, superconducting quantum computing and semiconductor quantum computing are in a leading position, and some results have been achieved. Among them, superconducting quantum computing uses a microwave cavity as a quantum bus to achieve long-range coupling of multiple bits through microwaves. However, the cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N10/40
CPCG06N10/00
Inventor 邓光伟李通周强宋海智王浟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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