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Approximate two-level quantum system based on dual coupling quantum dots

A quantum dot and double-coupling technology, applied in electrical components, nanotechnology, circuits, etc., can solve problems such as artificial two-level structure real-space systems that are rarely reported, and achieve rich tunability, easy control, and small radiation linewidth Effect

Active Publication Date: 2017-06-13
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

[0003] There are few reports on existing artificial two-level structure real-space systems

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  • Approximate two-level quantum system based on dual coupling quantum dots
  • Approximate two-level quantum system based on dual coupling quantum dots
  • Approximate two-level quantum system based on dual coupling quantum dots

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Embodiment Construction

[0020] Such as figure 1 Shown is the double-coupled quantum dot of the present invention, that is, the physical form of space of the present invention. It is composed of two quantum dots 1 and 2 with a fixed distance and equal radius through quantum tunnel coupling. For ease of understanding, the quantum tunneling coupling here can be regarded as the passage of electrons between two quantum dots, so that a bridge-like interaction is formed between the two quantum dots. In general, two quantum dots are coupled to each other, and the electron energy in them is more than two values, each value is an energy level. Here, the two minimum values ​​are taken as the two energy values ​​of the two energy levels, and the coupling structure is regarded as a two energy level system. The main technical problem to be overcome is to design a reasonable ratio of materials, structures, sizes and relative distances, so that the influence of other energy levels on the two-level energy can be ig...

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Abstract

An approximate two-level quantum system based on dual coupling quantum dots is formed by coupling two quasi-two-dimensional disc-shaped quantum dots with determined distance and equal radiuses. Each quantum dot disclosed by the invention is made of a semiconductor material, an energy state of the quantum dot is in a discrete structure by a quantum size effect, two original basic states are split to two levels by a coupling effect between the quantum dots, and the coupling effects of other levels are far smaller than the coupling effect between the two levels. The approximate two-level quantum system based on the dual coupling quantum dots has the advantages of solid state, small size, simple structure, tunability and relatively large coupling coefficient and the like, and can be used for designing various quantum optical devices, such as a terahertz wave source and a single photon source based on a two-level structure.

Description

technical field [0001] The invention relates to a two-level quantum system, in particular to an approximate two-level quantum system based on double-coupled quasi-two-dimensional disk-shaped quantum dots. Background technique [0002] In recent years, with the development of precise manipulation and preparation of low-dimensional structures (small-sized substances), various quantum optical components such as coherent radiation sources, optical switches, and optical amplifiers that use low-dimensional structures as core modules have emerged. The corresponding low-dimensional structural principle model involves the energy level structure of its energy space. Among them, the two-level structure is the most basic energy-level structure unit. Small-scale substances in nature (such as atoms and molecules) have this discrete energy level structure, but there is a lack of ideal two-level quantum systems that can be applied to engineering. [0003] There are few reports on the exis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/04B82Y20/00
CPCB82Y20/00H01L33/04
Inventor 郭世方
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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