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Real time detecting single electron spinning state method

A real-time detection, single-electron technology, applied in computing models, calculations, instruments, etc., can solve problems that are not conducive to high-speed quantum information processing applications and reduce the working rate of spin detectors.

Active Publication Date: 2013-05-08
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But spin-to-charge conversion at the single-electron level itself presents new experimental challenges
At the same time, the spin-charge conversion step also reduces the working rate of the spin detector, which is not conducive to the application in high-speed quantum information processing

Method used

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  • Real time detecting single electron spinning state method
  • Real time detecting single electron spinning state method
  • Real time detecting single electron spinning state method

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Experimental program
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Effect test

Embodiment Construction

[0024] like figure 1 As shown in (a), spin-polarized single electrons are injected from the injector to the electrode and then transported through the QD. QPC charge detectors and QPC spin detectors can be used to give charge and spin information on the QD.

[0025] like figure 1 As shown in (b), the relationship between the residence time and the critical time satisfaction is Γ d↓ >>τ c >>τ d↑ .

[0026] Another example figure 1 As shown in (c), when a series of electrons are driven through the GD one by one, the spin state of the electrons can be judged by comparing the outputs of the two QPC detectors.

[0027] another example figure 2 As shown, the calculation assumes that the energy of the incident electron is aligned with the spin-down electron energy level.

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Abstract

The present invention relates to a method which can detect the autogiration state of a single electron in real time. When the occurrence of a Zeeman break of the energy level of a quantum point caused by an outside magnetic field or the energy level of a quantum point is relative to the tunneling through rate among the electrodes, the autogiration information which is taken by the single electron is contacted with the stagnant time on the quantum point when the single electron passes through the quantum point. The autogiration state of the electron can be distinguished through designing an appropriate single electron detector and adjusting the noise level of the detector. The detector is anticipated to work with higher frequency; therefore the information in real time of the autogiration state on the quantum point can be presented. The device has important and potential application in the aspect of quantum information processing, so the needed condition can be completely realized in the current experimental condition.

Description

technical field [0001] The invention designs a method for real-time detection of single electron spin state based on quantum dot and quantum dot contact. It has important potential applications in quantum information processing and quantum computing. Background technique [0002] The spin degree of freedom of electrons provides a broader stage for information processing. The direction of the electron spin relative to the external magnetic field or the magnetization direction of the ferromagnetic material can only take two directions of "up" or "down". Therefore, electron spin is the natural carrier of qubits. Qubits implemented based on electron spin are a key component of many solid-state quantum computer architectures. [0003] A key to realizing a spin-based quantum computer is the real-time electrical measurement of the spin state of a single electron. Measurement of single-electron spin states has been difficult because the intrinsic spin-dependent interactions are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06N1/00G06N99/00
Inventor 伍滨和曹俊诚
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI