グラフェンのレビトンの放出と一貫した制御

A Assouline¹, L Pugliese^1,2, H Chakraborti¹

¹SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex, France.

Science (New York, N.Y.)

|December 14, 2023

まとめ

研究者は単一の電子飛行クビットをグラフェンにオンデマンドで注入することを設計しましたこのレビトン操作は量子情報処理の従来の量子ビットに期待できる代替手段だ

科学分野:

量子物理学
凝縮物質物理学
量子情報科学

背景:

飛行量子ビットは静止状態とは違って量子情報を伝播するモードを利用します
光子飛行量子ビットは弱い光子の相互作用により条件付き量子ゲートを阻害します
電子フライング・クビットは強い相互作用をしていますが従来の半導体では量子コヒーレンスが欠けています

研究の目的:

単一の電子飛行クビットのオンデマンドの注入と操作を設計する
量子計算のための量子ホール・エッジ・チャネルにおけるレビトンの可能性を探求する.
既存のフライングクビット技術の限界を解決するためです

主な方法:

高移動性のグラフェン単層を量子ホール・エッジ・チャネルに利用する.
単一の電子飛行クビット (Leviton) のオンデマンドインジェクション.
フライングクビット状態の操作を証明する

主要な成果:

単一の電子フライングクビット状態のオンデマンドインジェクションが成功しました.
単一の電子レベルでの移動電子状態の一貫した操作を達成した.
グラフェンで電子飛行量子ビットの有望なアプローチを示した.

結論:

グラフェンの単一の電子飛行クビットの協調的な操作は可能である.
このアプローチは従来型の量子ビットに有効な代替手段であり,一貫性の限界を克服します.
シングルショット・リーダウトと2キビット・オペレーションのさらなる開発は,実用的なアプリケーションのために必要である.

さらに関連する動画

11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

15.5K

15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

5.8K

関連する概念動画

01:12

Fermi Level Dynamics

257

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

257

01:10

Generating Electromagnetic Radiations

2.9K

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...

2.9K

02:39

Emission Spectra

53.2K

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.

53.2K

01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

1.0K

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...

1.0K

01:18

Fermi Level

610

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...

610

01:30

Electromagnetic Waves in Matter

3.0K

Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...