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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Silicon photonic chips have the potential to realize complex integrated quantum systems. Presented here is a method for preparing and testing a silicon photonic chip for quantum...
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We describe an optical system for the generation of unconditional polarization-entangled photons based on multiple quantum interference effects with a detection scheme to estimate the experimental fidelity of generated entangled...
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Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN
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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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関連する実験動画

Updated: Jan 19, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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ペルメチル化により,飽和シランに破壊的な量子干渉がもたらされる.

Marc H Garner1, Haixing Li2, Madhav Neupane3

  • 1Nano-Science Center and Department of Chemistry , University of Copenhagen , Universitetsparken 5, 2100 Copenhagen Ø , Denmark.

Journal of the American Chemical Society
|September 11, 2019
PubMed
まとめ

メチルグループは シラン伝導における破壊的量子干渉の鍵です この干渉は単純なアルカンに存在しないが,パーメチル化されたアルカンに観察され,分子電子に置換効果を示している.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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科学分野:

  • 分子電子
  • 量子化学について
  • 有機化学

背景:

  • シランの単分子伝導性は 破壊的な量子干渉によって抑制されます
  • この干渉は,シソイド二面角に関連しており,構造的に類似したアルカンでは観察されていません.

研究 の 目的:

  • シランとアルカンの σ 干渉効果におけるメチル置換物の役割を調査する.
  • 飽和分子の電子輸送特性に対する置換物の影響を理解する.

主な方法:

  • 電子輸送をモデル化するための密度関数理論 (DFT) の計算.
  • シングル分子導電性を測定するためのスキャニングトンネル顕微鏡断路 (STM-BJ) 実験.

主要な成果:

  • メチル置換剤は,シランの σ 干渉を観察するために不可欠です.
  • 非メチル化されたシランと単純なアルカンは同じレベルの破壊的干渉を示さない.
  • ペルメチル化されたサイクルおよびバイサイクルアルカンは,有意に抑制された伝導性を示します.
  • 機能化されたサイクロヘキサンとビサイクロ[2.2.2]オクタンは,パーメチル化されたシランよりも高い伝導性を示す.

結論:

  • アルカンとシルアンの間の電子輸送の違いは,主にメチル置換物質によるもので,骨幹原子によるものではない (C vs. Si).
  • 化学的置換剤は,飽和した有機分子における単一分子伝導性を決定的に影響する.
  • 特定の電子特性を有する分子を設計するには,置換素を考慮することが不可欠です.