セミナー

2025/04/23　

Leibniz University Hannover　Chenxi Ma氏

「Boosting Quantum Light: Deterministic Integration of Single-photon Sources with Photonic Nanocavities」

The Purcell effect offers a powerful solution for solid-state quantum emitters, enhancing the brightness while mitigating decoherence. Achieving this enhancement requires precise spectral and spatial coupling—a challenge that has constrained the scalability. In this talk, I will present our endeavour on deterministically integrating quantum dots into photonic nanocavities.

2025/04/17　

Technical University of Munich　Sang Kyu Kim氏

「Unlocking multiphoton emission from a single-photon source through mean-field engineering」

Single-photon emitters are a cornerstone in quantum optics, powering many advancements from quantum technologies. For their performance multiphoton events are traditionally viewed as accidental and undesirable. Therefore, efforts to achieve purer single-photon streams by strongly suppressing multiphoton events have received significant attention. Our study challenges this paradigm by demonstrating that multiphotons in the resonance fluorescence of a two-level system govern the underlying physics of shaping the finally observed outcome in quantum mechanics, despite their small quantitative contribution.

2024/06/13　

NTT物性科学基礎研究所・フォトニックナノ構造研究グループ　高田健太氏

「Non-Hermitian photonics based on photonic crystal nanocavities」

光波のエネルギーを保存しない利得・損失過程により生じる新現象を探究する、非エルミートフォトニクスと呼ばれる分野の研究が進んでいます。本講演では、主にフォトニック結晶結合共振器を用いた、例外点と呼ばれる非エルミート系特有の状態縮退の調査と実証に関し、弊所での取り組みを紹介します。

2023/06/08　

NTT物性科学基礎研究所　太田竜一氏

「微小機械振動構造を用いたエルビウム電子準位の制御」

本講演では、量子メモリや量子変換器として有望視されている結晶中のエルビウムにおいて、振動歪を利用した電子準位の動的制御や振動と電子の結合状態に関する研究成果を紹介する。

2022/06/03　

理化学研究所・加藤ナノ量子フォトニクス研究室 　Chee Fai Fong氏

「Novel schemes for the formation of photonic crystal nanocavities 」

Research on photonic crystals (PhC) and PhC nanocavities have remain active since their formal theoretical conception. They are of great interest for both fundamental and applied research. In my talk, I will present two novel schemes associated with 2-dimensional PhC nanocavities: 1) formation of intrinsically chiral modes in H1 PhC nanocavity by way of non-Hermitian backscattering and 2) formation of heterocavity by refractive index modulation by deposition of layered material onto a PhC waveguide.