Study on quantum dot photon emitter and its application to free-space quantum key distribution

量子点光子发射器研究及其在自由空间量子密钥分配中的应用

• 批准号: 18681025
• 负责人: KUMANO Hidekazu
• 金额: $ 18.47万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (A)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2008
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18681025/
• 关键词: 単量子デバイス; 単一光子光源; もつれ合い光子対発生; 相関光子対発生; 単一量子ドット; 光子-電子スピン変換; 光子相関測定; もつれあい光子対; 偏光相関光子対; 光子バンチング; スピン反転

将来の量子鍵配送システム全体として考えた場合、ファイバー系と相補的な役割が期待される空間伝送量子鍵配送に向け、大気の透過率が高くかつSi 単一光子検出器の検出感度とマッチングの良いナノ構造として単一In0.75Al0.25As 量子ドットを形成し、励起エネルギー選択による純度の高い単一光子発生を実現した。さらに、後段での暗号化の際の偏光変調のため高い円偏光度を持つ単一光子の発生を実現した。すなわち、発光エネルギーに対して光学フォノンのエネルギー分高い準位を共鳴的に励起した場合、零磁場中にもかかわらず0.85 と著しい円偏光度の上昇が観測され、電子スピンと光子偏光の間での高効率での状態変換が可能であることが示された。レート方程式解析の結果、InAs LO フォノン共鳴励起下ではスピン反転確率が7.5%以下に抑制され、また荷電励起子基底状態におけるスピン緩和時間は発光再結合寿命の11 倍程度であることが判った。この値は中性励起子のスピン反転時間の約3 倍であり、交換相互作用の無い荷電励起子におけるスピン状態の安定化という、応用に向けて重要な特徴が顕在化された結果と考えられる。これらの成果は、波長短波化した量子ドットによる空間伝送量子暗号通信への展開を展望する上で、非常に大きな意義を持つ。

In the future, the whole system of quantum distribution equipment is in line with each other, and the service cutting system of the system is expected to be used in the space delivery system. The transmission rate of the system is very high. The one-photon output device of the Si device is sensitive to the quality of the equipment. The production of an In0.75Al0.25As quantum device is a good one. It is encouraged to select the high temperature of one photon to produce a photon. In the back part, the signal is coded, the polarization is high, the polarization is high, and one photon is generated. In the field of zero magnetic field, the temperature in the zero magnetic field is 0.85, and the photon polarization is sensitive to the optical polarization. the high frequency of photon polarization and the high frequency of photon polarization in the zero magnetic field may be displayed in the zero magnetic field. The results of the equation are analyzed, the InAs LO response rate is less than 7.5%, the base state of the battery exciter is less than 7.5%, and the recombination life of time phosphor is 11 times higher than that of the load generator. The response time of the neutral exciter is about 3 times as long as that of the neutral exciter, the interaction time of the neutral exciter is about 3 times higher than that of the neutral exciter, the response time of the neutral exciter is about 3 times higher than that of the neutral exciter, the response time of the neutral exciter is about 3 times higher than that of the neutral exciter. In recent years, we have made great achievements in the development of quantum communication systems, such as wavelength shortwave transmission, space transmission, quantum code communication, and the development of quantum code communication systems.

项目成果

Highly Circular-polarized Single Photon Generation from a SingleQuantumDotat ZeroMagnetic Field

从单量子点零磁场产生高度圆偏振的单光子

• 发表时间: 2008
• 期刊: MicroelectronicsJournal Vol.39
• 作者: H.Kobayashi,H.Kumano,M.Endo,M.Jo,I.Suemune,H.Sasakura;S. Adachi;and S. Muto
• 通讯作者: and S. Muto

Superconductor-based Light Emitting Diode: Demonstration of Role of Cooper Pairs in Radiative Recombination Processes

• DOI: 10.1143/apex.1.011701
• 发表时间: 2008-01
• 期刊: Applied Physics Express
• 影响因子: 2.3
• 作者: Y. Hayashi;Kazunori Tanaka;T. Akazaki;M. Jo;H. Kumano;I. Suemune

Single photon emission with high degree of circular polarization from a single quantum dot under zero magnetic field

零磁场下单量子点发射高圆偏振度的单光子

• 发表时间: 2008
• 期刊: Physica E (accepted)
• 作者: H. Kumano ;et. al.
• 通讯作者: et. al.

Excitonic spin-state preservation mediated by optical-phonon resonant excitation in a single quantum dot

单量子点中光声子共振激发介导的激子自旋态保存

• 发表时间: 2008
• 期刊: Phys. Rev B 78
• 作者: H. Kumano;H. Kobayashi;S. Ekuni;Y. Hayashi;M. Jo;H. Sasakura;S. Adachi;S. Muto;and I. Suemune
• 通讯作者: and I. Suemune

Origin of Asymmetric Splitting of a Neutral Exciton in a Single Semiconductor Quantum Dot

单半导体量子点中中性激子不对称分裂的起源

• 发表时间: 2006
• 期刊: phys. Stat. sol cVol. 3, No. 11
• 作者: I. Suemune;H. Kumano;S. Kimura;H. Sasakura;S. Adachi;S. Muto;H. Z. Song;S. Hirose;and T. Usui
• 通讯作者: and T. Usui