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Adaptive Detection of Arbitrarily Shaped Ultrashort Quantum Light States

Adaptive Detection of Arbitrarily Shaped Ultrashort Quantum Light States. C. Polycarpou, K. N. Cassemiro, G. Venturi, A. Zavatta, and M. Bellini Phys . Rev. Lett . 109, 053602 (2012). 報告者： 謝孟哲 指導 老師： 梁君致 日期 ： 2013/12/05. 目錄. 前言 概念

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Adaptive Detection of Arbitrarily Shaped Ultrashort Quantum Light States

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  1. Adaptive Detection of Arbitrarily Shaped Ultrashort Quantum Light States C. Polycarpou, K. N. Cassemiro, G. Venturi, A. Zavatta, and M. Bellini Phys. Rev. Lett. 109, 053602 (2012) 報告者： 謝孟哲 指導老師： 梁君致 日期：2013/12/05

  2. 目錄 • 前言 • 概念 • 實驗設計與應用元件介紹 • 測量結果 • 應用 • 參考資料

  3. Measuring the Shape of a Photon

  4. 概念上的計畫

  5. 實驗設置

  6. HT(high-transmission beam splitter) • 分光鏡是一個光學裝置可以將一個光束分成兩個。 • 通常是一個立體型的光學玻璃鍍膜而成。

  7. 非線性晶體 LBO(lithium triborate crystal) • LiB3O5 • 光學均勻性好 • 可透光波段範圍寬（160—2600nm） • 接收角度寬，色散角度小

  8. ADP(avalanche silicon photodiode) • 半導體光檢測器，其原理類似於光電倍增管。 • 雪崩光電二極體的靈敏度高於其它半導體光電二極體。

  9. 單模光纖SMF • 單模光纖只能傳一種模式的光。 • 其模間色散很小

  10. consisting of two liquid-crystal masks of 2×128 pixels , each 100 μm wide • 連接電腦，控制電壓

  11. 實驗設置

  12. SPDC(Spontaneous parametric down-conversion) BBO

  13. 非線性晶體 BBO(β-barium borate crystal) • 透過波段為189nm～3.5um • 具有大的雙折射率和相當小的色散

  14. BHD(blanced homodyne detector)

  15. genetic algorithm • Here,weuse the measured homodyne data to extract the fitnessparameterfor a genetic algorithm.

  16. FROG

  17. FROG traces 10-cm-long BK7 glass block A frequency-dispersed single-photon FWHM spectral width of about 9.4 nm Homodyne efficiency(η) is about 60% Temporal intensity profiles Reconstructed spectral intensity and phase

  18. BK7 glass block • 高品質光學玻璃，由最純的材料製成。 • 非常清晰，外觀無色 • 低夾雜物和氣泡

  19. FROG traces Michelson interferometer FWHM spectral width of about 6.0 nm temporal profile with a FWHM of about 180 fs Homodyne efficiency(η) is about 60% Temporal intensity profiles Reconstructed spectral intensity and phase

  20. Michelson interferometer

  21. FROG traces Michelson interferometer Homodyne efficiency(η) is about 45% Reconstructed spectral intensity and phase Temporal intensity profiles

  22. 我們來討論最後一種情況

  23. φLO = 0 a single-photon qubit

  24. ΦLo= π

  25. 影響測量的η • Limited detection efficiency • Optical losses • Electronic noise • Dark counts • Residual spatial mismatch

  26. 量子態 • 量子系統的狀態，它給出量子系統的統計描述。 • 量子態包含了體系的全部訊息。 Density matrix can be expreesed as

  27. 應用 • Quantum key • Quantum imaging applications • Quantum informations (encoding) • cluster-state quantum computing • enhanced time metrology

  28. 參考資料 • 量子態，Winger Function--薛哲修、楊淳青， 淺談 Wigner Function- Coherent state and Squeezed state • SPECTRAL FILTERING----http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/FISHER/specfilt.htm • SPDC---維基百科，Spontaneous parametric down-conversion 清大物理系 ，褚志松， A Compact Source of Narrowband Biphotons • LO----Integrated(WWW.TPUB.COM)，Local Oscillators • genetic algorithm---Pesty’sArticles

  29. 參考資料 • 非線性晶體---中國數字科技館，晶體材料 • APD----維基百科，雪崩光電二極體、光電倍增管 • BHD----Sildeshare，Balanced homodyne detection 維基百科，homodyne detection • HT------億達薄膜股份有限公司 • BK7-----Answers.com，What is in k9 glass? • Michelson interferometer---輔大物理光學實驗6 • 單模光纖----百度百科科技台灣(High Teach.tw)，光的模態

  30. Thanks for your attention

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