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Modern Optics V- special issues on quantum optics

Modern Optics V- special issues on quantum optics. Special topics course in IAMS Lecture speaker: Wang-Yau Cheng 2006/4. Outline. Wave properties of light Polarization of light Concept of linewidth Coherence of light Special issues on quantum optics.

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Modern Optics V- special issues on quantum optics

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  1. Modern Optics V- special issues on quantum optics Special topics course in IAMS Lecture speaker: Wang-Yau Cheng 2006/4

  2. Outline • Wave properties of light • Polarization of light • Concept of linewidth • Coherence of light • Special issues on quantum optics

  3. Introduction to the missions of “Quantum Control Laboratory” in IAMS

  4. 量子控制銫原子之研究── 人們的夢想：從了解微觀世界到控制微觀世界Studies on Quantum Controlled Cs atoms-- A dream from comprehend to control the microscopic world

  5. Outline • Quantum controlled by femto-second comb laser • What we need in improving the quantum control technique?

  6. How come a God given quantum system can be controllable?

  7. A quantum system may include: matter quantum states photon states or or or or Or … Atom wavefunction Electron-hole pair Molecule dynamics Ionization rate Cavity modes Quantum system determined by God Photon quantum state Quantum system controlled by human being Total quantum system then be controllable !

  8. q m For example Mixed state Atom / molecule Dressed Atom/molecule Laser pulse By controlling laser pulse, control Pq to the maximum value Sysem can be controlled to quantum state

  9. Df 1/ f rep F.T. Df = wDT = 2pd/frep Femto-second comb laser -- Introduction Time Domain Frequency Domain People now can prepare 105 photon coherent states at the same time ! 2 Df E(t) Time Domain t Phase velocity Group velocity = d d I(f) I(f) f f rep rep Frequency Domain f f 0 0  D. Jones, et al. Science, 288, 635, Apr. 28, 2000 Df comes from phase shift of pulse in cavity (averaged on round trip time DT)

  10. Future directions are wide open • Quantum Optics & Ultrafast physics • Coherent control of quantum states • Arbitrary pulse engineering, Precision control of ultrafast phenomenon • Ultrafast laser with cold atoms: Ultrahigh resolution spectroscopy • Coherent control of THz radiation • Control of single cycle optical pulses: • Extreme nonlinear optics, such as X-ray generation • Optical frequency metrology: • Ultrastable optical frequency synthesizer/network • Optical atomic clock • Ultrafast lasers for precision atomic & molecular spectroscopy • Tests of fundamental physical principles

  11. How to make a highly reliable, stable, precise, accurate, reproducible comb photons? Comb frequency reference to narrow-linewidth atom transition directly!

  12. How come ultra-wide band can resolve ultra-narrow linewidth?

  13. 822 nm Hyperfine structure of Cs atom coherent comb 822 nm 852 nm … 895 nm 470 nm … d

  14. ….. Comprehend by frequency domain T. H. Yoon, A. Marian, J. L. Hall, and J. Ye, Phys. Rev. A 63, 011402 (2001).

  15. f=2pd/D E(t) t tr.t.= 1/D Comprehend by time domain

  16. What’s the next step?

  17. Atomic beam Light beam Example: CW Ramsey Fringes PRL 94 (2005) 193002

  18. = ae-iwat +be-iwbt +ce-iwct F Fa Fb Fc F frequency coherently control a. Quantum beats Be prepared by coherently pump with different frequencies

  19. D D EIT

  20. 8 S 8 S 1 / 2 nm nm 822.5 822.5 7 P = + = f I J 5 6 P 3 / 2 6 P = - = f I J 2 6 P / 2 1 6 S 6 S = + = f I J 4 1 / 2 = - = f I J 3 Cs-ionization rate controlling? Hyperfine structure of Cs atom Linewidth:1.5 MHz 4158.06 MHz MHz coherent 7P1/2: 459.3 nm comb D 30 nm 603 MHz 1167.688 MHz 7P3/2: 455.5 nm 852.347 nm 895 nm d 9192.632 MHz

  21. Controlling ultracold molecular vibrations?

  22. Control of molecular vibration K2 photo-dissociation channels controlling?Controlling ultracold molecular vibrations?

  23. Long term possibilities and collaborating • Quantum control photons • quantum information science • nonlinear optics • quantum optics • Pulse engineering • THz radiation controlling • Quantum control molecules • Chemical dynamics/chemical reaction • Quantum control cool atoms • Atoms in MOT (magnetic-optical trap)/optical lattice • BEC

  24. 量子控制實驗室 中研院 原子分子研究所331實驗室

  25. 光頻率梳雷射於2000年研發成功 2005即獲得諾貝爾獎 • 實驗室未來的方向為利用光梳雷射進行各種量子干涉之觀察與控制，如︰ • 同調激發原子，觀察波函數量子干涉 • 光梳與原子交互作用，進行量子光學實驗 • 與化學動力學專家合作進行各種分子量子態的控制

  26. 歡迎您來我們實驗室參觀！ 來我們實驗室你可以獲得以下的訓練 • 雷射物理 • (CW and pulse，我們常須自己改雷射規格) • 電子電路 • (我們必須自製回授控制線路，溫控器，穩定電流源等) • 光電元件 • (我們常自製光電元件，如光偵測器，電光晶體等) • 量子力學 • 高精密雷射光譜技術

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