Modern optics v special issues on quantum optics
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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

Modern Optics V- special issues on quantum optics

Special topics course in IAMS

Lecture speaker: Wang-Yau Cheng

2006/4


Outline

Outline

  • Wave properties of light

  • Polarization of light

  • Concept of linewidth

  • Coherence of light

  • Special issues on quantum optics


Modern optics v special issues on quantum optics

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


Studies on quantum controlled cs atoms a dream from comprehend to control the microscopic world

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


Outline1

Outline

  • Quantum controlled by femto-second comb laser

  • What we need in improving the quantum control technique?


How come a god given quantum system can be controllable

How come a God given quantum system can be controllable?


Modern optics v special issues on quantum optics

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 !


For example

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


Femto second comb laser introduction

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)


Modern optics v special issues on quantum optics

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


How to make a highly reliable stable precise accurate reproducible comb photons

How to make a highly reliable, stable, precise, accurate, reproducible

comb photons?

Comb frequency reference to narrow-linewidth atom transition directly!


Modern optics v special issues on quantum optics

  • How come ultra-wide band can resolve ultra-narrow linewidth?


Modern optics v special issues on quantum optics

822 nm

Hyperfine structure of Cs atom

coherent

comb

822 nm

852 nm

895 nm

470 nm

d


Modern optics v special issues on quantum optics

…..

Comprehend by frequency domain

T. H. Yoon, A. Marian, J. L. Hall, and J. Ye, Phys. Rev. A 63, 011402 (2001).


Modern optics v special issues on quantum optics

f=2pd/D

E(t)

t

tr.t.= 1/D

Comprehend by time domain


What s the next step

What’s the next step?


Modern optics v special issues on quantum optics

Atomic beam

Light beam

Example: CW Ramsey Fringes

PRL 94 (2005) 193002


Frequency coherently control

= 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


Modern optics v special issues on quantum optics

D

D

EIT


Cs ionization rate controlling

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


Modern optics v special issues on quantum optics

Controlling ultracold molecular vibrations?


Modern optics v special issues on quantum optics

Control of molecular vibration

K2 photo-dissociation channels controlling?Controlling ultracold molecular vibrations?


Modern optics v special issues on quantum optics

  • 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


Modern optics v special issues on quantum optics

量子控制實驗室

中研院

原子分子研究所331實驗室


2000 2005

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


Modern optics v special issues on quantum optics

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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