atom optics: coherent&incoherent spin manipulation ... · pdf fileatom optics:...
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Atom optics:
Coherent&Incoherent
Spin Manipulation, preparation and evolution
Ernst M. RaselInstitutfürQuantenoptik
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Atom Quantum Sensors on ground and in space
Outline
Laser cooling
Bose-Einsteincondensation
Coherentcontrol of matter
Atom interferometry
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AtomLaser
www.colorado.edu/physics/2000/index.pl
Lase
r C
oolin
g
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Laser Cooling
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Zeeman slower
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Molasses cooling
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Magneto-Optical Trap (MOT)La
ser
Coo
ling
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Magneto-optical trap
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S. Chu, C. Cohen-Tannoudji, W. PhillipsNobel Prize 1997
Magneto-Optical Trap (MOT)
Typical values
density n 109 - 1011 cm-3
temperature T 10 - 100mK
size∆x0.1…10 mm
Lase
r C
oolin
g
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SourceConcept
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Cold atom beam by 2D-MOT
X
Y
Z
Vakuum- pumpe
Kühllaser
Kamera/Fotodiode
Ablenk-Laser
pusher- Strahl
Detektions-strahl
2D-MOT x
Kühllaser
0 5 10 15 20
1,0x109
2,0x109
3,0x109
4,0x109
5,0x109
6,0x109
7,0x109
8,0x109
9,0x109
1,0x1010
1,1x1010
Ato
mflu
ss [N
/s]
Magnetfeldgradient [G/cm]
75mW 112mW 152mW 192mW 219mW
transversal
Divergence: 30 mrad
diameter: 0,9 mm
0 20 40 60 80 1000
100
200
300
400
500
600
700
N(v
) [b
el.E
inhe
iten]
longitudinale Geschwindigkeit [m/s]
211mW 189mW 128mW 75mW
Long. Velocity [m/s]
Num
ber
of a
tom
s [a
.u.]
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3D-MOT loaded by cold atom beam
Loading: ~ 109 atoms/s
lifetime: ~ 90 ms
size: ~1.2 mm (diam.)
Temperature: ~ 100 µK
Laser parameter:
Beam size: 20 mm
axial magnetic
gradient: 12,8 G/cm
Total power 120 mW 2D-MOT
0 5 10 15 20-2
0
2
4
6
8
10
12
14
16
Fül
lrate
[108 A
tom
e/s]
Laserleistung pro MOT-Strahl [mW]
Load
ing
rate
[108
at/s
]
Laser power [mW/MOTbeam]
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Lase
r S
ourc
e
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Excerpt of the level diagram 87RbRelevant transitions for manipulation
with laser light
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F=1F=2
F=1F=2
F=0
F=3
52S1/2
52P3/2
87Rb
F=1
F=2
mF=-1 mF=0 mF=1
mF=-2 mF=-1 mF=0 mF=1 mF=2
52S1/2
State preparation requires control of internal spin states
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Bose-Einstein condensation
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ClassicalQuantum ClassicalQuantum
Tow
ards
„Q
“-w
orld
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Classical
properties
Quantum
features
Wave nature of matter
Louis Victor de Broglie Nobel prize 1929
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v
d
High Temperaturesclassical particles
dBλ
Low Temperatureswave packets
T=TC
Bose-Einstein Condensation
T=0pure BEC
Ultra-cold Gas = extrem low kinetic energy
weak interatomic interaction dominant
Qua
ntum
Mat
ter
3dB
1
ρλ ≈
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need ultra low temperatures
T=0.1 K ρ =1023 cm-3
T= 1 µKρ =1015 cm-3
condensedmatter
Gen
erat
ing
BE
C
11 3
dB3dB ≈⋅⇒≈ ρλρ
λ
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Mag
netic
Tra
ppin
g
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Magnetic field dependenceZeeman effect
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Eva
pora
tiveC
oolin
g
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n < 1
n >> 1
T > TC T < TC
Energy Energy
Par
ticle
Nu
mb
er
Bos
e-E
inst
ein
Con
dens
atio
n
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n < 1
n >> 1
Energy Energy
Par
ticle
Nu
mb
er
Bos
e-E
inst
ein
Con
dens
atio
n
Fermions
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Nobel Prize 2001• E. Cornell & C. Wieman• W. Ketterle
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Lase
r-lik
e fe
atur
es
Pumping Gain medium
Mirror R=100%
Mirror R=9X %
… the atom laser… splitting a condensatewith lasers
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MACROSCOPIC
QUANTUM COHERENCE
M.R. Andrews et al., Science 275, 637 (1997)
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Steps to BEC
• External MOT
• Chip-MOT
• Moving MOT
• Molasses
• State transfer
• Storage in magn. trap
• Evaporation
• Analysis of BEC
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Sun (surface)boiling water
liquid nitrogen
supra conductivity
‘Bose-Einstein Condensation’
Temperature velocity
4000°C - 1 Mio. °C100 °C
-196 °C
-260 °C
5000 - 100.000 m/s700 m/s240 m/s
90 m/s
3 mm/s10 billionth Kelvin
Limits of Laser cooling 3 cm/s1 millionth Kelvin
Latest Temperature record “35 pK”!above
T = 0 Kelvin = - 273 °C
The
Kel
vin
Sca
le
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Matter- Wave Interferometry
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Atom-optics components forcoherent manipulation of matter waves
MIXER
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The
ato
mic
rul
er Louis Victor de Broglie Nobel prize 1929
dBatat
atatatat
hvm
kpvm
λ=
⋅==⋅v
hrv
dBat
2k
λπ=
v
Atomic momentum
De-Broglie wavelength
Planck‘s constant
Classical World Quantum World
λλλλdBUnits in de Broglie wavelength
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The
lase
r ru
ler…
λλλλ Units in light wavelength
c=⋅λνλπω 2
k,e)t,r(E )trk(i =∝ ⋅−⋅vv vv
Laser field
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…based on
the mechanical effect of light
Laser
|g, pat⟩⟩⟩⟩
|e, pat+ħk⟩⟩⟩⟩
|g, pat⟩⟩⟩⟩
Lkr
Ato
mic
Bea
m S
plitt
er
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Coherent Beamsplitterfor Atoms
g
e
Standing light waves as phase gratings
( )
∆πµ=
ω−ω=∆∆π
Ω=∆π
⋅µ=⋅=
h
rr
hh
rrrrrrr
2d
22
)r(E)r(Ed)r(V
2
AL
22
Dynamic Stark-shift
2/
2G
λπ=
v
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Mechanical Effect of Light
recoilsphoton2
2
Gkk
2atomphoton
=
=⇒=λπ
vrr
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Atomic Mach-Zehnder Phase-grating Interferometer
E.M. Rasel, M.K. Oberthaler, H. Batelaan, J. Schmiedmayer, A. Zeilinger
“Atom Wave Interferometry With Diffraction Gratings of Light“
Phys. Rev. Lett. 75, 2633 (1995)
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Light Crystals
• Bloch States• Pendellösung• Anomalous Transmission• Bloch-Oscillations• Anderson Localisation • Mott-Transition
Bose-Einstein Condensate in an opttical lattice, I. Bloch, Nature 2002
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Bragg Scattering
g
e
E
]k[pr
h-1 0 +1
Bragg Resonance
=
Resonant two-photon transiton
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1Φ
Fringe position
Gϑ
ϑ=λ⋅ cosd2n
periodicityM
ergi
ng th
e tw
o ru
lers
Sir William Henry Bragg &William Lawrence BraggNobel Prize 1915
… in the case of Bragg diffraction
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The mechanical effect of light
Laser 1 Laser 2
kgr
h0,1 kgr
h2,2 +
ker
h2,+Raman-process
Laser 1
Laser 2
kr
hr
atomm2
v =∆
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Ram
an-L
aser
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Atom-Optics components made out of Light
MIXER
pulse2/ −π
pulse2/ −π
pulse−π
Puls Duration [µs]
Exc
itatio
npr
obab
ility
Laser 1 Laser 2
kgr
h0,1 kgr
h2,2 +
ker
h2,+
kgkgr
hr
h 2,2, 22 ++
T. Müller et al., "Versatile compact sources for high resolution dual atom interferometry" subm. to Phys. Rev. A 2007
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|e⟩⟩⟩⟩
|g⟩⟩⟩⟩
position
time
S ∼ cos[(φ3 - φ2)-(φ2 -φ1)]
Signal at the output ports
MIRROR
Full quantum mechanical description by C. Antoine, C. Bordé
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|e⟩⟩⟩⟩
|g⟩⟩⟩⟩
position
time
|e⟩⟩⟩⟩
|g⟩⟩⟩⟩
position
time
MIRROR
0,000 0,002 0,004 0,006 0,008 0,010-1,73
-1,72
-1,71
-1,70
-1,69
-1,68
-1,67
-1,66
-1,65
-1,64
phot
odio
de s
igna
l [V
]
time [s]
interferometer 1 interferometer 2
back ground
Exc
itatio
npr
obab
ility
Exc
itatio
npr
obab
ility
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F=1F=2
F=1F=2
F=0
F=3
52S1/2
52P3/2
87Rb
1. • |F=2> to |F‘=2> (p-pol.light)• simultaneously:
repumper |F=1> to |F‘=2>• atoms in |F=2, mF=0>
F=2
F‘=2
mF=-2mF=-1mF=0mF=1 mF=2
mF=-2 mF=-1mF=0 mF=1mF=2
2. • Raman transition
|F=2,mF=0> to |F=1,mF=0>
F=1
F=2
mF=-1mF=0mF=1
mF=-2 mF=-1mF=0 mF=1mF=2
52S1/2
52P3/2
3. • „Blow-away“ |F=2> to |F‘=3>
removes atoms in |F=2>
Preparation of atoms in: |F=1,mF=0>
• repumperlater off thanpumper• all atoms in groundstate |F=2>,
most of them in |F=2,mF=0>
∆
Experimental sequence: Atomic source - Preparation
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Dual Atom Interferometer for Earth rotation sensing
ΩE ≈ 7,2·10-5rad/smolassestheatomicensemblesarelaunched in oppositedirectiontowardstheinterferometerregion, wherebotharesilmultaneouslysplitt,redirected and re-combinedby a Ramanprocess to form an interferencepattern. State peperation has to beperformedbefore and thedetectionaftertheinterferometerregion.
Interferometer
MOT 1
π/2
ππ/2
15 cm
3 mm
A
PreparationDetection
MOT 2
C. Jentsch, T. Müller, E. Rasel, and W. Ertmer, Gen. Rel. Grav, 36, 2197 (2004)& Adv. At. Mol. Physics
Discriminates between both types of inertial forces, rotations and accelerations
transportable
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Technical Implementation
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3D-MOTmoving molasses
2D-MOTatomic source 2 detection
interferometer
preparation
Source 1Source 2
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Detuning of the Raman lasers [Hz]
Exc
itatio
n pr
obab
ility
2 synchronously operated
Ramsey Interferometer
→ Light shift cancelation
→ magnetic field measurement time
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Exc
itatio
n pr
obab
ility
2 synchronously operated Echo Interferometer
→ detection noise
→ phase noise of the RF source
→ magnetic field gradients
Mirror
λ/4
Beam block
fibre
diaphrg
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Exc
itatio
n pr
obab
ility
C1 = 24% C2 = 22%T = 1ms, τ = 7,5µs
π/2π
π/2
Mirror
λ/4
Angle ϑ
fibre
Diaphrg.
Achromat
λ/4
T. Müller, T. Wendrich, M. Gilowski, C. Jentsch, E.M.Rasel and W. Ertmer, ""Dual atom interferometry with cold atoms" in prep.
temporal dual atom interferometer
→contrast reduced because of Doppler sensitive excitation
→ vibrations
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PreparationPreparation
Coherent Superposition
Coherent Superposition
Coherent Evolution
Projection Projection
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Increasingsensitivity
- Long interactiontimes
- Ultra coldatoms
-Coherence
Minimisingphasenoise
- Increasingnumber of atoms
- Beating theshotnoise
- Environmentalcontrol
- Ultrastablelasers (frequency, intensity)
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Matter- Wave Interferometry
SUPERPOSITION PRINCIPLE WAVE-PARTICLE DUALITY
(DE-) COHERENCEWAVE-PARTICLE BEHAVIOR
TOOL FOR CORRELATIONS
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Matter- Wave Interferometry
QUANTUM COMPUTING
QUANTUM METROLOGY
COHERENT STATE ENGINEERINGCOHERENT MATTER WAVE OPTICS
QUANTUM STANDARDS
PRECISION MEASURMENTS
TESTS IN FUNDAMENTAL PHYSICS
EARTH OBSERVATION
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Bose-Einstein condensation
Laser cooling
Matter- Wave Interferometry