coherent excitation of rydberg atoms on an atom chip rutger m. t. thijssen van der waals - zeeman...
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![Page 1: Coherent excitation of Rydberg atoms on an atom chip Rutger M. T. Thijssen Van der Waals - Zeeman Instituut voor Experimentele Natuurkunde](https://reader035.vdocuments.site/reader035/viewer/2022062408/56649eff5503460f94c1416c/html5/thumbnails/1.jpg)
Coherent excitation of Rydberg atoms on an atom chip
Rutger M. T. Thijssen
Van der Waals - Zeeman Instituut voor Experimentele Natuurkunde
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Quantum Information Processing
Qubits Coherence Switchable interactions Scalability
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MAGCHIPS
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MAGCHIPS Permanent magnetic lattice atom chip Gold-coated for laser cooling 500 populated magnetic microtraps
Prospective qubits 87Rb, T~mK
10 µm22 µm
Magnetised film
“Atom chip”(room temperature)
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Neutral atoms: intrinsically weak interaction with environment Exquisite control & manipulation Scalability Stable qubits
Quantum information on MAGCHIPS
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Neutral atoms: intrinsically weak interaction with environment Exquisite control & manipulation Scalability Stable qubits
Quantum information on MAGCHIPS
Intrinsically weak interaction with environment Good: long coherence times (~sec.) Challenge: quantum information requires interaction: we have to
work to add an interaction between qubits (i.e. traps)
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Rydberg atoms
Hydrogen-like atom High principal (n) quantum
number Large dipole-dipole interaction
between Rydberg atoms
Dipole blockade
32121 )ˆ)(ˆ(3
R
RRV
2n
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Rydberg Excitation
Toptica DL-100 diode laser (30mW)
Toptica TA-SHG 110 frequency doubled diode laser, tunable from 488-479nm (n=18-ionization threshold) (300mW)
|nd
|5s
|5p
780nm (infrared)
480nm (blue)
|ns
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Electromagnetically Induced Transparency
|nd
E
cji ,
ppc
pp
iL
1222 24
4)(
|5s
|5p
Ωp
δωp
γ12
Detuning (δωp)
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Electromagnetically Induced Transparency
|nd
E
cji ,
ppc
pp
iL
1222 24
4)(
|5s
|5p
Ωc
Ωp
δωp
γ12
Detuning (δωp)
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Electromagnetically Induced Transparency – dressed states
|a+
780nm (infrared)
|a0 (5s)
|a-
Rediagonalise interaction Hamiltonian
Interference between |a+ and |a- dressed states: reduced probe absorption on two-photon resonance
|5s
|5p
|nd
Ωc
Ωp
Autler – Townes splitting + Fano interference
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EIT – frequency stabilisation in a vapour cell
Coupling laser detuning (MHz)
vapour cell EIT, |39ddichroic mirror
dichroic mirror
Rubidium vapour cell
fast photodiode
780 nm diode laser
480 nm diode laser
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EIT Imaging
optical fiber
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EIT Imaging
optical fiber
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Position (px)
Detu
ning
(MHz
)O
ptica
l den
sity
EIT Imaging
Blue laser frequency locked to vapour cell EIT Red laser scanned over resonance
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Surface effects• Near-field blackbody radiation from chip • “mirror” effect: Rydberg atom interacting with itself• Photoelectric effect on surface: adsorbed Rb, Au• Patch potentials
• Crystal defects in FePt• Adsorbed Rb ions
eV58.2/ hcE
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Summary
MAGCHIPS experiment Rydberg / EIT for interactions between qubits
Built laser system Built frequency locking setup for probe and coupling laser
Imaged Rydberg / EIT in surface magneto-optical trap
Investigating effects of surface on Rydberg levels Build a quantum computer…
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Summary
MAGCHIPS experiment Rydberg / EIT for interactions between qubits
Built laser system Built frequency locking setup for probe and coupling laser
Imaged Rydberg / EIT in surface magneto-optical trap
Investigating effects of surface on Rydberg levels Build a quantum computer…
![Page 20: Coherent excitation of Rydberg atoms on an atom chip Rutger M. T. Thijssen Van der Waals - Zeeman Instituut voor Experimentele Natuurkunde](https://reader035.vdocuments.site/reader035/viewer/2022062408/56649eff5503460f94c1416c/html5/thumbnails/20.jpg)
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2-photon gates
Zoller Mesoscopic Rydberg gates using EIT
Rydberg interaction
|0> |1>
|0> |1>
Focused lasers
Ensemble A Ensemble B
Microwave/Raman6.8 GHz
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Rydberg Atoms
One highly excited electron (n=20-100)
Rydberg formula: Size ~ n^2 Lifetime ~ n^3 Polarisability ~n^7 Van der Waals
interaction ~ n^11 Dipole blockade shifts
nearby Rydberg levels
32121 )ˆ)(ˆ(3
R
RRV
2n
2)( l
HB n
hcRE