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Excited state spatial distributions in a cold strontium gas. Graham Lochead. Outline. Motivation and Rydberg physics Experimental details Rydberg spatial distributions. The strontium Rydberg project – April 2012. Strong interactions. E int > E pot ,E kin.

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Excited state spatial distributions in a cold strontium gas

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Excited state spatial distributions in a cold strontium gas

Excited state spatial

distributions in a

cold strontium gas

Graham Lochead


Outline

Outline

Motivation and Rydberg physics

Experimental details

Rydberg spatial distributions

The strontium Rydberg project – April 2012


Strong interactions

Strong interactions

Eint > Epot,Ekin

Problem: Correlations make modelling difficult

Solution: Simulate in controlled environment

The strontium Rydberg project – April 2012


Quantum simulator

Quantum simulator

Need single site addressability

Need strong interactions

…Rydberg atoms

Weitenberg et al, Nature 471, 319–324 (2011)

The strontium Rydberg project – April 2012


Rydberg properties

Rydberg properties

High principal quantum number n

Ionization limit

n = 68

n = 67

n = 8

n = 66

n = 7

Properties

H~ 0.1 nm

n = 6

n = 5

n = 100~ 1 μm

The strontium Rydberg project – April 2012


Rydberg physics

Rydberg physics

Strong, controllable interactions

The strontium Rydberg project – April 2012


Dipole blockade

Dipole blockade

Interaction shift

Energy

Separation

One excitation per atom pair when

The strontium Rydberg project – April 2012


Experimental blockade

Experimental blockade

Saturation of

excitation

H. Schempp et al, Phys. Rev. Lett. 104, 173602 (2010)

CNOT gate

operation

L. Isenhower et al, Phys. Rev. Lett. 104, 010503 (2010)

The strontium Rydberg project – April 2012


Experimental plan

Experimental plan

The strontium Rydberg project – April 2012


Project aim

Project aim

Investigate excited state spatial distributions

Ground state

Excited state

Column

density

Position

T. Pohl et al, Phys. Rev. Lett. 104, 043002 (2010)

The strontium Rydberg project – April 2012


Cold atom setup

Cold atom setup

Zeeman slowed atomic beam

5 x 106 strontium atoms at ~5 mK

2 x 109 atoms/cm3

Rydberg laser locked using EIT

R. P. Abel et al, Appl. Phys. Lett. 94, 071107 (2009)

The strontium Rydberg project – April 2012


Coherent population trapping

Coherent population trapping

5sns(d)

Ions detected on MCP

Ions Rydberg atoms

Sub natural linewidth

Control mJ

λ2 = 413 nm

5s5p

λ1 = 461 nm

5s2

The strontium Rydberg project – April 2012


Autoionization

Autoionization

5s Sr+

e-

5pns(d)

λ3 = 408 nm

5s Sr+

5sns(d)

λ2 = 413 nm

5s5p

Resonant ionization

Independent of excitation

State selective

λ1 = 461 nm

5s2

J. Millen et al, Phys. Rev. Lett. 105, 213004 (2010)

The strontium Rydberg project – April 2012


Focusing and translating

Focusing and translating

The strontium Rydberg project – April 2012


Spatial distribution

Spatial distribution

Focus coupling beam as well

Scan one direction along ensemble

Ground state from camera image

The strontium Rydberg project – April 2012


2d spatial distribution

2D spatial distribution

Multiple slices → 2D spatial map

Ground state

Excited state

The strontium Rydberg project – April 2012


Looking for blockade

Looking for blockade

Vary density of ground state

The strontium Rydberg project – April 2012


Looking for blockade1

Looking for blockade

No blockade so far

Denser sample needed → second stage cooling → dipole trap

The strontium Rydberg project – April 2012


Summary

Summary

Rydberg states have strong interactions

Coherently excited cold strontium to Rydberg states

Measured excited state spatial distributions

The strontium Rydberg project – April 2012


The team

The team

Matt Jones

Charles Adams

Me

Danielle

Boddy

Daniel

Sadler

Christophe

Vaillant

The strontium Rydberg project – April 2012


Excited state spatial distributions in a cold strontium gas

The strontium Rydberg project – April 2012


Laser stabilization

Laser stabilization

5sns(d)

λ2 = 413 nm

5s5p

λ1 = 461 nm

5s2

R. P. Abel et al, Appl. Phys. Lett. 94, 071107 (2009)

The strontium Rydberg project – April 2012


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