1. Cold Atom project
12/02/2019

2. Motivation Cold single atoms are clean Quantum systems
Indistinguishable atoms have the same precise frequencies
Internal quantum states addressed with narrowband lasers
Arrays of trapped atoms with neighbouring interactions can be a platform for quantum simulations
arXiv: v1

3. Introduction
Magneto Optically Trapped cold Cesium atoms in a Ultra High Vacuum Chamber.
Combination of laser Doppler cooling and magnetic field gradient
~105 cesium atoms trapped
Laser beams
Magnetic field coils

4. Measuring Temperatue from time of Flight
Maxwell–Boltzmann distribution t
Laser beam

5. Fit to get Gaussian waist (σ)
t=0 ms
t=5 ms
Intensity (A.U.)
Intensity (A.U.)
Pixels
Pixels

6. Initial temperature from expansion

7. Intensity and detuning dependence

8. Electric Quadrupole Motivation
Dipole forbidden
Natural decay mainly from 5D5/2  6P3/2
H= 𝑒𝒓.𝑬 −𝑒𝑸 : 𝜵𝑬 + …

9. Laser for electric quadrupole transition