Quantop > Quantum Optics Lab > Research
The groups research activities are divided among five experiments.
| The group's research activities are set below ground level in
building U. Here we have at our disposal three newly constructed
laboratory rooms, which contain the group's five experiments. Although
the five experiments can be considered as entities with a set of people
in charge, there is also daily cooperation between all members of the
group, and several of the experiments have or will be combined. |
Cs Cell experiment
Using paraffin coated cells filled with caesium vapour at room
temperature, and shining light pulses through them we can create
entanglement between the two cells and store quantum information of the
light in the atoms.
Mesoscopic atomic ensembles for precision measurements and quantum
technology
We use
laser cooling and trap a cloud of Cesium atoms in a dipole trap.
By a non-destructive interferometric measurement of the hyperfine ground state
populations of an ensemble of cold caesium atoms we squeeze the uncertainty of
the population difference and create spin-squeezed states for metrological
applications. We demonstrated how such an entangled state can be used to
enhance the precision of optical
atomic clocks.
Rb Bose-Einstein condensates
In the BEC lab we cool a gas of rubidium atoms to nano Kelvin
temperatures. The atoms are then so cold that they gather in the lowest
quantum state and form a giant coherent matter wave which is called a
Bose-Einstein-Condensate.
We investigate the interaction of these ultracold, high optical depth
ensembles with light. We studied superradiance and are now working on
storing quantum states of light.
Non-classical light sources
By cavity-enhanced frequency down-conversion we produce non-classical
light states such as squeezed vacuum and EPR-entangled beams, and we aim
for the generation of single photons and related highly nonclassical
states.
Quantum membrane physics
We aim to measure the dynamics of a thin dielectric membrane (~50nm)
with light via cavity-assisted opto-mechanical coupling in a
quantum-noise-limited regime.