Massive Entangled State Engineering and Control of Cold Atoms
Professor Eugene Polzik
Niels Bohr Institute, Copenhagen University
Friday, 30 November 2007, 3.30pm, EN101, Ground Floor, Engineering Building, Hawthorn.
Deterministic entanglement of atoms can be generated via an off-resonant
interaction of light with a multi-atom ensemble combined with a quantum
measurement and feedback. This approach has led to a number of results
with room temperature atoms including the light-to-atoms quantum
In the talk I will concentrate on the recent applications of the quantum
measurement as the state preparation tool for cold atoms. We have applied
the quantum non-demolition interaction to a dipole trapped ensemble of Cs
atoms and have demonstrated that spin squeezing of 105 atoms can be
achieved in this way. This result is directly relevant for the improvement
of the microwave and optical clock accuracy beyond the standard quantum limit.
Properly engineered light-atoms interaction can also serve as a quantum
meter for the many-body entanglement already present in the atomic system.
A recently developed method allows to detect atomic entanglement generated
via magnetic ordering in strongly correlated systems of ultracold atoms.
The atomic state is detected in the least invasive way, via a quantum
non-demolition measurement on the transmitted light.
Back to 2007 programme