PhD Defence by Kasper Jensen – Niels Bohr Institute - University of Copenhagen

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PhD Defence by Kasper Jensen

In the thesis several experiments are described. Two-mode squeezed and entangled states of light are stored in a quantum memory consisting of two separate atomic ensembles. The atomic system is also used as a sensor for magnetic fields. The magnetometer has a high sensitivity mainly limited by quantum projection noise. Entanglement-assisted magnetometry is demonstrated. Long-lived atomic entanglement is generated by dissipation. By combining dissipation with continuous measurements, the atoms can be maintained in an entangled steady state. The atomic ensembles are used as a source for two-mode squeezed and entangled light. The squeezed light is generated in a single temporal mode and is naturally compatible with atomic systems based on the same (cesium) atom.