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Entanglement-assisted atomic clock beyond the projection noise limit
Anne Louchet-Chauvet, Jürgen Appel, Jelmer J. Renema +3
We use a quantum non-demolition measurement to generate a spin squeezed state and to create entanglement in a cloud of 10^5 cold cesium atoms, and for the first time operate an ato…
Squeezing of Atomic Quantum Projection Noise
Patrick J. Windpassinger, Daniel Oblak, Ulrich B. Hoff +4
We provide a framework for understanding recent experiments on squeezing of a collective atomic pseudo-spin, induced by a homodyne measurement on off-resonant probe light interroga…
Ultra--low noise differential AC-coupled photodetector for sensitive pulse detection applications
P. J. Windpassinger, M. Kubasik, M. Koschorreck +4
We report on the performance of ultra low noise differential photodetectors especially designed for probing of atomic ensembles with weak light pulses. The working principle of the…