Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 10: Precision Measurements and Metrology III (with Q)
A 10.4: Talk
Monday, February 29, 2016, 17:45–18:00, a310
Squeezed vacuum for sub-shot-noise frequency metrology — •Ilka Kruse1, Karsten Lange1, Jan Peise1, Bernd Lücke1, Luca Pezzè2, Jan Arlt3, Wolfgang Ertmer1, Luis Santos4, Augusto Smerzi2, and Carsten Klempt1 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 2QSTAR, INO-CNR and LENS, Firenze, Italy — 3Institut for Fysik og Astronomi, Aarhus Universitet, Denmark — 4Institut für Theoretische Physik, Leibniz Universität Hannover, Germany
All interferometers with classical input states are limited by the shot-noise limit due to the finite particle number. In particular, this effect imposes a limitation for the stability of state-of-the-art atomic microwave clocks. In optics, squeezed vacuum is widely used to overcome this limitation and to operate interferometers beyond the shot-noise limit. Here we create a squeezed vacuum state in an ultracold atomic ensemble by spin-changing collisions. We employ this entangled state to demonstrate a sub-shot-noise frequency measurement in 87Rb. Our frequency measurement shows a minimal fractional instability of 6.1 × 10−10 and a sensitivity of 1.5 dB below shot-noise.