Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Precision Measurements II (joint session Q/A)

Q 62.5: Talk

Friday, March 15, 2024, 12:00–12:15, HS 1221

Squeezing Enhanced Matterwave Interferometry with BECs — •Christophe Cassens, Bernd Meyer-Hoppe, and Carsten Klempt — Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, D-30167 Hannover, Germany

The gravitational acceleration can be measured with atom interferometers with unprecedented resolution. The ultimate resolution is fundamentally restricted by the standard quantum limit. This restriction can be lifted by operating the interferometer with entangled atoms, which carry quantum correlations among them. Here we present how a squeezed state in the magnetic field insensitive clock states of a Rb-87 BEC of 6000 atoms can be used to improve the sensitivity of an atom gravimeter sequence to -1.5dB below the SQL and -3.3dB below the sensitivity achieved in the same sequence with a coherent state. The here presented technique promises to be applicable in state-of-the-art BEC-based matterwave-interferometers and to increase their sensitivity especially in size, weight and power limited environments.

Keywords: squeezing; entanglement; sub-shot-noise; matter-wave interferometry; BEC