Interferometry with ultra-cold few-atom states

Patrick Plötz, Sandro Wimberger

Mikhail N. Kiselev, Anil Adhikari

Aashish Kafle, Sheng‐wey Chiow, Nan Yu

G. V. Osipenko, E.V. Ivanchenko, V. N. Baryshev +2 more

We report the construction and investigation of an ultra-stable laser system with a narrow spectral line of a few kHz. The system is based on frequency doubled 1560 nm fiber lasers, commonly used in telecommunications. We expect to use this system in future experiments for the development of the fountain type quantum frequency standards and quantum sensors based on atom interferometry.

Heng Zhang, Xudong Ren, Wenhua Yan +6 more

The temperature of atoms, coupled to several effects, plays an important role in high precision atom interferometry gravimeters. In this work, we present an ultra-cold 87Rb atom interferometry gravimeter, in which the atom source is produced by evaporative cooling in an all optical dipole trap to investigate the effects related to atom temperature. A condensate containing 4 × 104 atoms can be prepared within 3.2 s through an all-optical dipole trap composed of two reservoirs and a dimple. The fringe contrast of our atom interferometry gravimeter reaches up to 76(4)% due to the advantage of ultra-cold atom source even at a free evolution time of T=80 ms. A resolution of 6 μGal (1 μGal=1×10−8 m/s2) after 3000 s integration time with a sampling rate of 0.25 Hz is achieved in this atom gravimeter. The relationship between the fringe contrast and the atom temperature in the atom gravimeter is studied; in addition, the wavefront aberration effect in the atom gravimeter is also investigated by varying the temperature of atoms.

Nassim Zahzam, Bruno Christophe, Alexandre Bresson +12 more