Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Gases: Bosons II

Q 12.7: Vortrag

Montag, 23. März 2015, 16:00–16:15, P/H2

Realistic matter-wave interferometry with non-unitary operators — •Luis Fernando Barragán-Gil and Reinhold Walser — Institut für angewandte Physik, Technische Universität Darmstadt, Hochschulestr. 4a, 64289 Darmstadt

The realization of Bose-Einstein condensates in µ-gravity conditions, at the ZARM drop tower in Bremen by the QUANTUS collaboration [1,2] , has opened the possibility to measure corrections to local gravitational field of the Earth beyond the linear Earth’s acceleration (g) [3,4]. This is known as the gravity gradient correction and it is the next dominant contribution found in classical Newtonian Physics as well as in general relativistic view of gravity.

We use thermal ensembles and non-unitary operator formalism [5] (particle loss, temperature, realistic detector) to implement an atom interferometer in the presence of the harmonic corrections to the gravitational potential, and look for the effects of misalignment and temperature on the fringe pattern.

[1] Quantus Collaboration http://www.iqo.uni-hannover.de/quantus.html

[2] van Zoest, T. et al. Bose-Einstein Condensation in Microgravity, Science, 328, 1540-1543 (2010)

[3] Dimopoulos, S. et al. General Relativistic effects in atom interferometry, Phys. Rev. D, 78 042003 (2008)

[4] Kasevich, M. A. and Chu, S. Atom Interferometry Using Stimulated Raman Transitions, Phys. Rev. D, 67, 181-184 (1991)

[5] Balian, R. and Brezin, E. Nonunitary Bogoliubov Transformations and Extension of Wick’s Theorem Nuovo Cimento, LXIV B, 1 (1969)