J. Grond, U. Hohenester, I. Mazets, H.-J. Schmiedmayer:

"Atom interferometry with trapped Bose-Einstein condensates: impact of atom-atom interactions";

New Journal of Physics,12(2010), 065036; S. 1 - 29.

Interferometry with ultracold atoms promises the possibility of

ultraprecise and ultrasensitive measurements in many fields of physics, and is

the basis of our most precise atomic clocks. Key to a high sensitivity is the

possibility to achieve long measurement times and precise readout. Ultracold

atoms can be precisely manipulated at the quantum level and can be held for very

long times in traps; they would therefore be an ideal setting for interferometry.

In this paper, we discuss how the nonlinearities from atom-atom interactions,

on the one hand, allow us to efficiently produce squeezed states for enhanced

readout and, on the other hand, result in phase diffusion that limits the phase

accumulation time. We find that low-dimensional geometries are favorable,

with two-dimensional (2D) settings giving the smallest contribution of phase

diffusion caused by atom-atom interactions. Even for time sequences generated

by optimal control, the achievable minimal detectable interaction energy ΔE^{min}is of the order of 10−4μ, where μ is the chemical potential of the Bose-Einstein

condensate (BEC) in the trap. From these we have to conclude that for more

precise measurements with atom interferometers, more sophisticated strategies,

or turning off the interaction-induced dephasing during the phase accumulation

stage, will be necessary.

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http://dx.doi.org/10.1088/1367-2630/12/6/065036

http://publik.tuwien.ac.at/files/PubDat_187451.pdf

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.