We present the first detector capable of recording high-bandwidth real time atom number density measurements of a Bose Einstein condensate. Based on a two-color Mach-Zehnder interferometer, our detector has a response time that is six orders of magnitude faster than current detectors based on CCD cameras while still operating at the shot-noise limit. With this minimally destructive system it may be possible to implement feedback to stabilize a Bose-Einstein condensate or an atom laser.
@article{arxiv.quant-ph/0508154,
title = {A detector for continuous measurement of ultra-cold atoms in real time},
author = {C. Figl and L. Longchambon and M. Jeppesen and M. Kruger and H. A. Bachor and N. P. Robins and J. D. Close},
journal= {arXiv preprint arXiv:quant-ph/0508154},
year = {2015}
}