Zobrazeno 1 - 10
of 224
pro vyhledávání: '"Kjaergaard, N."'
Publikováno v:
Physical Review Applied 21, 044025 (2024)
We investigate the Autler-Townes splitting for Rydberg atoms dressed with linearly polarized microwave radiation, resonant with generic $S_{1/2}\leftrightarrow{P}_{1/2}$ and $S_{1/2}\leftrightarrow{P}_{3/2}$ transitions. The splitting is probed using
Externí odkaz:
http://arxiv.org/abs/2312.01974
Publikováno v:
Appl. Phys. Lett. 123, 144003 (2023)
We combine a rubidium vapor cell with a corner-cube prism reflector to form a passive RF transducer, allowing the detection of microwave signals at a location distant from the active components required for atomic sensing. This compact transducer} ha
Externí odkaz:
http://arxiv.org/abs/2306.15215
We demonstrate a method to reduce number fluctuations in an ultracold atomic sample using real-time feedback. By measuring the Faraday rotation of an off-resonant probe laser beam with a pair of avalanche photodetectors in a polarimetric setup we pro
Externí odkaz:
http://arxiv.org/abs/2102.01773
Publikováno v:
New Journal of Physics 22, 073017 (2020)
We experimentally and theoretically investigate in-medium propagation effects of off-resonant light in dense, spatially homogeneous ultacold atomic gases. Focussing on frequency modulation spectroscopy as the dispersive detection tool of atoms, we ob
Externí odkaz:
http://arxiv.org/abs/2002.10618
Publikováno v:
Review of Scientific Instruments 89, 103105 (2018)
We present a three-dimensional steerable optical tweezer system based on two pairs of acousto-optic deflectors. Radio frequencies used to steer the optical tweezers are generated by direct digital synthesis and multiple cross beam dipole traps can be
Externí odkaz:
http://arxiv.org/abs/1805.10574
Autor:
Deb, A. B., Kjærgaard, N.
Publikováno v:
Appl. Phys. Lett. 112, 211106 (2018)
We provide an experimental demonstration of a direct fiber-optic link for RF transmission ("radio-over-fiber") using a sensitive optical antenna based on a rubidium vapor cell. The scheme relies on measuring the transmission of laser light at an elec
Externí odkaz:
http://arxiv.org/abs/1803.09424
Publikováno v:
Journal of the Optical Society of America B, Vol. 29, Issue 11, pp. 3109-3113 (2012)
We describe a simple and compact architecture for generating all optical frequencies required for the laser cooling, state preparation and detection of atoms in an ultracold rubidium-87 experiment from a single 780 nm laser source. In particular, rep
Externí odkaz:
http://arxiv.org/abs/1209.4117
Publikováno v:
Optics Letters, Vol. 37, Issue 6, pp. 1085-1087 (2012)
We present first results on our implementation of a laser based accelerator for ultracold atoms. Atoms cooled to a temperature of 420 nK are confined and accelerated by means of laser tweezer beams and the atomic scattering is directly observed in la
Externí odkaz:
http://arxiv.org/abs/1112.3650
Autor:
Windpassinger, P. J., Kubasik, M., Koschorreck, M., Boisen, A., Kjaergaard, N., Polzik, E. S., Mueller, J. H.
We report on the performance of ultra low noise differential photodetectors especially designed for probing of atomic ensembles with weak light pulses. The working principle of the detectors is described together with the analysis procedures employed
Externí odkaz:
http://arxiv.org/abs/0903.3398
Publikováno v:
PNAS (7/2009) vol. 106 no. 27 10960-10965
Squeezing of quantum fluctuations by means of entanglement is a well recognized goal in the field of quantum information science and precision measurements. In particular, squeezing the fluctuations via entanglement between two-level atoms can improv
Externí odkaz:
http://arxiv.org/abs/0810.3545