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“Towards Coherent Internal State Manipulation of a
Quantum State Prepared Single Molecular Ion”
Thursday, 19. Jan 2017
Video-Recording for any system with MP4-support
- Video.mp4 (ca.370 Mb)
15:15 – 16:15
Michael Drewsen (
Fully quantum state-prepared molecular ions are of interest for a wide range of research
fields, including ultra-cold chemistry, ultra-high resolution spectroscopy for test of
fundamental physics, and quantum information science. Cooling of the translational
degrees of freedom of trapped molecular ions into the millikelvin range has by become
routine through Coulomb interaction with simultaneously trapped and Doppler laser-cooled
atomic ions , and recently it has even become possible to prepare a single molecular ion
in its absolute ground state with respect to its quantized motion in the external trapping
potential [2-4]. With respect to the internal rovibrational degrees of freedom, significant
progress towards single quantum state preparation has as well recently been realized by a
series of complementary methods [5-12]. In the talk, a novel method for probabilistic
rotational state preparation of polar molecular ions based on consecutive partial projection
measurements will be discussed. Results of state preparation of vibrational cold single
MgH+ ions in the rotational ground or first excited state with maximum likelihood estimated
population of 0.98 and 0.95, respectively, will be presented, and the prospect of applying a
fs-laser frequency comb for direct spectroscopy and rotational state manipulating such
molecular ions will be discussed.
 Mølhave, K. and Drewsen, M. Phys. Rev. A 62, 011401 (2000).
 Poulsen G., PhD thesis: “Sideband Cooling of Atomic and Molecular Ions",
Department of Physics and Astronomy,
 Wan Y. et al., Phys. Rev. A 91, 043425 (2015).
 Rugango R. et al., New J. Phys. 17, 03009 (2015).
 Staanum, P. F. et al., Nat. Phys. 6, 271 (2010).
 Schneider, T. et al., Nat. Phys. 6, 275 (2010).
 Tong, X., Winney, A. H., and Willitsch, S., Phys. Rev. Lett. 105, 143001 (2010).
 Rellergert, W. G. et al., Nature 495, 490 (2013).
 Hansen A. K. et al., Nature 508, 76 (2014).
 Lien, C.-Y. et al., Nat. Commun. 5, 4783 (2014).
 Wolf, F. et al., Nature 530, 457 (2016).
 Chou, C.-W. et al., arXiv:1612.03926.
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