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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 (Aarhus University)


Abstract :

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 [1], 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.


[1] Mølhave, K. and Drewsen, M. Phys. Rev. A 62, 011401 (2000).

[2] Poulsen G., PhD thesis: “Sideband Cooling of Atomic and Molecular Ions",

     Department of Physics and Astronomy, Aarhus University, 2011.

[3] Wan Y. et al., Phys. Rev. A 91, 043425 (2015).

[4] Rugango R. et al., New J. Phys. 17, 03009 (2015).

[5] Staanum, P. F. et al., Nat. Phys. 6, 271 (2010).

[6] Schneider, T. et al., Nat. Phys. 6, 275 (2010).

[7] Tong, X., Winney, A. H., and Willitsch, S., Phys. Rev. Lett. 105, 143001 (2010).

[8] Rellergert, W. G. et al., Nature 495, 490 (2013).

[9] Hansen A. K. et al., Nature 508, 76 (2014).

[10] Lien, C.-Y. et al., Nat. Commun. 5, 4783 (2014).

[11] Wolf, F. et al., Nature 530, 457 (2016).

[12] Chou, C.-W. et al., arXiv:1612.03926.


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