Challenges of Laser Cooling Molecular Ions
Speaker: Kenneth R. Brown, Georgia Institute of Technology
Series: Topical Seminars
Location: Bowen Hall Auditorium
Date/Time: Monday, April 11, 2011, 12:30 p.m. - 1:30 p.m.
A scalable quantum computer would redefine the field of theoretical chemistry by allowing the efficient calculation of molecular energies. Current quantum information hardware is limited by short coherence times due to both system-environment coupling and imperfections in controls. My group is currently pursuing two directions: scaling ion-trap quantum computers and using unscalable ion-trap technologies as sensitive detectors. In this talk I will present our work towards laser-cooling molecular ions using techniques from ion-trap quantum computing.
Recent demonstration of the laser cooling of SrF opens the possibility of laser-cooling molecular ions . The long trap lifetime of molecular ions allows for a wider array
of cooling schemes, but also requires careful consideration of slow molecular processes. I will present results numerically examining the feasibility of laser-cooling AlH+ and BH+ . I will describe a potential experiment using BH+ sympathetically cooled by Ca+ and explain how quantum logic spectroscopy  and sympathetic heating spectroscopy  can be used to measure the molecular ion spectra with suﬃcient resolution for laser cooling.
 E. S. Shuman, J.F. Barry, and D. DeMille, Nature 467, 820 (2010).
 J.H.V. Nguyen, C.R. Viteri, E.G. Hohenstein, C.D. Sherrill, K.R. Brown, and B. Odom, arXiv:1102.3368
 P. O. Schmidt, T. Rosenband, C. Langer, W. M. Itano, J. C. Bergquist, and D. J. Wineland, Science 309, 749 (2005).
 C.R. Clark, J.E. Goeders, Y.K. Dodia, C.R. Viteri, and K.R. Brown, Phys. Rev. A 81, 043428 (2010)