@article{2556,
  keywords = {pfc},
  author = {S. Ospelkaus and K.-K. Ni and Goulven Quéméner and B. Neyenhuis and D. Wang and M. de Miranda and John Bohn and Jun Ye and Deborah Jin},
  title = {Controlling the Hyperfine State of Rovibronic Ground-State Polar Molecules},
  abstract = {We report the preparation of a rovibronic ground-state molecular quantum gas in a single hyperfine state and, in particular, the absolute lowest quantum state. This addresses the last internal degree of freedom remaining after the recent production of a near quantum degenerate gas of molecules in their rovibronic ground state, and provides a crucial step towards full control over molecular quantum gases. We demonstrate a scheme that is general for bialkali polar molecules and allows the preparation of molecules in a single hyperfine state or in an arbitrary coherent superposition of hyperfine states. The scheme relies on electric-dipole, two-photon microwave transitions through rotationally excited states and makes use of electric nuclear quadrupole interactions to transfer molecular population between different hyperfine states.},
  year = {2010},
  journal = {Physical Review Letters},
  volume = {104},
  pages = {030402},
  month = {2010-01},
  issn = {0031-9007},
  doi = {10.1103/PhysRevLett.104.030402},
}