Decoherence-free subspaces in BEC interferometry

We extend an approach originally developed to describe Bragg interferometry of Bose-Einstein condensates [1], to describe new interferometers based on quantum information concepts. This approach follows ideas recently introduced in neutron interferometry, such as the identification of decoherence free (DF) subspaces to reduce mechanical noise [2,3]. Using techniques that have been well calibrated by experiments in conventional BEC interferometry [1], we prototype extensions to standard Mach-Zehnder configurations, analogous to the four- and five-blade DF designs of neutron interferometry [2,3]. \\[4pt] [1] J. E. Simsarian, {\em et al.}, {\em Phys. Rev. Lett.} {\bf 85}, 2040 (2000) \newline [2] D. A. Pushin, M. Arif, and D. G. Cory, {\em Phys. Rev. A} {\bf 79}, 053635, (2009) \newline [3] ``A vibrational decoupled neutron interferometer,'' D. A. Pushin, {\em et al.} (preprint)