title: Verifying quantum superpositions at metre scales.
authors: Department of Physics, University of California, Berkeley, California 94720, USA.|Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors: D M
authors: DM
authors: Stamper-Kurn
authors: JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309, USA.
authors: G E
authors: GE
authors: Marti
authors: Department of Physics, University of California, Berkeley, California 94720, USA.
authors: H
authors: H
authors: Müller