[1] Leibniz Univ Hannover, Inst Quantenopt, Welfengarten 1, D-30167 Hannover, Germany
[2] Leibniz Inst Hochstfrequenztech, Ferdinand Braun Inst, Gustav Kirchhoff Str 4, D-12489 Berlin, Germany
[3] Leibniz Univ Hannover, Inst Mikroelekt Syst, Appelstr 4, D-30167 Hannover, Germany
[4] Univ Bremen, ZARM, Fallturm 2, D-28359 Bremen, Germany
[5] German Aerosp Ctr Space Syst, DLR RY, Linzerstr 1, D-28359 Bremen, Germany
[6] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[7] Univ Ulm, Inst Quantenphys, Albert Einstein Allee 11, D-89069 Ulm, Germany
[8] Univ Ulm, Ctr Integrated Quantum Sci & Technol IQST, Albert Einstein Allee 11, D-89069 Ulm, Germany
[9] German Aerosp Ctr DLR, Inst Quantum Technol, Soflinger Str 100, D-89077 Ulm, Germany
[10] Leibniz Univ Hannover, German Aerosp Ctr DLR, Inst Satellite Geodesy & Inertial Sensing, Welfengarten 1, D-30167 Hannover, Germany
[11] Fierlinger Magnet GmbH, Rathauspl 2, D-85748 Garching, Germany
[12] German Aerosp Ctr DLR, Inst Software Technol, Lilienthalpl 7, D-38108 Braunschweig, Germany
[13] Humboldt Univ, AG Opt Metrol, Newtonstr 15, D-12489 Berlin, Germany
[14] Univ Hamburg, Inst Laserphys, Luruper Chaussee 149, D-22761 Hamburg, Germany
[15] Univ Bremen, German Aerosp Ctr DLR, Inst Satellite Geodesy & Inertial Sensing, Fallturm 9, D-28359 Bremen, Germany
[16] Bates Coll, Dept Phys & Astron, Lewiston, ME 04240 USA
[17] Johannes Gutenberg Univ Mainz, Inst Phys, Staudingerweg 7, D-55128 Mainz, Germany
[18] Univ Calif Berkeley, Dept Phys, 366 LeConte HallMC 7300, Berkeley, CA 94720 USA
[19] Texas A&M Univ, Hagler Inst Adv Study, College Stn, TX 77843 USA
[20] Texas A&M Univ, Dept Phys & Astron, Inst Quantum Sci & Engn IQSE, Texas A&M AgriLife Res, College Stn, TX 77843 USA
[21] Airbus Def & Space, Willy Messerschmitt Str 1, D-82024 Taufkirchen, Germany
[22] Space Dynam Lab, Albuquerque, NM 87106 USA