Academic Appointments


Administrative Appointments


  • Postdoctoral Research Fellow, Stanford University (2016 - 2019)

Professional Education


  • Dr. rer. nat., Leibniz Universität Hannover, Physics (2016)

Projects


All Publications


  • Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS-100) QUANTUM SCIENCE AND TECHNOLOGY Abe, M., Adamson, P., Borcean, M., Bortoletto, D., Bridges, K., Carman, S. P., Chattopadhyay, S., Coleman, J., Curfman, N. M., DeRose, K., Deshpande, T., Dimopoulos, S., Foot, C. J., Frisch, J. C., Garber, B. E., Geer, S., Gibson, V., Glick, J., Graham, P. W., Hahn, S. R., Harnik, R., Hawkins, L., Hindley, S., Hogan, J. M., Jiang, Y., Kasevich, M. A., Kellett, R. J., Kiburg, M., Kovachy, T., Lykken, J. D., March-Russell, J., Mitchell, J., Murphy, M., Nantel, M., Nobrega, L. E., Plunkett, R. K., Rajendran, S., Rudolph, J., Sachdeva, N., Safdari, M., Santucci, J. K., Schwartzman, A. G., Shipsey, I., Swan, H., Valerio, L. R., Vasonis, A., Wang, Y., Wilkason, T. 2021; 6 (4)
  • Large Momentum Transfer Clock Atom Interferometry on the 689 nm Intercombination Line of Strontium PHYSICAL REVIEW LETTERS Rudolph, J., Wilkason, T., Nantel, M., Swan, H., Holland, C. M., Jiang, Y., Garber, B. E., Carman, S. P., Hogan, J. M. 2020; 124 (8): 083604

    Abstract

    We report the first realization of large momentum transfer (LMT) clock atom interferometry. Using single-photon interactions on the strontium ^{1}S_{0}-^{3}P_{1} transition, we demonstrate Mach-Zehnder interferometers with state-of-the-art momentum separation of up to 141  ℏk and gradiometers of up to 81  ℏk. Moreover, we circumvent excited state decay limitations and extend the gradiometer duration to 50 times the excited state lifetime. Because of the broad velocity acceptance of the interferometry pulses, all experiments are performed with laser-cooled atoms at a temperature of 3  μK. This work has applications in high-precision inertial sensing and paves the way for LMT-enhanced clock atom interferometry on even narrower transitions, a key ingredient in proposals for gravitational wave detection and dark matter searches.

    View details for DOI 10.1103/PhysRevLett.124.083604

    View details for Web of Science ID 000517295000002

    View details for PubMedID 32167328

  • Atomic source selection in space-borne gravitational wave detection NEW JOURNAL OF PHYSICS Loriani, S., Schlippert, D., Schubert, C., Abend, S., Ahlers, H., Ertmer, W., Rudolph, J., Hogan, J. M., Kasevich, M. A., Rasel, E. M., Gaaloul, N. 2019; 21 (6)
  • Fast manipulation of Bose-Einstein condensates with an atom chip NEW JOURNAL OF PHYSICS Corgier, R., Amri, S., Herr, W., Ahlers, H., Rudolph, J., Guery-Odelin, D., Rasel, E. M., Charron, E., Gaaloul, N. 2018; 20
  • Matter-wave optics with Bose-Einstein condensates in microgravity Rudolph, J. Gottfried Wilhelm Leibniz Universität. Hannover. 2016

    Abstract

    Quantum sensors based on the interference of cold atoms have advanced to the forefront of precision measurements in geodesy, metrology and tests of fundamental physics. The ultimate potential of these devices is realized using quantum degenerate atoms in extended free fall. This can be achieved on microgravity platforms such as drop towers, parabolic flights, ballistic rockets, satellites and space stations. The transition to mobile and robust devices that can withstand the demands of these environments comes with many challenges. Quantum sensors need to be scaled down and integrated without compromising their performance. In fact, they need to significantly outpace conventional instruments, since microgravity time is an expensive resource and limited to a few seconds at a time on the most accessible platforms. This thesis describes the construction, qualification and operation of a miniaturized ultracold atom experiment that meets these challenges. The QUANTUS-2 apparatus features a payload weight of 147 kg and a payload volume of 0.3 m^3. It generates Bose-Einstein condensates of 4×10^5 ^87Rb atoms every 1.6 seconds, a flux of ultra-cold atoms that is on par with the best lab-sized devices. Ensembles of 1×10^5 atoms can be created at a 1 Hz rate. It is currently the fastest machine of its kind and achieves the highest atom number of any atom chip setup. The apparatus continuously withstands peak accelerations of up to 45 g during microgravity campaigns at the drop tower facility in Bremen, Germany. Here, the payload has accrued 208 drops and 9 catapult launches over 24 month. The setup is the first atom optics experiment to stand up to the technical demands of catapult operation. Four condensates can be created and observed consecutively during nine seconds of free fall in a single catapult launch. In total, the experiment has been suspended in microgravity for over 17 minutes. With the record source performance, the repetition rate for microgravity experiments with ultra-cold atoms was increased by a factor of four compared to previous devices. The total atom number was increased by a factor of 40, vastly improving the signal to noise ratio for absorption images of spatially extended clouds. The ensembles can be prepared consistently over many weeks of drop tower operation. The variance of the mean center of mass velocity in two observable directions is 7.3 μm/s and 6.9 μm/s. Magnetic lensing techniques were employed to manipulate the expansion of the ensembles. First results yield a residual expansion rate in three dimensions of σ_v = 116.9 ± 13.9 μm/s, which implies a three-dimensional effective temperature of T = 47.6 ± 11.3 pK at an average condensate atom number of N = 93000. These values constitute the best collimation of any atomic ensemble and the most promising source for atom interferometry reported to date. Optimizing the current lensing sequence will reduce the expansion rate further to effective temperatures in the femtokelvin regime. The level of control demonstrated over the condensates is highly relevant for the advancement of matter-wave optics and quantum sensors. Controlling the motion and size of atomic clouds is intrinsically tied to many systematic effects in high precision measurements. QUANTUS-2 will provide a platform to explore and mitigate these limitations on unprecedented time scales of up to seven seconds of free evolution.

  • A high-flux BEC source for mobile atom interferometers NEW JOURNAL OF PHYSICS Rudolph, J., Herr, W., Grzeschik, C., Sternke, T., Grote, A., Popp, M., Becker, D., Muentinga, H., Ahlers, H., Peters, A., Laemmerzahl, C., Sengstock, K., Gaaloul, N., Ertmer, W., Rasel, E. M. 2015; 17
  • Design of a dual species atom interferometer for space EXPERIMENTAL ASTRONOMY Schuldt, T., Schubert, C., Krutzik, M., Bote, L., Gaaloul, N., Hartwig, J., Ahlers, H., Herr, W., Posso-Trujillo, K., Rudolph, J., Seidel, S., Wendrich, T., Ertmer, W., Herrmann, S., Kubelka-Lange, A., Milke, A., Rievers, B., Rocco, E., Hinton, A., Bongs, K., Oswald, M., Franz, M., Hauth, M., Peters, A., Bawamia, A., Wicht, A., Battelier, B., Bertoldi, A., Bouyer, P., Landragin, A., Massonnet, D., Leveque, T., Wenzlawski, A., Hellmig, O., Windpassinger, P., Sengstock, K., von Klitzing, W., Chaloner, C., Summers, D., Ireland, P., Mateos, I., Sopuerta, C. F., Sorrentino, F., Tino, G. M., Williams, M., Trenkel, C., Gerardi, D., Chwalla, M., Burkhardt, J., Johann, U., Heske, A., Wille, E., Gehler, M., Cacciapuoti, L., Guerlebeck, N., Braxmaier, C., Rasel, E. 2015; 39 (2): 167–206
  • STE-QUEST-test of the universality of free fall using cold atom interferometry CLASSICAL AND QUANTUM GRAVITY Aguilera, D. N., Ahlers, H., Battelier, B., Bawamia, A., Bertoldi, A., Bondarescu, R., Bongs, K., Bouyer, P., Braxmaier, C., Cacciapuoti, L., Chaloner, C., Chwalla, M., Braxmaier, C., Cacciapuoti, L., Chaloner, C., Chwalla, M., Ertmer, W., Franz, M., Gaaloul, N., Gehler, M., Gerardi, D., Gesa, L., Guerlebeck, N., Hartwig, J., Hauth, M., Hellmig, O., Herr, W., Herrmann, S., Heske, A., Hinton, A., Ireland, P., Jetzer, P., Johann, U., Krutzik, M., Kubelka, A., Laemmerzahl, C., Landragin, A., Lloro, I., Massonnet, D., Mateos, I., Milke, A., Nofrarias, M., Oswald, M., Peters, A., Posso-Trujillo, K., Rasel, E., Rocco, E., Roura, A., Rudolph, J., Schleich, W., Schubert, C., Schuldt, T., Seidel, S., Sengstock, K., Sopuerta, C. F., Sorrentino, F., Summers, D., Tino, G. M., Trenkel, C., Uzunoglu, N., von Klitzing, W., Walser, R., Wendrich, T., Wenzlawski, A., Wessels, P., Wicht, A., Wille, E., Williams, M., Windpassinger, P., Zahzam, N. 2014; 31 (11)
  • Interferometry with Bose-Einstein Condensates in Microgravity PHYSICAL REVIEW LETTERS Muentinga, H., Ahlers, H., Krutzik, M., Wenzlawski, A., Arnold, S., Becker, D., Bongs, K., Dittus, H., Duncker, H., Gaaloul, N., Gherasim, C., Giese, E., Grzeschik, C., Haensch, T. W., Hellmig, O., Herr, W., Herrmann, S., Kajari, E., Kleinert, S., Laemmerzahl, C., Lewoczko-Adamczyk, W., Malcolm, J., Meyer, N., Nolte, R., Peters, A., Popp, M., Reichel, J., Roura, A., Rudolph, J., Schiemangk, M., Schneider, M., Seidel, S. T., Sengstock, K., Tamma, V., Valenzuela, T., Vogel, A., Walser, R., Wendrich, T., Windpassinger, P., Zeller, W., van Zoest, T., Ertmer, W., Schleich, W. P., Rasel, E. M. 2013; 110 (9): 093602

    Abstract

    Atom interferometers covering macroscopic domains of space-time are a spectacular manifestation of the wave nature of matter. Because of their unique coherence properties, Bose-Einstein condensates are ideal sources for an atom interferometer in extended free fall. In this Letter we report on the realization of an asymmetric Mach-Zehnder interferometer operated with a Bose-Einstein condensate in microgravity. The resulting interference pattern is similar to the one in the far field of a double slit and shows a linear scaling with the time the wave packets expand. We employ delta-kick cooling in order to enhance the signal and extend our atom interferometer. Our experiments demonstrate the high potential of interferometers operated with quantum gases for probing the fundamental concepts of quantum mechanics and general relativity.

    View details for DOI 10.1103/PhysRevLett.110.093602

    View details for Web of Science ID 000315380800006

    View details for PubMedID 23496709

  • Degenerate Quantum Gases in Microgravity MICROGRAVITY SCIENCE AND TECHNOLOGY Rudolph, J., Gaaloul, N., Singh, Y., Ahlers, H., Herr, W., Schulze, T. A., Seidel, S., Rode, C., Schkolnik, V., Ertmer, W., Rasel, E., Muentinga, H., Koenemann, T., Resch, A., Herrmann, S., Laemmerzahl, C., van Zoest, T., Dittus, H., Vogel, A., Wenzlawski, A., Sengstock, K., Meyer, N., Bongs, K., Krutzik, M., Lewoczko-Adamczyk, W., Schiemangk, M., Peters, A., Eckart, M., Kajari, E., Arnold, S., Nandi, G., Schleich, W. P., Walser, R., Steinmetz, T., Haensch, T. W., Reichel, J. 2011; 23 (3): 287–92
  • iSense: A Portable Ultracold-Atom-Based Gravimeter de Angelis, M., Angonin, M. C., Beaufils, Q., Becker, C., Bertoldi, A., Bongs, K., Bourdel, T., Bouyer, P., Boyer, V., Doerscher, S., Duncker, H., Ertmer, W., Fernholz, T., Fromhold, T. M., Herr, W., Krueger, P., Kuerbis, C., Mellor, C. J., Dos Santos, F., Peters, A., Poli, N., Popp, M., Prevedelli, M., Rasel, E. M., Rudolph, J., Schreck, F., Sengstock, K., Sorrentino, F., Stellmer, S., Tino, G. M., Valenzuela, T., Wendrich, T. J., Wicht, A., Windpassinger, P., Wolf, P., Giacobino, E., Pfeifer, R. ELSEVIER SCIENCE BV. 2011: 334–36