Active SU(1,1) atom interferometry

• Verfasst von: Linnemann, Daniel [VerfasserIn]
• Verfasst von: Müssel, Wolfgang [VerfasserIn]
• Verfasst von: Kunkel, Philipp [VerfasserIn]
• Verfasst von: Prüfer, Maximilian [VerfasserIn]
• Verfasst von: Frölian, Anika [VerfasserIn]
• Verfasst von: Strobel, Helmut [VerfasserIn]
• Verfasst von: Oberthaler, Markus K. [VerfasserIn]
• Titel: Active SU(1,1) atom interferometry
• Verf.angabe: D. Linnemann, J. Schulz, W. Muessel, P. Kunkel, M. Prüfer, A. Frölian, H. Strobel and M.K. Oberthaler
• Fussnoten: Gesehen am 27.03.2018
• Titel Quelle: Enthalten in: Quantum science and technology
• Jahr Quelle: 2017
• Band/Heft Quelle: 2(2017,4) Artikel-Nummer 044009, ? Seiten
• ISSN Quelle: 2058-9565
• DOI: doi:10.1088/2058-9565/aa802c
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1571466924

Abstract

Active interferometers use amplifying elements for beam splitting and recombination. We experimentally implement such a device by using spin exchange in a Bose-Einstein condensate. The two interferometry modes are initially empty spin states that get spontaneously populated in the process of parametric amplification. This nonlinear mechanism scatters atoms into both modes in a pairwise fashion and generates a non-classical state. Finally, a matched second period of spin exchange is performed that nonlinearly amplifies the output signal and maps the phase onto readily detectable first moments. Depending on the accumulated phase this nonlinear readout can reverse the initial dynamics and deamplify the entangled state back to empty spin states. This sequence is described in the framework of SU(1,1) mode transformations and compared to the SU(2) angular momentum description of passive interferometers.