Quantum Information Processing

, Volume 5, Issue 6, pp 537–558 | Cite as

A Double Well Interferometer on an Atom Chip

  • T. Schumm
  • P. Krüger
  • S. Hofferberth
  • I. Lesanovsky
  • S. Wildermuth
  • S. Groth
  • I. Bar-Joseph
  • L. M. Andersson
  • J. Schmiedmayer
Article

Radio-Frequency coupling between magnetically trapped atomic states allows to create versatile adiabatic dressed state potentials for neutral atom manipulation. Most notably, a single magnetic trap can be split into a double well by controlling amplitude and frequency of an oscillating magnetic field. We use this to build an integrated matter wave interferometer on an atom chip. Transverse splitting of quasi one-dimensional Bose–Einstein condensates over a wide range from 3 to 80 μm is demonstrated, accessing the tunnelling regime as well as completely isolated sites. By recombining the two split BECs in time of flight expansion, we realize a matter wave interferometer. The observed interference pattern exhibits a stable relative phase of the two condensates, clearly indicating a coherent splitting process. Furthermore, we measure and control the deterministic phase evolution throughout the splitting process. RF induced potentials are especially suited for integrated micro manipulation of neutral atoms on atom chips: designing appropriate wire patterns enables control over the created potentials to the (nanometer) precision of the fabrication process. Additionally, hight local RF amplitudes can be obtained with only moderate currents. This new technique can be directly implemented in many existing atom chip experiments.

Keywords

Atom waves atom interferometry Bose–Einstein condensation double well atom chips 

Pacs

03.75.-b 03.75.Nt 39.20+q 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • T. Schumm
    • 1
    • 2
    • 3
  • P. Krüger
    • 1
    • 4
  • S. Hofferberth
    • 1
  • I. Lesanovsky
    • 1
  • S. Wildermuth
    • 1
  • S. Groth
    • 1
  • I. Bar-Joseph
    • 5
  • L. M. Andersson
    • 1
    • 6
  • J. Schmiedmayer
    • 1
    • 2
  1. 1.Physikalisches InstitutUniversität HeidelbergHeidelbergGermany
  2. 2.Atominstitut Österreichischer UniversitätenViennaAustria
  3. 3.McLennan Physical LabsUniversity of TorontoOntarioCanada
  4. 4.Laboratoire Kastler BrosselÉcole Normale SupérieureParisFrance
  5. 5.Department of Condensed Matter PhysicsThe Weizmann Institute of ScienceRehovotIsrael
  6. 6.Department of Microelectronics and Information TechnologyThe Royal Institute of TechnologyKistaSweden

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