Atom Interferometry on Atom Chips - A Novel Approach Towards Precision

We have proposed and experimentally demonstrated a new technique for creating spin squeezed states of distant atoms by their common interaction with a driven resonator mode. Using this technique we achieve the largest spin squeezing to date, 5.6dB of improvement in signal-to-noise ratio over the standard quantum limit. We have demonstrated a squeezed atomic clock that reaches a given precision a factor of 2.8 faster than a clock operating at the standard quantum limit. Furthermore we have experimentally demonstrated that an atom-optics kicked rotor can remove the interference signal due to chosen interferometer paths in a four-pulse atom interferometer. The interferometer output is dominated by two degenerate spatial loops: the nonreciprocal “trapezoid” loop and the reciprocal “figure-8” loop. By applying the kicked rotor sequence at a particular time we suppressed the contribution of the “trapezoid” loop to the interferometer signal while preserving the contribution due to the “figure-8” loop. We have also demonstrated a robust “macro-chip” as a guide for stationary interferometer and investigated the properties of such interferometer. (a) Papers published in peer-reviewed journals (N/A for none) 1. J. Simon, H. Tanji, J. K. Thompson, and V. Vuletic, Interfacing Collective Atomic Excitations and Single Photons, Phys. Rev. Lett. 98, 183601 (2007). 2. Single-Photon Bus between Spin-Wave Quantum Memories. J. Simon, H. Tanji, S. Ghosh, and V. Vuletic, Nature Physics 3, 765-769 (2007). 3. Wu S, Su E, Prentiss M, Demonstration of an area-enclosing guided-atom interferometer for rotation sensing, Phys. Rev. Lett. 99, 173201 (2007). 4. Heralded Single-Magnon Quantum Memory for Photon Polarization States. H. Tanji, S. Ghosh, J. Simon, B. Bloom, and V. Vuletic, Phys. Rev. Lett. 103, 043601 (2009); selected as Editors’ Suggestion, accompanying Viewpoint commentary Physics 2, 62 (2009). 5. Heralded atomic-ensemble quantum memory for photon polarization states. J. Simon, H. Tanji, S. Ghosh, B. Bloom, and V. Vuletic, Phys. Scr. T134, 014010 (2009). 6. Selective Manipulation of Degenerate Interferometer Loops by an Atom-Optics Kicked Rotor. A. Tonyushkin and M. Prentiss, Phys. Rev. A 78, 053625 (2008). 7. Demonstration of multipulse interferometer for quantum kicked-rotor studies. A. Tonyushkin, S. Wu, and M. Prentiss, Phys. Rev. A 79, 051402(R) (2009); selected to Virtual Journal of Ultrafast Science, 8 (6). 8. Observation of saturation of fidelity decay with an atom interferometer. S. Wu, A. Tonyushkin, and M. Prentiss, Phys. Rev. Lett. 103, 034101 (2009). 9. Implementation of Cavity Squeezing of a Collective Atomic Spin. I.D. Leroux, M. Schleier-Smith, and V. Vuletic, Phys. Rev. Lett. 104, 073602 (2010); selected as Editors’ Suggestion. 10. States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty. M. H. Schleier-Smith, I.D. Leroux, and V. Vuletic, Phys. Rev. Lett. 104, 073604 (2010). 11. Squeezing the Collective Spin of a Dilute Atomic Ensemble by Cavity Feedback. M. Schleier-Smith, I.D. Leroux, and V. Vuletic, Phys. Rev. A 81, 021804(R) (2010). List of papers submitted or published that acknowledge ARO support during this reporting period. List the papers, including journal references, in the following categories: (b) Papers published in non-peer-reviewed journals or in conference proceedings (N/A for none) 1. Simplified measurement of the Bell parameter of two photons within quantum mechanics. H. Tanji, J. Simon, S. Ghosh, and V. Vuletic, quant-phys/08014549 (1/2008). 2. Nonclassical States of Cold Atomic Ensembles and of Light Fields. V. Vuletic, RLE Progress Report 149, Chapter 35 (2008). 3. Observation of coherence revival and fidelity saturation in a delta-kicked rotor potential. S. Wu, A. Tonyushkin, M. Prentiss, arXiv:0801.0475. 11.00 Number of Papers published in peer-reviewed journals: Number of Papers published in non peer-reviewed journals: about 15 presentations (c) Presentations 3.00 Number of Presentations: 15.00 Non Peer-Reviewed Conference Proceeding publications (other than abstracts): 1. Spin Squeezing on an Atomic Clock Transition. M. H. Schleier-Smith, I. D. Leroux, and V. Vuletic, published in: Proceedings of the XXI. International Conference on Atomic Physics (ICAP 2008, Storrs, Connecticut, 7/2008), edited by R. Côté, P.L Gould, M. Rozman, and W.W. Smith (World Scientific 2009). Number of Non Peer-Reviewed Conference Proceeding publications (other than abstracts): 1 Peer-Reviewed Conference Proceeding publications (other than abstracts): 1. Probing quantum chaos with periodically perturbed de Broglie wave atom interferometer. A. Tonyushkin and M. Prentiss, published in: Proceedings of International Laser Physics Workshop. Barcelona, Spain (Jul, 2009). 2. Spin Squeezing on an Atomic Clock Transition. M. H. Schleier-Smith, I. D. Leroux, and V. Vuletic, published in: Proceedings of the XXI. International Conference on Atomic Physics (ICAP 2008, Storrs, Connecticut, 7/2008), edited by R. Côté, P.L Gould, M. Rozman, and W.W. Smith (World Scientific 2009). 3. Coherence modulation at quantum resonances of delta-kicked rotor. A. Tonyushkin, M. Hafezi, S. Wu, and M. Prentiss, published in: Proceedings of the XXI. International Conference on Atomic Physics (ICAP 2008, Storrs, Connecticut, 7/2008), edited by R. Côté, P.L Gould, M. Rozman, and W.W. Smith (World Scientific 2009). 4. Perfect Coherence Preservation in an Atom Interferometer Perturbed by Optical Standing Wave Pulses Acting as a Kicked Rotor. A. Tonyushkin, S. Wu, and M. Prentiss, proceedings of Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference, San Jose, CA (2008), Technical Digest (OSA, Washington, DC, 2008) 5. Observation of Fidelity Saturation in a ?-Kicked Rotor Potential. S. Wu, A. Tonyushkin, and M. Prentiss, proceedings of Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference, San Jose, CA (2008), Technical Digest (OSA, Washington, DC, 2008) (d) Manuscripts Number of Peer-Reviewed Conference Proceeding publications (other than abstracts): 5 Number of Manuscripts: 0.00