Increasing the Coherence Time in a Magnetic Stimulated Raman Transition in $^{85}$Rb

ORAL

Abstract

We experimentally study, compare and contrast Ramsey and spin echo pulse sequence protocols in a cold $^{85}$Rb gas. Our measurements, performed in an {\em unshielded} metal vacuum canister, are dominated by laboratory noise. Both Ramsey and spin echo show a decay of the interference in about $100\, \mu $sec, while we have found that changing the axis of rotation of the echo pulse by $90^{\circ}$ can increase coherence time by nearly a factor of $10$. These results show that this new pulse sequence can be used in our system to reduce dephasing on magnetic transitions.

*Grateful for funding from ONR

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Authors

  • Sara A. DeSavage

    • Department of Physics, University of Maryland, Baltimore County, Baltimore, MD 21250 USA

  • Danielle A. Braje

    • RF and Quantum Systems Technology Group, MIT Lincoln Laboratory, Lexington, MA 02420 USA

  • Jon P. Davis

    • Naval Air Systems Command, EO Sensors Division, Bldg 2187, Suite 3190, 48110 Shaw Road, Patuxent River, MD 20670 USA
    • Naval Air Systems Command

  • Frank A. Narducci

    • Naval Air Systems Command, EO Sensors Division, Bldg 2187, Suite 3190, 48110 Shaw Road, Patuxent River, MD 20670 USA
    • EO Sensors Division - US Naval Air Systems Command
    • Naval Air Systems Command