Rydberg blockade of atomic ensemble qubits

ORAL

Abstract

We demonstrate \textbar W\textgreater state encoding of multi-atom ensemble qubits. Using optically trapped Rb atoms the T2 coherence time is 2.6(3) ms for an average ensemble number of N $=$ 7.6 atoms and scales approximately inversely with N. Strong Rydberg blockade between two ensemble qubits is demonstrated with a fidelity of 0.89(1) and a fidelity of $\sim $1.0 when postselected on control ensemble excitation. We will present progress towards entanglement of two ensemble qubits using the Rydberg blockade interaction.

*This work was funded by NSF grant PHY-1104531 and the AFOSR Quantum Memories MURI.

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Authors

  • Minho Kwon

    • University of Wisconsin

  • Matt Ebert

    • University of Wisconsin

  • Dahan Kim

    • University of Wisconsin

  • Thad Walker

    • University of Wisconsin-Madison
    • University of Wisconsin Madison
    • University of Wisconsin
    • University of Wisconsin, Madison

  • Mark Saffman

    • University of Wisconsin, Madison
    • Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706
    • Department of Physics, University of Wisconsin, Madison, WI.
    • University of Wisconsin
    • University of Wisconsin-Madison