A qubit-photon controlled-NOT gate using a quantum dot strongly coupled to a cavity

ORAL

Abstract

Strong interactions between matter quantum bits (qubits) and photons play an essential role in quantum information. Quantum dots (QDs) provide a promising implementation of a matter qubit that can be strongly coupled to optical nanocavities, providing a direct light-matter interface. We use this light-matter interface to demonstrate a picosecond timescale controlled NOT logic gate between a QD and a photon, which is a fundamental building block for complex quantum logic. Coherent control of the QD qubit state by optical pulses results in a modification of cavity reflectivity, enabling a conditional bit-flip on the polarization state of a photon incident on the cavity.

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Authors

  • Hyochul Kim

    University of Maryland

  • Ranojoy Bose

    University of Maryland, Department of Electrical Engineering, University of Maryland, College Park, University of Maryland,College Park

  • Thomas Shen

    University of Maryland

  • Glenn S. Solomon

    Joint Quantum Institute, NIST, Joint Quantum Institute, University of Maryland and National Institute of Standards and Technology; National Institute of Standards and Technology, NIST-Gaithersburg, and Joint Quantum Institute, University of Maryland, College Park

  • Edo Waks

    University of Maryland, Department of Electrical Engineering, University of Maryland, College Park, University of Maryland, College Park