2 results for Aoki, T

  • A photon turnstile dynamically regulated by one atom

    Dayan, B; Parkins, Andrew; Aoki, T; Ostby, EP; Vahala, KJ; Kimble, HJ (2008)

    Journal article
    The University of Auckland Library

    Beyond traditional nonlinear optics with large numbers of atoms and photons, qualitatively new phenomena arise in a quantum regime of strong interactions between single atoms and photons. By using a microscopic optical resonator, we achieved such interactions and demonstrated a robust, efficient mechanism for the regulated transport of photons one by one. With critical coupling of the input light, a single atom within the resonator dynamically controls the cavity output conditioned on the photon number at the input, thereby functioning as a photon turnstile. We verified the transformation from a Poissonian to a sub-Poissonian photon stream by photon counting measurements of the input and output fields. The results have applications in quantum information science, including for controlled interactions of single light quanta and for scalable quantum processing on atom chips.

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  • Observation of strong coupling between one atom and a monolithic microresonator

    Aoki, T; Dayan, B; Wilcut, E; Bowen, WP; Parkins, Andrew; Kippenberg, TJ; Vahala, KJ; Kimble, HJ (2006)

    Journal article
    The University of Auckland Library

    Over the past decade, strong interactions of light and matter at the single-photon level have enabled a wide set of scientific advances in quantum optics and quantum information science. This work has been performed principally within the setting of cavity quantum electrodynamics with diverse physical systems5, including single atoms in Fabry–Perot resonators1, quantum dots coupled to micropillars and photonic bandgap cavities and Cooper pairs interacting with superconducting resonators. Experiments with single, localized atoms have been at the forefront of these advances11, 12, 13, 14, 15 with the use of optical resonators in high-finesse Fabry–Perot configurations16. As a result of the extreme technical challenges involved in further improving the multilayer dielectric mirror coatings of these resonators and in scaling to large numbers of devices, there has been increased interest in the development of alternative microcavity systems5. Here we show strong coupling between individual caesium atoms and the fields of a high-quality toroidal microresonator. From observations of transit events for single atoms falling through the resonator's evanescent field, we determine the coherent coupling rate for interactions near the surface of the resonator. We develop a theoretical model to quantify our observations, demonstrating that strong coupling is achieved, with the rate of coherent coupling exceeding the dissipative rates of the atom and the cavity. Our work opens the way for investigations of optical processes with single atoms and photons in lithographically fabricated microresonators. Applications include the implementation of quantum networks scalable quantum logic with photons and quantum information processing on atom chips.

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