Research ArticleQUANTUM PHYSICS

Cavity-enhanced coherent light scattering from a quantum dot

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Science Advances  22 Apr 2016:
Vol. 2, no. 4, e1501256
DOI: 10.1126/sciadv.1501256

Figures

  • Fig. 1 Resonant excitation of a quantum dot in a microcavity.

    (A) Experimental arrangement. (B) Scanning electron microscopy image of a pillar microcavity. (C) Energy level diagram with the resonant driving field Er coupled to the X+ transition. Resonant emission (RE) can be gated with the weak nonresonant laser, En, which creates electron-hole pairs in the GaAs bandgap. Following hole capture in the dot (dashed arrow), the X+ transition may be resonantly driven. (D) Power dependence of the source intensity as a function of the coherent laser intensity, with and without additional excitation by the weak nonresonant laser, En.

  • Fig. 2 Cavity-enhanced resonant Rayleigh scattering (RRS).

    (A) Autocorrelation measurement at a Rabi frequency of 0.83 GHz and (B) spectrum of the emitted light at the same power (black data points) with instrument resolution (red). (C) The power dependence of the emission (black) shown as a function of Rabi frequency. From this, the proportion of the light due to RRS is calculated for T2/2T1 = 1.0 and 0.3. (D) Postselected Hong-Ou-Mandel autocorrelation for parallel (red) and orthogonal (black) photon polarizations. (E) Interference visibility deduced from (D), fitted with different values of T2/2T1.

  • Fig. 3 Deterministic excitation to create on-demand indistinguishable photons and N00N states.

    (A) Schematic of the photonic chip used to generate a two-photon N00N state from two single photons. (B) Autocorrelation measurement under pulsed excitation with two laser pulses separated by 2.36 ns. (C) Two-photon interference between consecutive single photons with parallel (black) and orthogonal (red) polarization. (D) The variation in the single-photon detection rate at the output of the photonic chip as a function of phase, φ. (E) The two-photon coincidence detection rate at the output of the photonic chip as a function of phase, φ.

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