1 Quantum Photonics, Department of Photonics Engineering, Technical University of Denmark2 Department of Photonics Engineering, Technical University of Denmark3 Quantum Physics and Information Techology, Department of Physics, Technical University of Denmark4 Department of Physics, Technical University of Denmark5 Risø National Laboratory for Sustainable Energy, Technical University of Denmark
This thesis reports results on quantum properties of light in multiple-scattering nano-structured materials. Spatial quantum correlations of photons are demonstrated experimentally that are induced by multiple scattering of squeezed light and of purely quantum origin. By varying the quantum state of the light source, positive and negative spatial quantum correlations are observed. Angular-resolved measurements of multiply scattered photons show the innite range of the correlation function in the diusive regime. The multiply scattered light is characterized in frequency-resolved quantum noise measurements as well as in time-resolved photon-coincidence measurements and the experimental results are in excellent agreement with the quantum theory of multiple scattering. Probing the noise properties of light in the coherent backscattering cone reveals an enhancement factor of the multiply scattered photon uctuations that is larger than the predicted enhancement of the backscattered light intensity. Characterizing the quantum properties of multiply scattered light forms the basis for studies of quantum interference and quantum entanglement in disordered media. Anderson localization of light is demonstrated in disordered photonic crystal waveguides. Transmission measurements show that the localization length is strongly dispersive, allowing the control of one-dimensional Anderson localization of light. The statistical properties of Anderson localization are probed by embedding quantum dot light sources in disordered photonic crystal waveguides. From photoluminescence measurements, the spectral distribution of Anderson-localized modes is determined. Comparing the experimental data with one-dimensional analytical calculations provides a novel method to unambiguously distinguish Anderson localization from losses.