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Wednesday 24. January 2018

New Spectroscopic Methods in Quantum Photonics: Accessing Multiphoton Processes and Correlated Noise


Organisation: Max Planck Institute for the Science of Light / Sandoghdar Division

Speaker: Dr. Tomás Ramos, Spanish Research Council (CSIC), Madrid, Spain

Place: MPL / room A.1.500


We present new methods for characterizing multiphoton scattering processes and correlated dephasing noise in experiments with propagating photons. First, we provide a spectroscopic protocol to characterize the photon-photon interactions mediated by any photonic quantum device such as a single molecule in free space or in a waveguide [1]. The protocol relies on coherent state inputs and homodyne detection at the output and provides simultaneous information about multiple --elastic and inelastic-- segments of the scattering matrix. Finally, we show how correlated dephasing noise is manifested in the line shapes of quantum emitters and how the same information contained in standard time-resolved Ramsey experiments can be extracted spectroscopically.

[1] Multiphoton Scattering Tomography with Coherent States, T. Ramos, and J.J. García-Ripoll, Phys. Rev. Lett. 119, 153601 (2017).