PhD Scholarship in Design and Simulations of Quantum Light Sources

A new opening PhD position in sustainable development is available at Technical University of Denmark, Denmark. This position is available for 3 years. Applicants should apply before January 19, 2020.

The Quantum & Laser Photonics group at DTU Fotonik is seeking a candidate for a PhD position in the field of design and simulations of efficient sources of single indistinguishable photons. The position is offered within the framework of the H2020 MSCA Innovative Training Network "Quantum Dots for Photonic Quantum Information Technologies (QUDOT-TECH)" which will employ a total of 15 PhD students in five countries working in close collaboration on optical quantum information technologies (please , operational from around 20 September for more information about the network). You will participate in an international QUDOT-TECH project team, which will design and fabricate a fully integrated on-chip platform for optical quantum information processing including generation, manipulation and detection of single photons. Your overall task will be to design and perform numerical simulations of the quantum-dot single-photon source used to emit photons into the planar waveguides. Your project will take place in the Nanophotonics section at DTU Fotonik led by Prof. Jesper Mrk. The activities of the section are centred on the fabrication, characterization and theoretical analysis of opto-electronic components for use in information, communication and sensing applications.

For scalable optical quantum information processing, near-unity efficiency of the source is required, the emitted photons should be indistinguishable and, finally, the ideal single-photon source should be deterministic and not involve heralding or spontaneous downwards conversion. A promising platform for such a source is a quantum dot embedded in a semiconductor material. However, in a bulk material, the symmetry of the quantum dot leads to light emission in all directions, and the emitted photons are subject to decoherence effects due to vibrations in the solid-state environment. Consequently, a big challenge in realizing an efficient source is establishing control of the light emission. Your overall responsibility will be to perform numerical simulations of the optical field generated by photon emission from a quantum dot and to employ a series of optical engineering tools including cavity quantum electrodynamics, adiabatic transmission and dielectric screening effects to ensure near-unity coupling to the waveguide as well as near-unity indistinguishability in the presence of phonon-induced decoherence. You will perform calculations using the Fourier Modal Method, representing state-of-the-art in optical simulations of single-photon sources. The fabrication and characterization of the sources will take place at DTU, in Berlin and in Basel by your fellow QUDOT-TECH PhD students in a close feedback loop with you. You will be expected to The assessment of the applicants will be made by Assoc. Prof. Niels Gregersen and Prof. Jesper Mrk.

DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility. Candidates may apply prior to obtaining their master’s degree but cannot begin before having received it. In addition, candidates must be in the first four years (full-time equivalent research experience) of their research careers and not yet have been awarded a PhD degree.


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