stillingsbetegnelse:
PhD scholarships in Single-Photon Sources for Quantum Information Technology

jobbeskrivelse:
The Nanophotonics Theory & Signal Processing Group at DTU Fotonik, Department of Photonics Engineering at the Technical University of Denmark is seeking a candidate for a PhD position in the field of design and simulations of highly efficient solid-state sources of single indistinguishable photons. The position is funded by the Sapere Aude DFF Starting Grant “Linear Optics Quantum Information Technology (LOQIT) Solid-state sources of single photons are expected to play an important role in various quantum information applications, such as secure communications, quantum computation and metrology. These applications generally require near-unity efficiency and a high single-photon purity as well as indistinguishable photon emission. Furthermore, the ideal single-photon source (SPS) should be deterministic and not involve heralding or spontaneous downwards conversion. A potential platform for such a source is a quantum emitter, e.g. an InAs 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 additionally the emitted photons are subject to decoherence effects due to vibrations in the solid-state environment. A big challenge in realizing an efficient source is thus establishing control of the light emission. The PhD student will participate in a project team, which will design SPSs meeting all the requirements of the quantum information applications. The designs will be based on the photonic nanowire, the micropillar and the photonic crystal membrane platforms. The calculations will be performed using the modal method, representing state-of-the-art in optical simulations of single-photon sources. The fabrication and characterization of the sources will take place with external world-leading fabrication partners at CEA Grenoble, the University of Würzburg and at the Niels Bohr Institute. The team will be employing the modal method for the calculations, and the PhD student will initially work on on the construction of open geometry boundary conditions for the modal method. The formalisms will then be employed in the modeling tool used by the team to analyze and propose novel SPS designs which realize a good compromise between the simultaneous requirements of high indistinguishability, high efficiency and high purity while representing a robust and manufacturable design. The candidate is thus expected to •Analyze the limitations of current cavity- and waveguide-based single-photon source designs with respect to total efficiency and the coherence properties. •Propose new single-photon source designs overcoming these limitations to be fabricated by the external partners. •Construct modal-method simulation techniques implementing both semi-analytical and Fourier expansion descriptions of the eigenmodes. •Build open boundary formalisms converging towards the true open geometry limit for both the semi-analytical and the Fourier expansion descriptions. Qualifications The candidate should have a master's degree in engineering or a similar degree with an academic level equivalent to the master's degree in engineering. Additionally, the candidate must have passed an introductory course on quantum mechanics and also have previous experience with numerical simulations of physical problems. Approval and Enrolment The scholarship for the PhD degree is subject to academic approval, and the candidates will be enrolled in one of the general degree programs of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide. You can read more about Department of Photonics Engineering on http://www.fotonik.dtu.dk Assessment The assessment of the applicants will be made by Associate Professor Niels Gregersen and Professor Jesper Mørk. We offer We offer an interesting and challenging job in an international environment focusing on education, r

Arbejdsgiver Navn: Danmarks Tekniske Universitet

Arbejdsgiver telefonnummer: 45252525

Arbejdsgiver faxnummer: 45881225

Job kort beskrivelse:
Andet ingeniørarbejde (undtagen elektroteknologi)

land: Danmark

region: Hovedstaden

krævede uddannelse: Ikke angivet

Kilde til jobtilbud: AMS, Offentlige arbejdsformidlinger, Danmark