RESEARCH FIELDPhysics › Mathematical physicsPhysics › Optics
RESEARCHER PROFILERecognised Researcher (R2)
APPLICATION DEADLINE08/03/2020 23:00 - Europe/Brussels
LOCATIONDenmark › Kongens Lyngby
TYPE OF CONTRACTTemporary
HOURS PER WEEK37
OFFER STARTING DATE01/05/2020
EU RESEARCH FRAMEWORK PROGRAMMEH2020 / ERC
IS THE JOB RELATED TO STAFF POSITION WITHIN A RESEARCH INFRASTRUCTURE?Yes
The Quantum and Laser Photonics Group at DTU Fotonik, Department of Photonics Engineering at the Technical University of Denmark, is seeking candidates for Postdoc positions in the field of design and simulations of highly efficient solid-state sources of single indistinguishable photons. The positions are offered with support from the Independent Research Fund Denmark and from the European Research Council.
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. A promising platform for a deterministic SPS is based on the semiconductor quantum dot (QD) in a solid-state environment. However, for a QD in a bulk material, the symmetry of the quantum dot leads to light emission in all directions, and furthermore the QD interacts with the solid-state environment leading to decoherence due to phonons and fluctuating charges. A major challenge in realizing a SPS is thus to establish control of the light emission.
Responsibilities and tasks
The Postdoc will participate in a project team with several Postdocs and PhD students, which will design and fabricate SPSs meeting all the requirements of the quantum information applications. The structures to be investigated include both vertically emitting structures (micropillars, photonic nanowires) and on-chip designs with in-plane emission (ridge waveguides). The fabrication and characterization of the vertically emitting sources will take place in-house, whereas the on-chip designs will be fabricated at the Technical University of Berlin. The activity benefits from synergy with the H2020 MSCA Innovative Training Network “Quantum Dots for Photonic Quantum Information Technologies (QUDOT-TECH)” (http://www.qudot-tech.eu/) coordinated by DTU Fotonik.
The optical simulations will be performed using the modal method, representing state-of-the-art in optical simulations of single-photon sources. While the method offers great insight into the governing physics, convergence is not easily obtained in particular for the planar structures, and we may rely on additional simulation methods, e.g. finite elements modelling. In addition, the indistinguishability of the emitted photons in the presence of phonon-induced decoherence mechanisms will be calculated using an open quantum system master equation approach.
The overall responsibility of the postdoc is to set up the numerical simulations framework to be used in the analysis of high-performance SPSs in collaboration with the PhD students, who will focus on the design work itself. In a collaborative effort, the team will analyse and propose novel SPS designs allowing for a good compromise between offering high performance and representing a robust design compatible with fabrication constraints. The tasks for the postdoc include setting up a modal method to be used both for vertical and in-plane designs and improving the performance of the code e.g. by implementing support for parallelization. Furthermore, the postdoc will build codes for the analysis of the photon indistinguishability. Additional responsibility of the postdoc includes supervision of the PhD students working on the theory and the designs and of MSc and BSc students associated with the project.
REQUIRED EDUCATION LEVELPhysics: PhD or equivalent
The candidate should have
- Knowledge of quantum optics.
- Knowledge of cavity quantum electrodynamics and of quantum emitters in nanophotonic structures.
- Experience with numerical simulations of the electromagnetic field.
- Experience with Matlab, Python or a similar scientific programming language.
- Previous experience with the Modal Method (e.g. Fourier Modal Method, Differential Method, Eigenmode Expansion Technique) or a similar modal expansion technique is recommended.
- Willingness to work in close collaboration with an internal project team consisting both of theoreticians and experimentalists.
- Willingness to supervise PhD, MSc and BSc students.
EURAXESS offer ID: 495432
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