丹麦技术大学招聘光子学设计与模拟方向博士后

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 Postdoc 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 candidate 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. A big challenge in realizing an efficient source is thus establishing control of the light emission.

Responsibilities and tasks

The Postdoc 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 Postdoc will initially work on the construction of a modal method implementing the features necessary for SPS analysis and design. The formalism will subsequently be employed by the team to analyze and propose novel SPS designs, that 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:

• Construct a modal method software package compatible with multiple eigenmode solvers and implementing support for Bloch-wave formalism, dipole emitters and parallelization.
• Supervise the development by PhD students of novel open boundary condition and adaptive spatial resolution formalisms.
• Employ the modal method to analyze and propose new single-photon source designs to be fabricated by the external partners.