Lecture by Assoc. Prof. Rinaldo Trotta

Title: GaAs Quantum Dots for Quantum Networking

Assoc. Professor Rinaldo Trotta
Department of Physics, Sapienza University of Rome, Italy
Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Austria

Nowadays, the majority of quantum optics experiments involving semiconductor-based quantum emitters are performed with Stranksi-Krastanow InGaAs quantum dots (QDs). This material system has been instrumental in the fabrication of near-optimal single photon sources and it is considered to be an “established choice”. However, the performances of InGaAs QDs as sources of entangled photons have not yet reached the levels required for practical quantum networking.

In this talk, I will focus on a system that has received limited attention so far: GaAs QDs fabricated by droplet etching. After a brief introduction on the general properties of these QDs, I will show how they can generate highly indistinguishable photon pairs on-demand [1], with unprecedented purity [2], and with a near-ideal degree of entanglement [3]. Then, I will present our first steps towards the construction of a QD-based quantum network: I will discuss how photons from the same QD can be used to experimentally demonstrate unconditional quantum teleportation [4], and I will present quantum interference experiments with photons emitted by two distant QDs [5]. A discussion on future perspectives will conclude the talk.

[1] D. Huber, et al., Nature Communications 8, 15506 (2017)
[2] L. Schweickert, et al., Appl. Phys. Lett. 112, 093106 (2018)
[3] D. Huber, et al., . https://arxiv.org/abs/1801.06655 (to appear in Phys. Rev. Lett.) (2018)
[4] M. Reindl, et al., submitted. (2018)
[5] M. Reindl, et al., Nano Letters 17, 4090 (2017)


Thu 21 Jun 18
13:00 - 14:00


DTU Fotonik


Lyngby Campus
Building 303A, aud. 41