SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session III

HL 13.4: Poster

Tuesday, September 28, 2021, 13:30–16:30, P

On the Advantage of Sub-Poissonian Single Photon Sources in Quantum Communication — •Daniel Vajner, Timm Gao, and Tobias Heindel — Institute of Solid State Physics, Technical University Berlin, 10623 Berlin

Quantum Communication in principle enables a provably secure transmission of information. While the original protocols envisioned single photons as the quantum information carrier [1], nowadays implementations and commercial realizations make use of attenuated laser pulses. There are, however, a number of advantages of using single photon sources. They are not limited by the Poisson statistics and suffer less under finite-key length corrections [2]. In addition, the second order interference visibility of true single photons can exceed the classical value of 50% which will be benefitial for all quantum information processing schemes, as well as measurment device independent QKD schemes, that rely on Bell state measurements of photons from different sources [3]. Given recent advances in the development of engineered semiconductor QD-based light sources, harnessing these advantages is within reach. We present an overview of different scenarios in which employing single photon sources improves the communication rate and distance.

[1] Bennett et al. Proceedings of the IEEE International Conference on Computers, Systems and Signal Processing (1984)
[2] Cai et al. New Journal of Physics 11.4 (2009): 045024
[3] Mandel, L. Physical Review A 28.2 (1983): 929