Ghost Polarization Communication: From the foundations of quantum optics to a secure communication scheme based on classical photon correlations
We start with the Hanbury-Brown & Twiss experiment form 1956 conceived to improve the measurements for the determination of star diameters. The discovery of photon bunching of classical thermal light sources set the foundation of quantum optics even before the advent of the first laser. Based on this photon bunching concept with its intensity correlations, we develop as a first correlated photon metrology scheme ghost imaging with light emitted by semiconductor-based super-luminescent diodes. After this illustration of the concept of classical correlations of thermal light for ghost metrology, we then proceed to polarization correlations of light emitted by an erbium-doped fiber amplifier. The observed correlations of the Stokes vector are exploited towards the realization of a secure communication scheme between two parties, Alice and Bob, in analogy to quantum communication, however, now based on the ultrafast polarization dynamics of unpolarized light on the Poincaré sphere. We conclude by discussing aspects, advantages and further perspectives of classical ghost metrology.
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- 19 place Marguerite Perey
- Palaiseau, Ile-de-France
- France 91120
- Room Number: AMPHI 3
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Speakers
Prof. Dr. Wolfgang Elsäßer
Biography:
Wolfgang Elsäßer was born in Pforzheim, Germany in 1954. He received the diploma degree in Physics from the Technical University of Karlsruhe in 1980, the Ph.D. degree in Physics from the University in Stuttgart in 1984, and a Habilitation degree in Experimental Physics from the Philipps-University Marburg in 1991. From 1981 to 1985, he was with the Max-Planck-Institute for Solid State Research Stuttgart. From 1985 to 1995, he was with the Philipps-University Marburg. Since 1995, he is Full Professor in the Institute of Applied Physics, Darmstadt University of Technology, Germany working in the field of Semiconductor Optics.
In 2021, he has been nominated Adjunct Professor at the School of Physics at Trinity College Dublin and in 2022 Associato al Istituto di elettronica e di ingegneria dell' informazione e delle telecomunicazioni del CNR (IEIIT-CNR) in Torino, Italia. He is a member of the German Physical Society (DPG), Member of the European Physical Society (EPS) and actually elected member of the council of the EPS and a Senior Member of IEEE. He was awarded with the Otto-Hahn-Medal (1985), the Werner-von-Siemens-Medal (1985), the Rudolf-Kaiser Prize (1991) and the IEE J.J. Thomson Premium (1995).
His research interests can be best described by “Photonics and Quantum Optics of Semiconductor Emitters”.
Address:Technische Universität Darmstadt, , Germany