SMuK 2021 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 3: Classical GR-2

GR 3.3: Vortrag

Dienstag, 31. August 2021, 14:30–14:45, H6

Influence of the relativistic Frequency-Shift on Continuous Variable Quantum Key Distribution — •Roy Barzel and Claus Lämmerzahl — ZARM, Universität Bremen

Quantum-Key-Distribution (QKD) offers the possibility to exchange confidential information unconditionally secure between two or more parties, in the sense that the security of the protocol does not depend on the computational or material limitations of a potential adversary intending to break the key. Since the quantum repeater technology is still far from being applicable to intercontinental quantum communication in the short term satellite-based free-space links today look like the most promising solution to achieve long-distance QKD. Therefore space-qualified, robust optical components, that will allow for stable data flow of high performance are required. Only making use of approved standard telecommunication technology for state preparation and detection continuous variable quantum key distribution (CV-QKD) today is one of the most promissing ways of implementation of a globaly operating network of secure quantum communication. Apart from atmospheric distortion effects like absorbtion recent studies revealed the sensitivity of CV-QKD against relativistic effects like the relativistic Doppler-shift and the gravitational redshift. In this talk it is shown how to quantify the influence of relativistic effects on the performance of CV-QKD in a quantum field theoretical framework. Methods are shown how to derive analytic formulas for the secret key rates in CV-QKD protocolls between satellites and ground stations, which depend on the orbital parameters of the communicators.