Please use this persistent identifier to cite or link to this item:
doi:10.24405/14215
Title: | System Approaches for a Practical Implementation of Continuous-Variable Quantum Key Distribution Using Coherent Heterodyne Detection | Authors: | Kleis, Sebastian | Language: | eng | Keywords: | Optical Fiber Communication;CV-QKD;Quantum Cryptography;Heterodyne Detection;Carrier Phase Estimation;Bayesian Inference | Subject (DDC): | 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten | Issue Date: | 2022 | Publisher: | Universitätsbibliothek der HSU/UniBwH | Document Type: | Thesis | Publisher Place: | Hamburg | Abstract: | Public key cryptography is a cornerstone of today’s private communication. As quantum computing is a major threat for the privacy of public key cryptography, the development of appropriate alternatives is of critical importance. One promising alternative to achieve security against quantum computer attacks is symmetric encryption, whereby the secret key is established using quantum key distribution (QKD). Especially interesting for a wide application are continuous-variable QKD (CV-QKD) systems, as these can potentially be implemented using standard components of coherent optical communications. However, a major challenge for implementing CV-QKD is to achieve phase noise mitigation of the optical quantum signal with a received power of less than 1 photon per symbol. In this thesis, two different approaches for implementing CV-QKD systems and to overcome this challenge are proposed and investigated. To achieve phase noise mitigation, a key element of both systems is the use of Bayesian inference methods in the digital signal processing. Both systems rely on standard components and are therefore promising for a practical implementation. Based on the experimental results, the suitability for CV-QKD is confirmed, limiting factors are identified and the achievable performance is discussed. Additionally, the compatibility of CV-QKD with existing optical networks is investigated based on system experiments with a CV-QKD channel embedded in a commercial C band WDM system. |
Organization Units (connected with the publication): | Hochfrequenztechnik | DOI: | https://doi.org/10.24405/14215 | Advisor: | Schäffer, Christian G. | Referee: | Silberhorn, Christine | Grantor: | HSU Hamburg | Type of thesis: | Doctoral Thesis | Exam date: | 2021-10-05 |
Appears in Collections: | 2 - Theses |
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openHSU_14215.pdf | 5.59 MB | Adobe PDF | View/Open |
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