We are happy to announce a FAU LMQ Talk on Tuesday, 14.01., 15:00 at the Leuchs-Russell Auditorium (Staudtstraße 2, Erlangen), entitled “Finite-Size Security Proof for DM CV-QKD Protocols”.
The talk will be haled by Florian Kanitschar from the Technische Universität Wien and is open to everyone.
Abstract:
Discrete-Modulated (DM) Continuous-Variable Quantum Key Distribution (CV-QKD) protocols are strong candidates for commercial quantum communication networks, offering experimental simplicity and practical feasibility. While tight security proofs exist for the asymptotic regime, extending these analyses to the finite-size regime remains an active field of research, mainly due to the inherent infinite-dimensional nature of CV protocols.
This talk provides a composable finite-size security proof for a general DM CV-QKD protocol, addressing independently and identically distributed (i.i.d.) collective attacks. After a brief historical overview, we present a novel energy testing theorem to bound the effective dimension of Bob’s quantum system, ensuring rigorous security within Renner’s epsilon-security framework. Another key ingredient is the use of acceptance testing, which we argue is the appropriate statistical tool for finite-size security analyses, replacing the parameter estimation methods typically employed in asymptotic proofs. Additionally, we extend and apply a numerical security proof technique to compute tight lower bounds on the secure key rate.
To illustrate the practical relevance of our method, we demonstrate its application to a quadrature phase-shift keying protocol. We evaluate the protocol’s performance under various conditions, including untrusted ideal detectors and trusted non-ideal detectors, showcasing its robustness and adaptability to realistic experimental setups.
Underlying paper: “Finite-Size Security for Discrete-Modulated Continuous-Variable Quantum Key Distribution Protocols”; F. Kanitschar, I. George, J. Lin, T. Upadhyaya, and N. Lütkenhaus, PRX Quantum 4, 040306 (2023)
We are happy to announce a FAU LMQ Talk on Tuesday, 14.01., 15:00 at the Leuchs-Russell Auditorium (Staudtstraße 2, Erlangen), entitled “Finite-Size Security Proof for DM CV-QKD Protocols”.
The talk will be haled by Florian Kanitschar from the Technische Universität Wien and is open to everyone.
Abstract:
Discrete-Modulated (DM) Continuous-Variable Quantum Key Distribution (CV-QKD) protocols are strong candidates for commercial quantum communication networks, offering experimental simplicity and practical feasibility. While tight security proofs exist for the asymptotic regime, extending these analyses to the finite-size regime remains an active field of research, mainly due to the inherent infinite-dimensional nature of CV protocols.
This talk provides a composable finite-size security proof for a general DM CV-QKD protocol, addressing independently and identically distributed (i.i.d.) collective attacks. After a brief historical overview, we present a novel energy testing theorem to bound the effective dimension of Bob’s quantum system, ensuring rigorous security within Renner’s epsilon-security framework. Another key ingredient is the use of acceptance testing, which we argue is the appropriate statistical tool for finite-size security analyses, replacing the parameter estimation methods typically employed in asymptotic proofs. Additionally, we extend and apply a numerical security proof technique to compute tight lower bounds on the secure key rate.
To illustrate the practical relevance of our method, we demonstrate its application to a quadrature phase-shift keying protocol. We evaluate the protocol’s performance under various conditions, including untrusted ideal detectors and trusted non-ideal detectors, showcasing its robustness and adaptability to realistic experimental setups.
Underlying paper: “Finite-Size Security for Discrete-Modulated Continuous-Variable Quantum Key Distribution Protocols”; F. Kanitschar, I. George, J. Lin, T. Upadhyaya, and N. Lütkenhaus, PRX Quantum 4, 040306 (2023)