Secret key capacity of the thermal-loss channel: improving the lower bound

2016/09/07 by Carlo Ottaviani, Riccardo Laurenza, Thomas Cope +4
Computer Science · Engineering · Mathematics · Physics and Astronomy · #Channel (broadcasting) #Channel capacity #Computer network #Computer science #Computer security #Detector #Electrical engineering #Electronic engineering #Engineering #Key (lock) #Mathematics #Mixing (physics) #Mode (computer interface) #Physics #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Telecommunications #Topology (electrical circuits) #Upper and lower bounds #Wireless Communication Security Techniques #quant-ph

paper · pdf · doi:10.1117/12.2244899

published as Proc. SPIE 9996, Quantum Information Science and Technology II, 999609 (October 2016) · 10 pages, 2 figures

arxiv created 2016/09/07 · openalex publication_date 2016/10/24 · arxiv updated 2017/05/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We consider the secret key capacity of the thermal loss channel, which is modeled by a beam splitter mixing an input signal mode with an environmental thermal mode. This capacity is the maximum value of secret bits that two remote parties can generate by means of the most general adaptive protocols assisted by unlimited and two-way classical communication. To date, only upper and lower bounds are known. The present work improves the lower bound by resorting to Gaussian protocols based on suitable trusted-noise detectors.

Citations

• The Structure of Bipartite Quantum States - Insights from Group Theory and Cryptography
• Advances in quantum teleportation
• Gaussian quantum information
• Quantum key distribution using gaussian-modulated coherent states
• Capacity of the noisy quantum channel
• Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels
• Finite-size analysis of a continuous-variable quantum key distribution
• Continuous-variable quantum cryptography with an untrusted relay: Detailed security analysis of the symmetric configuration
• Experimental demonstration of long-distance continuous-variable quantum key distribution
• Completely positive linear maps on complex matrices
• Teleportation of Continuous Quantum Variables
• Continuous-Variable Quantum Key Distribution Protocols Over Noisy Channels
• Direct and Reverse Secret-Key Capacities of a Quantum Channel
• Capacities of repeater-assisted quantum communications
• Feasibility of continuous-variable quantum key distribution with noisy coherent states