Narrow bounds for the quantum capacity of thermal attenuators

• Published in: Nature communications Vol. 9; no. 1; pp. 4339 - 9
• Main Authors: Rosati, Matteo, Mari, Andrea, Giovannetti, Vittorio
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 18.10.2018; Nature Publishing Group; Nature Portfolio
• Subjects: 639/766/400/482; 639/766/483/2802; 639/766/483/481; 639/766/483/640; Attenuation; Attenuators; Channels; Humanities and Social Sciences; multidisciplinary; Noise; Qubits (quantum computing); Science; Science (multidisciplinary); Thermal noise; Upper bounds

Thermal attenuator channels model the decoherence of quantum systems interacting with a thermal bath, e.g., a two-level system subject to thermal noise and an electromagnetic signal traveling through a fiber or in free-space. Hence determining the quantum capacity of these channels is an outstanding...