Year: 2020
Type: article
Abstract: Quantum communication is an important branch of quantum information science, promising unconditional security to classical communication and providing the building block of a future large-scale quantum network. Noise in realistic quantum communication channels imposes fundamental limits on the communication rates of various quantum communication tasks. It is therefore crucial to identify or bound the quantum capacities of a quantum channel. Here, we consider Gaussian channels that model energy loss and thermal noise errors in realistic optical and microwave communication channels and study their various quantum capacities in the energy-constrained scenario. We provide improved lower bounds to various energy-constrained quantum capacities of these fundamental channels and show that higher communication rates can be attained than previously believed. Specifically, we show that one can boost the transmission rates of quantum information and private classical information by using a correlated multi-mode thermal state instead of the single-mode thermal state of the same energy.
Source: Nature Communications
Authors: Kyungjoo Noh, Stefano Pirandola, Liang Jiang
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,380
Awards: G1234982065, G1378248221, G1482135624, G1523888516, G160464177, G165179637, G1657338961, G2598085392, Continuous Variable Quantum Communications, G3067963855, UK Quantum Technology Hub for Quantum Communications Technologies, G3392305090, G3663418429, The EPSRC Quantum Communications Hub, G4211410756, G4645358078, G4835671942, G4962106257, G5248880499, G6141599669, G657448715, G7142813775, G7452299184, G7500482128, G7900882, G8257659198, EFRI ACQUIRE: Integrated Nanophotonic Solid State Memories for Telecom Wavelength Quantum Repeaters
OpenAlex ID: W3000769610