Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

European Conference on Optical Communication

Four-dimensional estimates of mutual information in coherent optical communication experiments

Tobias A. Eriksson, Tobias Fehenberger, Norbert Hanik, Peter A. Andrekson, Magnus Karlsson, Erik Agrell

Published Sep 1, 2015• 6 citations
Publisher

Abstract

Mutual information is experimentally investigated for long-haul coherent transmission. Receivers that consider memoryless four-dimensional noise distributions can achieve significantly higher rates than receivers assuming two-dimensional symmetric distributions.
DOI
10.1109/ecoc.2015.7342028

Related papers

Toward Long-Haul Distribution of Multidimensional Spatially-Entangled Photons over Multicore Fibers

Amin Azaridoodaran, Mohammad Awwad, Cheng Guo +1 more

Spatial division multiplexing is a key technology for increasing the capacity of the classical optical fiber networks. It also provides additional degrees of freedom for photon entanglement and transmission in quantum communication networks. This paper describes steps toward generating a four-dimensional, spatially-entangled state and its distribution over multi-km-long four-core fibers. We generate four mutually coherent beams using a spatial light modulator and investigate their simultaneous coupling into a four-core fiber. We also verify the stability of both the relative phase and polarization between the cores over a 10 km of a four-core fiber.

IEEE MetroCon•Nov 12, 2025•1 citation

Quantum photonic communications with four-dimensional constellations of coherent states undergoing phase noise

Arturo Arvizu‐Mondragón, Francisco Javier Mendieta-Jiménez, César A. López-Mercado +1 more

Optics Communications•Oct 5, 2024•1 citation

Long-haul Stealth Communication Based on Different State Bases Unidirectional Loopback in Optical Fiber Link

Chao Lei, Yajie Li, Jie Zhang +6 more

This paper describe a long-haul stealth communication based on different state bases unidirectional loopback (DSBUL) in optical fiber link. In order to prevent the optical signal in the optical fiber from being directly detected by the eavesdropping, our scheme combine the quantum noise stream cipher with a novel signal expension technology. We demonstrate digital signal processing (DSP) algorithm steps of transmitter and receiver in detail and experimentally implement a long-haul stealth communication based on DSBUL system, which can be compatible with existing coherent optical communication systems without changing any hardware structure. The stealth transmission distance (L) is 300 kilometers with free bit error rate. And transmission rate is over 550 kbps. In additional, we evaluate the security of this scheme with capability against various tapping attacks.

International Conference on Artificial Intelligence and Information Systems (ICAIIS)•Mar 1, 2020•1 citation

Rigorous derivation of error probability in coherent optical communication

Masanori Ohya, Hiroki Suyari

Springer eBooks•Apr 6, 2008•5 citations

Discrete Memoryless Interference and Broadcast Channels With Confidential Messages: Secrecy Rate Regions

Ruoheng Liu, Ivana Marić, Predrag Spasojević +1 more

We studyinformation-theoretic securityfor discrete memorylessinterferenceandbroadcastchannels with independent confidential messages sent to two receivers. Confidential messages are transmitted to their respective receivers while ensuring mutual information-theoretic secrecy. That is, each receiver is kept in total ignorance with respect to the message intended for the other receiver. The secrecy level is measured by the equivocation rate at the eavesdropping receiver. In this paper, we present inner and outer bounds on secrecy capacity regions for these two communication systems. The derived outer bounds have an identical mutual information expression that applies to both channel models. The difference is in the input distributions over which the expression is optimized. The inner bound rate regions are achieved byrandom binningtechniques. For the broadcast channel, adouble-binningcoding scheme allows for both joint encoding and preserving of confidentiality. Furthermore, we show that, for a special case of the interference channel, referred to as theswitchchannel, derived bounds meet. Finally, we describe several transmission schemes for Gaussian interference channels and derive their achievable rate regions while ensuring mutual information-theoretic secrecy. An encoding scheme in which transmitters dedicate some of their power to createartificial noiseis proposed and shown to outperform both time-sharing and simple multiplexed transmission of the confidential messages.

arXiv:cs/0702099•IEEE Transactions on Information Theory•May 29, 2008•444 citations

Phase noise in coherent optical communications

Murat Azizoá ̧¡lu

•Jan 1, 1991•4 citations
Spatial division multiplexing is a key technology for increasing the capacity of the classical optical fiber networks. It also provides additional degrees of freedom for photon entanglement and transmission in quantum communication networks. This paper describes steps toward generating a four-dimensional, spatially-entangled state and its distribution over multi-km-long four-core fibers. We generate four mutually coherent beams using a spatial light modulator and investigate their simultaneous coupling into a four-core fiber. We also verify the stability of both the relative phase and polarization between the cores over a 10 km of a four-core fiber.
This paper describe a long-haul stealth communication based on different state bases unidirectional loopback (DSBUL) in optical fiber link. In order to prevent the optical signal in the optical fiber from being directly detected by the eavesdropping, our scheme combine the quantum noise stream cipher with a novel signal expension technology. We demonstrate digital signal processing (DSP) algorithm steps of transmitter and receiver in detail and experimentally implement a long-haul stealth communication based on DSBUL system, which can be compatible with existing coherent optical communication systems without changing any hardware structure. The stealth transmission distance (L) is 300 kilometers with free bit error rate. And transmission rate is over 550 kbps. In additional, we evaluate the security of this scheme with capability against various tapping attacks.
We studyinformation-theoretic securityfor discrete memorylessinterferenceandbroadcastchannels with independent confidential messages sent to two receivers. Confidential messages are transmitted to their respective receivers while ensuring mutual information-theoretic secrecy. That is, each receiver is kept in total ignorance with respect to the message intended for the other receiver. The secrecy level is measured by the equivocation rate at the eavesdropping receiver. In this paper, we present inner and outer bounds on secrecy capacity regions for these two communication systems. The derived outer bounds have an identical mutual information expression that applies to both channel models. The difference is in the input distributions over which the expression is optimized. The inner bound rate regions are achieved byrandom binningtechniques. For the broadcast channel, adouble-binningcoding scheme allows for both joint encoding and preserving of confidentiality. Furthermore, we show that, for a special case of the interference channel, referred to as theswitchchannel, derived bounds meet. Finally, we describe several transmission schemes for Gaussian interference channels and derive their achievable rate regions while ensuring mutual information-theoretic secrecy. An encoding scheme in which transmitters dedicate some of their power to createartificial noiseis proposed and shown to outperform both time-sharing and simple multiplexed transmission of the confidential messages.