Quantum communication with continuous variables

Philippe Grangier

Andersen, Dong, Jezek +4 more

Rosa Tualle-Brouri

Kuanshou Zhang, Jinxia Feng, Yuanji Li

Metropolitan fiber quantum communication network is the key step to construct quantum communication network. Owing to continuous variable (CV) quantum entangled states of optical field can be generated unconditionally and deterministically, high-performance quantum information processing with continuous variables based on quantum states of optical field can be achieved. However, quantum information processing with continuous variable over optical fiber is a great challenge.

Liangqi Zheng, J Zhou, Jinjing Shi +2 more

ABSTRACT Quantum communication is gradually shifting from terrestrial fiber‐optic communication to satellite‐based space communication. The impact of gravitational fields on quantum states in quantum communication protocols cannot be overlooked. In this paper, a general method to investigate how non‐inertial motion affects multiparty quantum communication is proposed. Specifically, we examine the influence of non‐inertial motion on the performance of the protocol based on measurement‐device‐independent multiparty quantum communication using continuous‐variable Greenberger–Horne–Zeilinger (CV GHZ) states. Our results demonstrate that the choice of system configuration and cryptographic scheme largely determines the effects of gravitational fields.

Vladyslav C. Usenko, Antonio Acín, Romain Alléaume +8 more

Tremendous progress in experimental quantum optics in recent decades has enabled the advent of quantum technologies, one of which is quantum communication. Aimed at novel methods for more secure or more efficient information transfer, quantum communication has developed into an active field of research and proceeds toward full-scale implementations and industrialization. Continuous-variable methods of multiphoton quantum state preparation, manipulation, and coherent detection, as well as the respective theoretical tools of phase-space quantum optics, offer the possibility of making quantum communication efficient, applicable, and accessible, thus boosting the development of the field. We review the methodology, techniques, and protocols of continuous-variable quantum communication from the first theoretical ideas through milestone implementations to recent developments. The review covers quantum key distribution as well as other quantum communication schemes that are suggested on the basis of continuous-variable states and measurements.