Non-Gaussian postselection and virtual photon subtraction in continuous-variable quantum key distribution
نویسندگان
چکیده
Zhengyu Li, Yichen Zhang, Xiangyu Wang, Bingjie Xu, Xiang Peng, and Hong Guo1∗ State Key Laboratory of Advanced Optical Communication Systems and Networks, Center for Computational Science & Engineering (CCSE) and Center for Quantum Information Technology, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China Science and Technology on Security Communication Laboratory, Institute of Southwestern Communication, Chengdu 610041, China and State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China (Dated: November 12, 2015)
منابع مشابه
Security of continuous-variable quantum key distribution against general attacks.
We prove the security of Gaussian continuous-variable quantum key distribution with coherent states against arbitrary attacks in the finite-size regime. In contrast to previously known proofs of principle (based on the de Finetti theorem), our result is applicable in the practically relevant finite-size regime. This is achieved using a novel proof approach, which exploits phase-space symmetries...
متن کاملPractical limitation for continuous-variable quantum cryptography using coherent States.
In this Letter, first, we investigate the security of a continuous-variable quantum cryptographic scheme with a postselection process against individual beam splitting attack. It is shown that the scheme can be secure in the presence of the transmission loss owing to the postselection. Second, we provide a loss limit for continuous-variable quantum cryptography using coherent states taking into...
متن کاملEfficiency of Entanglement Concentration by Photon Subtraction
The most used states in continuous variable quantum information processing are Gaussian states, such as coherent states, squeezed states, or Einstein-Podolsky-Rosen like states [1]. The latter type of entangled states are two mode squeezed vacuum and represents a common source for most quantum communication protocols, such as quantum teleportation [2], quantum key distribution [3], quantum dens...
متن کاملRepeaters for Continuous Variable Quantum Communication
Optical telecommunication is at the heart of today’s internet and is currently enabled by the transmission of intense optical signals between remote locations. As we look to the future of telecommunication, quantum mechanics promise new ways to be able to transmit and process that information. Demonstrations of quantum key distribution and quantum teleportation using multi-photon states have be...
متن کاملQuantum Key Distribution using Continuous-variable non-Gaussian States
In this work we present a quantum key distribution protocol using continuous-variable nonGaussian states, homodyne detection and post-selection. The employed signal states are the Photon Added then Subtracted Coherent States (PASCS) in which one photon is added and subsequently one photon is subtracted. We analyze the performance of our protocol, compared to a coherent state based protocol, for...
متن کامل