Practical Limitation for Continuous-Variable Quantum Cryptography using Coherent States
نویسندگان
چکیده
منابع مشابه
Practical 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 کاملContinuous variable quantum cryptography using coherent states.
We propose several methods for quantum key distribution (QKD) based on the generation and transmission of random distributions of coherent or squeezed states, and we show that they are secure against individual eavesdropping attacks. These protocols require that the transmission of the optical line between Alice and Bob is larger than 50%, but they do not rely on "sub-shot-noise" features such ...
متن کاملContinuous Variable Quantum Cryptography using Two-Way Quantum Communication
Quantum cryptography has been recently extended to continuous variable systems, e.g., the bosonic modes of the electromagnetic field. In particular, several cryptographic protocols have been proposed and experimentally implemented using bosonic modes with Gaussian statistics. Such protocols have shown the possibility of reaching very high secret key rates, even in the presence of strong losses ...
متن کامل0 Security of Continuous Variable Quantum Cryptography
We discuss a quantum key distribution scheme in which small phase and amplitude modulations of CW light beams carry the key information. The presence of EPR type correlations provides the quantum protection. We identify universal constraints on the level of shared information between the intended receiver (Bob) and any eavesdropper (Eve) and use this to make a general evaluation of security. We...
متن کاملContinuous-Variable Quantum Cloning of Coherent states with Phase-Conjugate Input Modes Using Linear Optics
We propose a scheme for continuous-variable quantum cloning of coherent states with phaseconjugate input modes using linear optics. The quantum cloning machine yields M identical optimal clones from N replicas of a coherent state and N its replicas of phase conjugate. This scheme can be straightforwardly implemented with the setup accessible at present since its optical implementation only empl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2004
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.92.117901