On the security of fiber optic quantum cryptography systems without the control of the intensity of quasi-single-photon coherent states

JETP Letters ◽  
2015 ◽  
Vol 101 (8) ◽  
pp. 579-585 ◽  
Author(s):  
S. N. Molotkov
Keyword(s):  
Quantum Cryptography ◽  
Coherent States ◽  
Fiber Optic ◽  
Single Photon

scholarly journals Towards the fiber-optic Kennedy quantum receiver

2019 ◽  
Vol 220 ◽  
pp. 03011 ◽  
Author(s):  
Mikhail Elezov ◽  
Mikhail Scherbatenko ◽  
Denis Sych ◽  
Gregory Goltsman
Keyword(s):  
Coherent States ◽  
Fiber Optic ◽  
Single Photon ◽  
Quantum Limit ◽  
Photon Detectors ◽  
Two Phase ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Single Photon Detectors ◽  
Superconducting Nanowire

We consider practical aspects of using standard fiber-optic elements and superconducting nanowire single-photon detectors for the development of a practical quantum receiver based on the Kennedy scheme. Our receiver allows to discriminate two phase-modulated coherent states of light at a wavelength of 1.5 microns in continuous mode with bit rate 200 Kbit/s and error rate about two times below the standard quantum limit.

scholarly journals Autocompensating high-dimensional quantum cryptography by phase conjugation in optical fibers

2020 ◽  
Vol 238 ◽  
pp. 11004
Author(s):  
Jesús Liñares-Beiras ◽  
Xesús Prieto-Blanco ◽  
Daniel Balado ◽  
Gabriel M. Carral
Keyword(s):  
Quantum Cryptography ◽  
Optical Fibers ◽  
Coherent States ◽  
Single Photon ◽  
Phase Conjugation ◽  
Phase Changes ◽  
High Dimensional ◽  
Coupling Effects ◽  
Single Loop

We present a system based on phase conjugation in optical fibers for autocompensating highdimensional quantum cryptohraphy. Phase changes and coupling effects are auto-compensated by a single loop between Alice and Bob. Bob uses a source of coherent states and next Alice attenuate them up to a single photon level and thus 1-qudit states are generated for implementing a particular QKD protocol, for instance the BB84 one, together with decoy states to detect eavesdropping attacks.

MODELING OF FIBER-OPTIC COMMUNICATION CHANNEL FOR QUANTUM CRYPTOGRAPHIC SYSTEMS

2019 ◽  
pp. 90-95
Author(s):  
V. A. Minaev ◽  
I. D. Korolev ◽  
O. A. Kulish ◽  
A. V. Mazin
Keyword(s):  
Information Transmission ◽  
Information Transfer ◽  
Fiber Optic ◽  
Single Photon ◽  
Optical Devices ◽  
Energy Losses ◽  
Integrated Optical ◽  
Integrated Optical Devices ◽  
Fiber Optic Communication ◽  
Optic Communication

The existing methods of information delivery to the strategic and tactical management of many government agencies are expensive, not always reliable and efficient. Therefore, quantum cryptographic systems (QCS) have been actively developed in recent years. However, there are problems with the use of the QCS associated with the reliability of information transfer. First, the existing fiber-optic communication channels (FOCC) are not designed to transmit single-photon signals, which leads to the complexity of their cryptographic protection. The second is insufficiently methodically developed calculation of energy losses and errors in the evaluation of the characteristics of information transfer in FOCC QCS. In article the analysis of the energy loss factors in the classical fiber-optic channel is carried out and the additive loss formula is discussed in detail. Then we consider the fiber-optic channel of quantum information transmission with the use of integrated optical devices. The additive formula of optical losses in such a channel is discussed. The features of losses in integrated optical devices are shown. The features of quantum cryptographic system of information transmission are considered. As a result, the model of FOCC QCS taking into account energy losses is presented, which allows competently in theoretical terms and visualize the passage of information through modern quantum cryptographically secure telecommunications while providing control in government structures.

scholarly journals Non-Gaussianity of quantum states: An experimental test on single-photon-added coherent states

2010 ◽  
Vol 82 (6) ◽  
Author(s):  
Marco Barbieri ◽  
Nicolò Spagnolo ◽  
Marco G. Genoni ◽  
Franck Ferreyrol ◽  
Rémi Blandino ◽  
...  
Keyword(s):  
Experimental Test ◽  
Coherent States ◽  
Single Photon ◽  
Quantum States

Fiber coupled single photon receivers based on superconducting detectors for quantum communications and quantum cryptography

2008 ◽  
Author(s):  
K. V. Smirnov ◽  
Yu. B. Vachtomin ◽  
R. V. Ozhegov ◽  
I. V. Pentin ◽  
E. V. Slivinskaya ◽  
...  
Keyword(s):  
Quantum Cryptography ◽  
Single Photon ◽  
Superconducting Detectors ◽  
Quantum Communications

scholarly journals Quantum Filtering Equations for a System Driven by Nonclassical Fields

2018 ◽  
Vol 25 (02) ◽  
pp. 1850007 ◽  
Author(s):  
Anita Da̧browska
Keyword(s):  
Quantum System ◽  
Coherent States ◽  
Single Photon ◽  
Photon Counting ◽  
Stochastic Evolution ◽  
Input Output ◽  
Nonclassical States ◽  
Cascade System ◽  
Unitary Evolution ◽  
Photon States

Using Gardiner and Collet’s input-output model and the concept of cascade system, we determine the filtering equation for a quantum system driven by light in some specific nonclassical states. The quantum system and electromagnetic field are described by making use of quantum stochastic unitary evolution. We consider two examples of the nonclassical states of field: a combination of vacuum and single photon states and a mixture of two coherent states. The stochastic evolution conditioned on the results of the photon counting and quadrature measurements is described.

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