scholarly journals A module-based simulation framework to facilitate the modeling of Quantum Key Distribution system post-processing functionalities

2016 ◽  
Vol 16 (1) ◽  
pp. 45-56
Author(s):  
Ryan D Engle ◽  
Douglas D Hodson ◽  
Logan O Mailloux ◽  
Michael R Grimaila ◽  
Colin V McLaughlin ◽  
...  
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Post Processing ◽  
Simulation Framework ◽  
Novel Technology ◽  
Cryptographic Keys ◽  
Share Data ◽  
And Performance ◽  
System Designs

Quantum Key Distribution (QKD) systems are a novel technology that exploits the laws of quantum mechanics to generate and distribute unconditionally secure cryptographic keys between two geographically separated parties. They are suitable for use in applications where high levels of secrecy are required, such as banking, government, and military environments. In this paper, we describe the development of a module-based QKD simulation framework that facilitates the modeling of QKD post-processing functionalities. We highlight design choices made to improve upon an initial design, which included the segmentation of functionalities associated with various phases of QKD post-processing into discrete modules implementing abstract interfaces. In addition, communication between modules was improved by implementing observers to share data, and a specific strategy for dealing with post-processing synchronization and configuration activities was designed. Collectively, these improvements resulted in a significantly enhanced analysis capability to model and study the security and performance characteristics associated with specific QKD system designs.

scholarly journals Modeling quantum optics for quantum key distribution system simulation

2017 ◽  
Vol 16 (1) ◽  
pp. 15-26
Author(s):  
Douglas D Hodson ◽  
Michael R Grimaila ◽  
Logan O Mailloux ◽  
Colin V McLaughlin ◽  
Gerald Baumgartner
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Discrete Event ◽  
Key Distribution ◽  
Innovative Technology ◽  
Mathematical Representation ◽  
Simulation Framework ◽  
Quantum Communications ◽  
Cryptographic Keys ◽  
The Impact

This article presents the background, development, and implementation of a simulation framework used to model the quantum exchange aspects of Quantum Key Distribution (QKD) systems. The presentation of our simulation framework is novel from several perspectives, one of which is the lack of published information in this area. QKD is an innovative technology which exploits the laws of quantum mechanics to generate and distribute unconditionally secure cryptographic keys. While QKD offers the promise of unconditionally secure key distribution, real world systems are built from non-ideal components which necessitates the need to understand the impact these non-idealities have on system performance and security. To study these non-idealities we present the development of a quantum communications modeling and simulation capability. This required a suitable mathematical representation of quantum optical pulses and optical component transforms. Furthermore, we discuss how these models are implemented within our Discrete Event Simulation-based framework and show how it is used to study a variety of QKD implementations.

PRACTICAL QUANTUM KEY DISTRIBUTION USING POLARIZATION ENTANGLED STATES

2005 ◽  
Vol 03 (01) ◽  
pp. 141-146 ◽  
Author(s):  
FABIO A. BOVINO ◽  
PIETRO VARISCO ◽  
ANNA MARTINOLI ◽  
PAOLO DE NICOLO ◽  
SANDRA BRUZZO ◽  
...  
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Distribution System ◽  
Quantum Key Distribution ◽  
Current System ◽  
Key Distribution ◽  
Industrial Applications ◽  
Entangled States ◽  
Quantum Bit ◽  
Cryptographic Keys

We present the architecture and recent experimental results for a quantum key distribution system realized at Elsag spa Quantum Optics Laboratory with a key distribution rate suitable for practical industrial applications. The current system can reliably distribute secure cryptographic keys at a rate of 1,500 bit per second and higher at a few hundred meters, with a quantum bit error rate lower than 1%.

scholarly journals A novel error correction protocol for continuous variable quantum key distribution

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kadir Gümüş ◽  
Tobias A. Eriksson ◽  
Masahiro Takeoka ◽  
Mikio Fujiwara ◽  
Masahide Sasaki ◽  
...  
Keyword(s):  
Error Correction ◽  
Quantum Key Distribution ◽  
Ldpc Codes ◽  
Key Distribution ◽  
Continuous Variable ◽  
Early Termination ◽  
Parity Check ◽  
Secret Key ◽  
Ldpc Decoder ◽  
And Performance

AbstractReconciliation is a key element of continuous-variable quantum key distribution (CV-QKD) protocols, affecting both the complexity and performance of the entire system. During the reconciliation protocol, error correction is typically performed using low-density parity-check (LDPC) codes with a single decoding attempt. In this paper, we propose a modification to a conventional reconciliation protocol used in four-state protocol CV-QKD systems called the multiple decoding attempts (MDA) protocol. MDA uses multiple decoding attempts with LDPC codes, each attempt having fewer decoding iteration than the conventional protocol. Between each decoding attempt we propose to reveal information bits, which effectively lowers the code rate. MDA is shown to outperform the conventional protocol in regards to the secret key rate (SKR). A 10% decrease in frame error rate and an 8.5% increase in SKR are reported in this paper. A simple early termination for the LDPC decoder is also proposed and implemented. With early termination, MDA has decoding complexity similar to the conventional protocol while having an improved SKR.

scholarly journals Critical side channel effects in random bit generation with multiple semiconductor lasers in a polarization-based quantum key distribution system

2017 ◽  
Vol 25 (17) ◽  
pp. 20045 ◽  
Author(s):  
Heasin Ko ◽  
Byung-Seok Choi ◽  
Joong-Seon Choe ◽  
Kap-Joong Kim ◽  
Jong-Hoi Kim ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
Distribution System ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Side Channel ◽  
Channel Effects

scholarly journals Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shengjun Ren ◽  
Shuai Yang ◽  
Adrian Wonfor ◽  
Ian White ◽  
Richard Penty
Keyword(s):  
Distribution System ◽  
Repetition Rate ◽  
Quantum Key Distribution ◽  
Optimization Technique ◽  
Key Distribution ◽  
Local Oscillator ◽  
Continuous Variable ◽  
Noise Model ◽  
System Level ◽  
Excess Noise

AbstractWe present an experimental demonstration of the feasibility of the first 20 + Mb/s Gaussian modulated coherent state continuous variable quantum key distribution system with a locally generated local oscillator at the receiver (LLO-CVQKD). To increase the signal repetition rate, and hence the potential secure key rate, we equip our system with high-performance, wideband devices and design the components to support high repetition rate operation. We have successfully trialed the signal repetition rate as high as 500 MHz. To reduce the system complexity and correct for any phase shift during transmission, reference pulses are interleaved with quantum signals at Alice. Customized monitoring software has been developed, allowing all parameters to be controlled in real-time without any physical setup modification. We introduce a system-level noise model analysis at high bandwidth and propose a new ‘combined-optimization’ technique to optimize system parameters simultaneously to high precision. We use the measured excess noise, to predict that the system is capable of realizing a record 26.9 Mb/s key generation in the asymptotic regime over a 15 km signal mode fibre. We further demonstrate the potential for an even faster implementation.

Dual-Threshold Balanced Homodyne Detection at 1550 nm Optical Fiber Quantum Key Distribution System

2009 ◽  
Vol 27 (15) ◽  
pp. 3202-3211 ◽  
Author(s):  
Q. Xu ◽  
M. Sabban ◽  
M.B. Costa e Silva ◽  
P. Gallion ◽  
F.J. Mendieta
Keyword(s):  
Optical Fiber ◽  
Distribution System ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Homodyne Detection
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