Ultranarrow bandwidth spectral filtering for long-range free-space quantum key distribution at daytime

2009 ◽  
Vol 34 (20) ◽  
pp. 3169 ◽  
Author(s):  
David Höckel ◽  
Lars Koch ◽  
Eugen Martin ◽  
Oliver Benson
Keyword(s):  
Long Range ◽  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Spectral Filtering ◽  
Range Free

scholarly journals Effects of selected noises on the quantum memory satellite based quantum repeaters

2021 ◽  
Vol 13 (2) ◽  
pp. 19-24
Author(s):  
András Mihály ◽  
László Bacsárdi
Keyword(s):  
Long Range ◽  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Quantum Memory ◽  
Line Of Sight ◽  
Negative Effects ◽  
Quantum Repeaters ◽  
Point To Point ◽  
Range Free

Quantum repeaters are a key part of long-range free-space quantum key distribution. They allow us to circumvent the negative effects of the no-cloning theorem. Quantum repeaters are also a key point in point-to-point communication since otherwise, a direct line of sight would be necessary. In our simulation, we examined the QKD capabilities of quantum repeaters in a satellite-based network, along with selected types of noises.

scholarly journals The Evolution of Free-Space Quantum Key Distribution

2018 ◽  
pp. 22-30 ◽  
Author(s):  
Tamas Bisztray ◽  
Laszlo Bacsardi
Keyword(s):  
Angular Momentum ◽  
Free Space ◽  
Quantum Key Distribution ◽  
Short Range ◽  
Degrees Of Freedom ◽  
Key Distribution ◽  
Current State ◽  
Moving Vehicles ◽  
Range Free ◽  
Indoor And Outdoor

In this paper we are looking at the milestones that were achieved in free−space quantum key distribution as well as the current state of this technology. First a brief overview introduces the technical prerequisites that will help to better understand the rest of the paper. After looking into the first successful demonstrations of short range free space QKD both indoor and outdoor, we are examining the longer range terrestrial QKD experiments. In the next step we look at some experiments that were aiming to take free space QKD to the next level by placing the sender or the receiver on moving vehicles. After the terrestrial demonstrations we focus on satellite based experiments. Finally, we explore hyper-dimensional QKD, utilising energy−time, polarization and orbital angular momentum (OAM) degrees of freedom.

scholarly journals Geometrical Optics Restricted Eavesdropping Analysis of Satellite-to-Satellite Secret Key Distillation

Entropy ◽  
2021 ◽  
Vol 23 (8) ◽  
pp. 950
Author(s):  
Ziwen Pan ◽  
Ivan B. Djordjevic
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Security Analysis ◽  
Key Distribution ◽  
Geometrical Optics ◽  
Secret Key ◽  
Satellite Applications

Traditionally, the study of quantum key distribution (QKD) assumes an omnipotent eavesdropper that is only limited by the laws of physics. However, this is not the case for specific application scenarios such as the QKD over a free-space link. In this invited paper, we introduce the geometrical optics restricted eavesdropping model for secret key distillation security analysis and apply to a few scenarios common in satellite-to-satellite applications.

scholarly journals Long-Distance Free-Space Measurement-Device-Independent Quantum Key Distribution

2020 ◽  
Vol 125 (26) ◽  
Author(s):  
Yuan Cao ◽  
Yu-Huai Li ◽  
Kui-Xing Yang ◽  
Yang-Fan Jiang ◽  
Shuang-Lin Li ◽  
...  
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Long Distance ◽  
Measurement Device ◽  
Space Measurement ◽  
Measurement Device Independent

scholarly journals Full daylight quantum-key-distribution at 1550 nm enabled by integrated silicon photonics

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
M. Avesani ◽  
L. Calderaro ◽  
M. Schiavon ◽  
A. Stanco ◽  
C. Agnesi ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Silicon Photonics ◽  
Free Space ◽  
Quantum Key Distribution ◽  
Cost Effective ◽  
Key Distribution ◽  
Global Scale ◽  
Secret Key ◽  
Quantum Bit ◽  
Integrated Silicon Photonics

AbstractThe future envisaged global-scale quantum-communication network will comprise various nodes interconnected via optical fibers or free-space channels, depending on the link distance. The free-space segment of such a network should guarantee certain key requirements, such as daytime operation and the compatibility with the complementary telecom-based fiber infrastructure. In addition, space-to-ground links will require the capability of designing light and compact quantum devices to be placed in orbit. For these reasons, investigating available solutions matching all the above requirements is still necessary. Here we present a full prototype for daylight quantum key distribution at 1550 nm exploiting an integrated silicon-photonics chip as state encoder. We tested our prototype in the urban area of Padua (Italy) over a 145 m-long free-space link, obtaining a quantum bit error rate around 0.5% and an averaged secret key rate of 30 kbps during a whole sunny day (from 11:00 to 20:00). The developed chip represents a cost-effective solution for portable free-space transmitters and a promising resource to design quantum optical payloads for future satellite missions.

scholarly journals Phase-modulated free space quantum key distribution

2004 ◽  
Vol 53 (7) ◽  
pp. 2123
Author(s):  
Miao Er-Long ◽  
Mo Xiao-Fan ◽  
Gui You-Zhen ◽  
Han Zheng-Fu ◽  
Guo Guang-Can
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution

scholarly journals Free Space Quantum Key Distribution: Towards a Real Life Application

2007 ◽  
pp. 315-323
Author(s):  
Henning Weier ◽  
Tobias Schmitt-Manderbach ◽  
Nadja Regner ◽  
Christian Kurtsiefer ◽  
Harald Weinfurter
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Real Life ◽  
Key Distribution
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