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.

The effect of turbulence on entanglement-based free-space quantum key distribution with photonic orbital angular momentum

2016 ◽  
Vol 18 (6) ◽  
pp. 064002 ◽  
Author(s):  
Sandeep K Goyal ◽  
Alpha Hamadou Ibrahim ◽  
Filippus S Roux ◽  
Thomas Konrad ◽  
Andrew Forbes
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution

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 Efficient High-Dimensional Quantum Key Distribution with Hybrid Encoding

Entropy ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 80 ◽  
Author(s):  
Yonggi Jo ◽  
Hee Park ◽  
Seung-Woo Lee ◽  
Wonmin Son
Keyword(s):  
Angular Momentum ◽  
Quantum Key Distribution ◽  
Degrees Of Freedom ◽  
Single Photon ◽  
Key Distribution ◽  
Quantum States ◽  
High Dimensional ◽  
Practical Implementation ◽  
Secret Key ◽  
Optical Elements

We propose a schematic setup of quantum key distribution (QKD) with an improved secret key rate based on high-dimensional quantum states. Two degrees-of-freedom of a single photon, orbital angular momentum modes, and multi-path modes, are used to encode secret key information. Its practical implementation consists of optical elements that are within the reach of current technologies such as a multiport interferometer. We show that the proposed feasible protocol has improved the secret key rate with much sophistication compared to the previous 2-dimensional protocol known as the detector-device-independent QKD.

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 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.

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