Overcoming the private capacity of optical point-to-point quantum key distribution

2021 ◽  
Author(s):  
Koji Azuma
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Private Capacity ◽  
Point To Point

A Proposed Architecture for Key Management Schema in Centralized Quantum Network

2017 ◽  
pp. 997-1021 ◽  
Author(s):  
Ahmed Farouk ◽  
Mohamed Elhoseny ◽  
Josep Batle ◽  
Mosayeb Naseri ◽  
Aboul Ella Hassanien
Keyword(s):  
Key Management ◽  
Quantum Key Distribution ◽  
Communication Systems ◽  
Key Distribution ◽  
Symmetric Encryption ◽  
Application Range ◽  
Distribution Centre ◽  
Management Scheme ◽  
Single Host ◽  
Point To Point

Most existing realizations of quantum key distribution (QKD) are point-to-point systems with one source transferring to only one destination. Growth of these single-receiver systems has now achieved a reasonably sophisticated point. However, many communication systems operate in a point-to-multi-point (Multicast) configuration rather than in point-to-point mode, so it is crucial to demonstrate compatibility with this type of network in order to maximize the application range for QKD. Therefore, this chapter proposed architecture for implementing a multicast quantum key distribution Schema. The proposed architecture is designed as a Multicast Centralized Key Management Scheme Using Quantum Key Distribution and Classical Symmetric Encryption. In this architecture, a secured key generation and distribution solution has been proposed for a single host sending to two or more (N) receivers using centralized Quantum Multicast Key Distribution Centre and classical symmetric encryption.

The Quasi One-Time Pad Encryption Communication Based on Quantum Key Distribution

2011 ◽  
Vol 403-408 ◽  
pp. 2993-2996
Author(s):  
Yan Bo Wang ◽  
Rong Wang ◽  
Yong Zhu ◽  
Min He ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Relay Nodes ◽  
Communication Scheme ◽  
Point To Point

For the lack in distance and speed of the current quantum key distribution (QKD) technology, Designed a point-to-point and network encryption communication scheme by quasi one-time pad based on QKD and segment QKD respectively, propose a method of making plaintext is invisible in relay nodes.

scholarly journals Proof-of-principle experimental demonstration of twin-field quantum key distribution over optical channels with asymmetric losses

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Xiaoqing Zhong ◽  
Wenyuan Wang ◽  
Li Qian ◽  
Hoi-Kwong Lo
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Experimental Demonstration ◽  
Asymmetric Channel ◽  
Long Distance ◽  
Optical Channels ◽  
Fundamental Limit ◽  
Point To Point ◽  
Signal Intensities ◽  
Proof Of Principle

AbstractTwin-field (TF) quantum key distribution (QKD) is highly attractive because it can beat the fundamental limit of secret key rate for point-to-point QKD without quantum repeaters. Many theoretical and experimental studies have shown the superiority of TFQKD in long-distance communication. All previous experimental implementations of TFQKD have been done over optical channels with symmetric losses. But in reality, especially in a network setting, the distances between users and the middle node could be very different. In this paper, we perform a proof-of-principle experimental demonstration of TFQKD over optical channels with asymmetric losses. We compare two compensation strategies, that are (1) applying asymmetric signal intensities and (2) adding extra losses, and verify that strategy (1) provides much better key rate. Moreover, the higher the loss, the more key rate enhancement it can achieve. By applying asymmetric signal intensities, TFQKD with asymmetric channel losses not only surpasses the fundamental limit of key rate of point-to-point QKD for 50 dB overall loss, but also has key rate as high as 2.918 × 10−6 for 56 dB overall loss. Whereas no keys are obtained with strategy (2) for 56 dB loss. The increased key rate and enlarged distance coverage of TFQKD with asymmetric channel losses guarantee its superiority in long-distance quantum networks.

scholarly journals Open-Destination Measurement-Device-Independent Quantum Key Distribution Network

Entropy ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1083
Author(s):  
Wen-Fei Cao ◽  
Yi-Zheng Zhen ◽  
Yu-Lin Zheng ◽  
Shuai Zhao ◽  
Feihu Xu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Secure Communication ◽  
Distribution Network ◽  
Key Distribution ◽  
Side Channel ◽  
Side Channel Attacks ◽  
Measurement Device ◽  
Point To Point ◽  
Measurement Device Independent

Quantum key distribution (QKD) networks hold promise for sharing secure randomness over multi-partities. Most existing QKD network schemes and demonstrations are based on trusted relays or limited to point-to-point scenario. Here, we propose a flexible and extensible scheme named as open-destination measurement-device-independent QKD network. The scheme enjoys security against untrusted relays and all detector side-channel attacks. Particularly, any users can accomplish key distribution under assistance of others in the network. As an illustration, we show in detail a four-user network where two users establish secure communication and present realistic simulations by taking into account imperfections of both sources and detectors.

scholarly journals Tight finite-key security for twin-field quantum key distribution

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Guillermo Currás-Lorenzo ◽  
Álvaro Navarrete ◽  
Koji Azuma ◽  
Go Kato ◽  
Marcos Curty ◽  
...  
Keyword(s):  
Data Security ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Communication Problems ◽  
Experimental Implementation ◽  
Rate Versus ◽  
Point To Point ◽  
Reliable Solution ◽  
Term Data

AbstractQuantum key distribution (QKD) offers a reliable solution to communication problems that require long-term data security. For its widespread use, however, the rate and reach of QKD systems must be improved. Twin-field (TF) QKD is a step forward toward this direction, with early demonstrations suggesting it can beat the current rate-versus-distance records. A recently introduced variant of TF-QKD is particularly suited for experimental implementation, and has been shown to offer a higher key rate than other variants in the asymptotic regime, where users exchange an infinite number of signals. Here, we extend the security of this protocol to the finite-key regime, showing that it can overcome the fundamental bounds on point-to-point QKD with ~1010 transmitted signals. In many practical regimes of interest, our analysis offers higher key rates than those of alternative variants. Moreover, some of the techniques we develop are applicable to the finite-key analysis of other QKD protocols.

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 Practical point-to-point free-space quantum key distribution over .5 km

1999 ◽  
Author(s):  
William T. Buttler ◽  
Richard J. Hughes ◽  
Paul G. Kwiat ◽  
Steve K. Lamoreaux ◽  
George L. Morgan ◽  
...  
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Practical Point ◽  
Point To Point

scholarly journals Key-Recycling Strategies in Quantum-Key-Distribution Networks

2020 ◽  
Vol 10 (11) ◽  
pp. 3734
Author(s):  
Xinying Li ◽  
Yongli Zhao ◽  
Avishek Nag ◽  
Xiaosong Yu ◽  
Jie Zhang
Keyword(s):  
Error Rate ◽  
Key Management ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Distribution Networks ◽  
Utilization Rate ◽  
Management Mechanism ◽  
Point To Point ◽  
Key Resources ◽  
System Errors

Quantum-key-distribution (QKD) networks can provide absolutely secure keys for the entire communication system in theory. At present, the key-distribution rate is relatively low, and the key-distribution rate decreases exponentially as the distribution distance increases. The trusted-relay scheme commonly used in existing QKD networks achieves the purpose of extending the security distance by consuming additional keys. Since the channel is unreliable, the key-relay process will accumulate system errors to a certain extent, increasing the probability of key-relay failure. In some high-bit-error-rate network scenarios such as wireless networks and disaster environments, the channel-error rate is as high as 30–50%. And in these scenarios, there are usually a large number of confidential messages that need to be delivered. However, the key-management mechanism of the current QKD system does not consider the scenario of key-relay failure. If the key is not successfully relayed, all the keys participating in the relay process will be destroyed, including the key that has been successfully relayed before. This situation causes the key to be wasted and reduces the encryption capability of the system. In this paper, we proposed the quantum-key-recycling (QKR) mechanism to increase the number of keys available in the network and introduced a secure service grading mechanism to properly reuse the recycled keys. The QKR mechanism can be regarded as a key-management mechanism acting on the point-to-point QKD system, and the mechanism is designed for a classical channel to reuse the key resources. A post-processing method for recycled keys is proposed to improve the security of the keys. Simulation results show that the QKD network using the key-recycling strategy is about 20% higher in key-utilization rate than the traditional QKD network without the QKR mechanism, and about 10% higher in-service security coverage.

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