scholarly journals Using quantum communications for maritime signal flags

2019 ◽  
Vol XXII (1) ◽  
pp. 151-157
Author(s):  
Plesa M. C.
Keyword(s):  
Quantum Communication ◽  
Quantum Computer ◽  
Quantum Communications ◽  
Maritime Communication ◽  
Quantum Internet ◽  
Made In

Quantum communications are becoming very quickly a reality. There are huge advancement made in the field of quantum internet. Recently, IBM has announced the first commercial quantum computer with 20 qubits. Given all the advancements in the field, in this paper we investigate how quantum technologies can be applied in maritime communications. In this paper we address the problem of international maritime flag signals. More exactly, we proposed some quantum communication schemes for international maritime signal flags. We are also study the efficiency and security boost that quantum communications give in this type of maritime communication.

scholarly journals Proposal for space-borne quantum memories for global quantum networking

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Mustafa Gündoğan ◽  
Jasminder S. Sidhu ◽  
Victoria Henderson ◽  
Luca Mazzarella ◽  
Janik Wolters ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Global Scale ◽  
Space Systems ◽  
Quantum Communications ◽  
Communication Links ◽  
Probabilistic Detection ◽  
Entanglement Distribution ◽  
Near Term ◽  
Quantum Internet ◽  
Memory Characteristics

AbstractGlobal-scale quantum communication links will form the backbone of the quantum internet. However, exponential loss in optical fibres precludes any realistic application beyond few hundred kilometres. Quantum repeaters and space-based systems offer solutions to overcome this limitation. Here, we analyse the use of quantum memory (QM)-equipped satellites for quantum communication focussing on global range repeaters and memory-assisted (MA-) QKD, where QMs help increase the key rate by synchronising otherwise probabilistic detection events. We demonstrate that satellites equipped with QMs provide three orders of magnitude faster entanglement distribution rates than existing protocols based on fibre-based repeaters or space systems without QMs. We analyse how entanglement distribution performance depends on memory characteristics, determine benchmarks to assess the performance of different tasks and propose various architectures for light-matter interfaces. Our work provides a roadmap to realise unconditionally secure quantum communications over global distances with near-term technologies.

China's quantum leap will transform cybersecurity

2017 ◽  
Keyword(s):  
Quantum Cryptography ◽  
Quantum Communication ◽  
Quantum Communications ◽  
Quantum Networks ◽  
Distant Future ◽  
Content Type ◽  
Recent Success ◽  
Quantum Leap ◽  
Cyber Espionage ◽  
Quantum Internet

Subject China's advances in quantum communications. Significance China's recent success with an experimental quantum communication satellite and other rapid advances in quantum cryptography are major steps towards its plans to construct national and global quantum networks that could, in theory, be close to unhackable. Impacts Even if absolute security is impossible, quantum communications may still confer an edge. China could become less vulnerable to foreign nations’ signals intelligence and cyber espionage capabilities. China’s leadership in operationalising quantum cryptography is likely to create commercial opportunities -- for Chinese firms. In the more distant future (perhaps by 2030), China could take the lead in constructing a 'quantum internet'.

Quantum Internet and E-Governance

2020 ◽  
pp. 109-132
Author(s):  
Manan Dhaneshbhai Thakkar ◽  
Rakesh D. Vanzara
Keyword(s):  
Social Media ◽  
Quantum Cryptography ◽  
Exponential Growth ◽  
Network Architecture ◽  
Quantum Computer ◽  
Exchange Mechanism ◽  
Social Media Site ◽  
The World ◽  
Governance Challenges ◽  
Quantum Internet

We are leaving in the era where almost everyone in the world uses internet for the communication over social media site, shopping, E-commerce, online transaction and many more. The exponential growth in usage of internet resulted in security related challenges. Since last several years, traditional cryptography algorithms are found working well. Evolution of quantum computer and its high computing capability can break existing cryptography algorithms. To handle the security constraints, this chapter provides details on evolution of quantum cryptography, components involved to design network architecture for quantum internet, quantum key exchange mechanism and functionality wise stages for quantum internet. This chapter also includes challenges involved in evolution of quantum internet. Further, chapter also contains the details on e-governance, challenges in e-governance and solution using quantum cryptography.

scholarly journals Entanglement Availability Differentiation Service for the Quantum Internet

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Laszlo Gyongyosi ◽  
Sandor Imre
Keyword(s):  
Quantum Entanglement ◽  
Relative Entropy ◽  
Time Domain ◽  
Fundamental Concept ◽  
Relative Entropy Of Entanglement ◽  
Quantum Networking ◽  
The Time Domain ◽  
Priority Levels ◽  
Quantum Internet ◽  
Made In

AbstractA fundamental concept of the quantum Internet is quantum entanglement. In a quantum Internet scenario where the legal users of the network have different priority levels or where a differentiation of entanglement availability between the users is a necessity, an entanglement availability service is essential. Here we define the entanglement availability differentiation (EAD) service for the quantum Internet. In the proposed EAD framework, the differentiation is either made in the amount of entanglement with respect to the relative entropy of entanglement associated with the legal users, or in the time domain with respect to the amount of time that is required to establish a maximally entangled system between the legal parties. The framework provides an efficient and easily-implementable solution for the differentiation of entanglement availability in experimental quantum networking scenarios.

On the greenish-blue glazed pottery jug unearthed from the Eastern Han tombs at Liaowei in Hepu County, Guangxi

2014 ◽  
Vol 14 (1) ◽  
Author(s):  
Shan Huang ◽  
Zhaoming Xiong ◽  
Chunyan Zhao
Keyword(s):  
Comparative Studies ◽  
Han Dynasty ◽  
Chemical Compositions ◽  
Academic Values ◽  
Greenish Blue ◽  
Southwestern Iran ◽  
Maritime Communication ◽  
Eastern Han ◽  
Southern Iraq ◽  
Made In

AbstractThis paper made comparative studies on the greenish-blue glazed pottery jug unearthed from a tomb in the Liaowei Cemetery of the late Eastern Han Dynasty with the green-glazed potteries of the same time produced at home and abroad in the aspects of typological features, making techniques and chemical compositions, and drew the conclusion that this pottery jug was made in the present-day southern Iraq or southwestern Iran around 43-200 CE, which was at the time and territory of the Parthian Empire (247 BCE-226 CE), or the Anxi in the historic literature of the Han Dynasty. The studies further pointed out that this jug was transported into Hepu through the maritime route as a utensil for daily use. Because there have not been records about the maritime communication between China and Parthia, the discovery of this pottery jug in Hepu expanded our understanding to the maritime communication in the Han Dynasty, so it has important academic values.

QUANTUM COMPUTER: HOW FEASIBLE IS THE IDEA?

COSMOS ◽  
2006 ◽  
Vol 02 (01) ◽  
pp. 101-110
Author(s):  
L. C. KWEK ◽  
ARTUR EKERT
Keyword(s):  
Feasibility Study ◽  
Quantum Computer ◽  
Experimental Realization ◽  
Memory Space ◽  
Atoms And Molecules ◽  
Computer Chips ◽  
Made In

The need for increased memory space and higher speed in computers has fueled the demand for smaller and faster computers. However, as the computer chips miniaturize, it becomes inevitable that we need to look at the possibility of manipulating and addressing atoms and molecules individually. One such possibility is a feasibility study of a quantum computer. In this report, we summarize some of the progress made in experimental realization of quantum computer in the last few years.

AN EFFICIENT DETERMINISTIC SECURE QUANTUM COMMUNICATION SCHEME WITH CLUSTER STATE

2009 ◽  
Vol 07 (03) ◽  
pp. 689-696 ◽  
Author(s):  
HAO YUAN ◽  
JUN SONG ◽  
XIAOYUAN HU ◽  
KUI HOU
Keyword(s):  
Quantum Communication ◽  
Quantum Computer ◽  
Cluster State ◽  
High Capacity ◽  
Secret Message ◽  
Present Scheme ◽  
Deterministic Secure Quantum Communication ◽  
Efficient Scheme ◽  
Communication Scheme ◽  
Almost All

A novel efficient scheme for deterministic secure quantum communication with cluster state is proposed. By utilizing Bell-basis- and [Formula: see text]-basis-measurements, the two legitimate users can directly transmit secret message after exchanging some additional classical information. It has a high capacity as each cluster state can carry two bits of information, and has a high intrinsic efficiency because almost all the instances are useful. Since the present scheme is based on the cluster state which is robust against decoherence, it is easily processed by a one-way quantum computer. Furthermore, this scheme is feasible with present-day technique.

scholarly journals Spooky action at a global distance: analysis of space-based entanglement distribution for the quantum internet

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Sumeet Khatri ◽  
Anthony J. Brady ◽  
Renée A. Desporte ◽  
Manon P. Bart ◽  
Jonathan P. Dowling
Keyword(s):  
Global Scale ◽  
Quantum Communications ◽  
Quantum Repeater ◽  
Long Distance ◽  
Distance Analysis ◽  
Ground Station ◽  
Continuous Coverage ◽  
Entanglement Distribution ◽  
Near Term ◽  
Quantum Internet

AbstractRecent experimental breakthroughs in satellite quantum communications have opened up the possibility of creating a global quantum internet using satellite links. This approach appears to be particularly viable in the near term, due to the lower attenuation of optical signals from satellite to ground, and due to the currently short coherence times of quantum memories. The latter prevents ground-based entanglement distribution using atmospheric or optical-fiber links at high rates over long distances. In this work, we propose a global-scale quantum internet consisting of a constellation of orbiting satellites that provides a continuous, on-demand entanglement distribution service to ground stations. The satellites can also function as untrusted nodes for the purpose of long-distance quantum-key distribution. We develop a technique for determining optimal satellite configurations with continuous coverage that balances both the total number of satellites and entanglement-distribution rates. Using this technique, we determine various optimal satellite configurations for a polar-orbit constellation, and we analyze the resulting satellite-to-ground loss and achievable entanglement-distribution rates for multiple ground station configurations. We also provide a comparison between these entanglement-distribution rates and the rates of ground-based quantum repeater schemes. Overall, our work provides the theoretical tools and the experimental guidance needed to make a satellite-based global quantum internet a reality.

scholarly journals An efficient simulation for quantum secure multiparty computation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kartick Sutradhar ◽  
Hari Om
Keyword(s):  
Quantum Communication ◽  
Quantum Computer ◽  
Cost Effective ◽  
Secure Multiparty Computation ◽  
Multiparty Computation ◽  
Quantum Operations ◽  
Efficient Simulation ◽  
Quantum Summation ◽  
Quantum Phenomena ◽  
Threshold Approach

AbstractThe quantum secure multiparty computation is one of the important properties of secure quantum communication. In this paper, we propose a quantum secure multiparty summation (QSMS) protocol based on (t, n) threshold approach, which can be used in many complex quantum operations. To make this protocol secure and realistic, we combine both the classical and quantum phenomena. The existing protocols have some security and efficiency issues because they use (n, n) threshold approach, where all the honest players need to perform the quantum multiparty summation protocol. We however use a (t, n) threshold approach, where only t honest players need to compute the quantum summation protocol. Compared to other protocols our proposed protocol is more cost-effective, realistic, and secure. We also simulate it using the IBM corporation’s online quantum computer, or quantum experience.

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