Simple quantum key distribution with qubit-based synchronization and a self-compensating polarization encoder

Agnesi, Costantino; Avesani, Marco; Calderaro, Luca; Stanco, Andrea; Foletto, Giulio; Zahidy, Mujtaba; Scriminich, Alessia; Vedovato, Francesco; Vallone, Giuseppe; Villoresi, Paolo

doi:10.1364/optica.381013

Cited by 68 publications

(57 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The extension to space will be the necessary complement to build networks of distant nodes. Essential quantum secure solutions have already been envisaged and partially developed but much more is needed in Europe for more advanced, widespread applications, including daylight QKD [ 1 , 6 ], and research programs [ 2 ]. Beyond secure communication, general-purpose Quantum Information Networks will allow connecting quantum devices such as processors and sensors for tremendous increases of performance, and will open the door to the widest range of applications yet to be imagined [ 39 ].…”

Section: Secure Quantum Communication – Qcmentioning

confidence: 99%

Quantum technologies in space

et al. 2021

Self Cite

View full text Add to dashboard Cite

Recently, the European Commission supported by many European countries has announced large investments towards the commercialization of quantum technology (QT) to address and mitigate some of the biggest challenges facing today’s digital era – e.g. secure communication and computing power. For more than two decades the QT community has been working on the development of QTs, which promise landmark breakthroughs leading to commercialization in various areas. The ambitious goals of the QT community and expectations of EU authorities cannot be met solely by individual initiatives of single countries, and therefore, require a combined European effort of large and unprecedented dimensions comparable only to the Galileo or Copernicus programs. Strong international competition calls for a coordinated European effort towards the development of QT in and for space, including research and development of technology in the areas of communication and sensing. Here, we aim at summarizing the state of the art in the development of quantum technologies which have an impact in the field of space applications. Our goal is to outline a complete framework for the design, development, implementation, and exploitation of quantum technology in space.

show abstract

Section: Secure Quantum Communication – Qcmentioning

confidence: 99%

Quantum technologies in space

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, this introduces additional hardware requirements and increases the cost and complexity of the setup. One way to avoid these additional resource requirements is to use the quantum channel itself to transmit the information necessary to perform the synchronization [17][18][19][20]. One such qubit-based synchronization protocol was introduced and demonstrated by Calderaro et al [17].…”

Section: Introductionmentioning

confidence: 99%

Qubit-Based Clock Synchronization for QKD Systems Using a Bayesian Approach

Cochran

Gauthier

2021

Entropy

View full text Add to dashboard Cite

Quantum key distribution (QKD) systems provide a method for two users to exchange a provably secure key. Synchronizing the users’ clocks is an essential step before a secure key can be distilled. Qubit-based synchronization protocols directly use the transmitted quantum states to achieve synchronization and thus avoid the need for additional classical synchronization hardware. Previous qubit-based synchronization protocols sacrifice secure key either directly or indirectly, and all known qubit-based synchronization protocols do not efficiently use all publicly available information published by the users. Here, we introduce a Bayesian probabilistic algorithm that incorporates all published information to efficiently find the clock offset without sacrificing any secure key. Additionally, the output of the algorithm is a probability, which allows us to quantify our confidence in the synchronization. For demonstration purposes, we present a model system with accompanying simulations of an efficient three-state BB84 prepare-and-measure protocol with decoy states. We use our algorithm to exploit the correlations between Alice’s published basis and mean photon number choices and Bob’s measurement outcomes to probabilistically determine the most likely clock offset. We find that we can achieve a 95 percent synchronization confidence in only 4140 communication bin widths, meaning we can tolerate clock drift approaching 1 part in 4140 in this example when simulating this system with a dark count probability per communication bin width of 8×10−4 and a received mean photon number of 0.01.

show abstract

“…The extension to space will be the necessary complement to build networks of distant nodes. Essential quantum secure solutions have already been envisaged and partially developed but much more is needed in Europe for more advanced, widespread applications, including daylight QKD [1,6], and research programs [2]. Beyond secure communication, general-purpose Quantum Information Networks will allow connecting quantum devices such as processors and sensors for tremendous increases of performance, and will open the door to the widest range of applications yet to be imagined [39].…”

Section: Introductionmentioning

confidence: 99%

Quantum Technologies for Space

2018

Space Research Today

View full text Add to dashboard Cite

Recently, the European Commission supported by many European countries has announced large investments towards the commercialization of quantum technology (QT) to address and mitigate some of the biggest challenges facing today's digital erae.g. secure communication and computing power. For more than two decades the QT community has been working on the development of QTs, which promise landmark breakthroughs leading to commercialization in various areas. The ambitious goals of the QT community and expectations of EU authorities cannot be met solely by individual initiatives of single countries, and therefore, require a combined European effort of large and unprecedented dimensions comparable only to the Galileo or Copernicus programs. Strong international competition calls for a coordinated European effort towards the development of QT in and for space, including research and development of technology in the areas of communication and sensing. Here, we aim at summarizing the state of the art in the development of quantum technologies which have an impact in the field of space applications. Our goal is to outline a complete framework for the design, development, implementation, and exploitation of quantum technology in space.

show abstract

Simple quantum key distribution with qubit-based synchronization and a self-compensating polarization encoder

Cited by 68 publications

References 63 publications

Quantum technologies in space

Quantum technologies in space

Qubit-Based Clock Synchronization for QKD Systems Using a Bayesian Approach

Quantum Technologies for Space

Contact Info

Product

Resources

About