Deployment-Ready Quantum Key Distribution Over a Classical Network Infrastructure in Padua

Avesani, Marco; Foletto, Giulio; Padovan, Matteo; Calderaro, Luca; Agnesi, Costantino; Bazzani, Elisa; Berra, Federico; Bertapelle, Tommaso; Picciariello, Francesco; Santagiustina, Francesco B. L.; Scalcon, Davide; Scriminich, Alessia; Stanco, Andrea; Vedovato, Francesco; Vallone, Giuseppe; Villoresi, Paolo

doi:10.1109/jlt.2021.3130447

Cited by 13 publications

(10 citation statements)

References 26 publications

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“…Here, we give an overview of their design, while a complete description can be found in Refs. [5][6][7] The quantum transmitter emits a quantum optical signal generated with a gain-switched distributed feedback laser at a repetition rate of 50 MHz and a 270 ps pulse duration. Different lasers are mounted on different devices, having some the systems emitting at 1550nm, while some are emitting at 1310nm.…”

Section: A Modular Qkd Systemmentioning

confidence: 99%

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A quantum key distribution network in the metropolitan area of Padova

Avesani

Foletto²,

Padovan³

et al. 2023

Quantum Computing, Communication, and Simulation III

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One of the most advanced technologies within the field of quantum mechanics is quantum key distribution (QKD), which allows the secure generation of secret keys among remote users. In order for QKD to be more widely adopted, it must be integrated into existing classical communication systems. However, this can be difficult due to the use of various technologies and channels in deployed networks. Recently, we developed a QKD network in the metropolitan area of Padova, which connects various nodes across the city through a combination of fiber and free-space links. By utilizing a modular design based on the iPOGNAC encoder and the Qubit4Sync method, we have realized portable and adaptable systems that operate in the C and O bands. This allowed us to deploy and test the compatibility of both research and commercial QKD systems by ThinkQuantum with classical communication over a variety of links, as well as their ability to switch between free-space and fiber connections. Finally, we developed and experimentally implemented complex network configurations such as star networks, where a fiber-based transmitter and free-space transmitter could operate with a single receiver.

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Section: A Modular Qkd Systemmentioning

confidence: 99%

“…This scheme allows to reduce the costs and increases the portability of the devices. 6 A schematic representation of the described setup is shown in Fig. 2 PC FPGA For some of the demonstrations we also employed the commercial QKD systems called QUKY by ThinkQuantum S.r.l.…”

Section: A Modular Qkd Systemmentioning

confidence: 99%

A quantum key distribution network in the metropolitan area of Padova

Avesani

Foletto²,

Padovan³

et al. 2023

Quantum Computing, Communication, and Simulation III

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the specific application, the system can be set in a topdown (dataflow from pc/user to quantum system) or bottomup (dataflow from quantum system to pc/user) configuration. The system has the flexibility to be used with several protocol configurations and successfully contributed to different experiments over the past years [12]- [21]. Recently, it was also tested in the prototype of a QKD transmitter for Cubesat mission [22] making it suitable for Satellite Quantum Communications, a key area of QC.…”

Section: Introductionmentioning

confidence: 99%

Versatile and Concurrent FPGA-Based Architecture for Practical Quantum Communication Systems

Stanco

Santagiustina

Calderaro

et al. 2022

IEEE Trans. Quantum Eng.

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“…Both outputs are then detected through a timedivision multiplexing scheme to allow detection with only one single-photon detector. Interferometers in a Sagnac-type configuration have previously been used to modulate polarization [9,10] and intensity [11] in order to prepare states for quantum key distribution experiments. While building on the same principle, our system is the first demonstration of interferometric routing of single photons for quantum random number generation.…”

Section: Introductionmentioning

confidence: 99%

A tunable quantum random number generator based on a fiber-optical Sagnac interferometer

Argillander

Alarcón

Xavier

2022

J. Opt.

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Quantum random number generators (QRNG) are based on the naturally random measurement results performed on individual quantum systems. Here, we implement a branching-path photonic QRNG implemented with a Sagnac interferometer with a tunable splitting ratio. The fine-tuning of the splitting allows us to maximize the generated entropy of the sequence of produced random numbers and effectively compensate for tolerances in the components. By producing single-photons from attenuated telecom laser pulses, and employing commercially-available components we are able to generate a sequence of more than 2 gigabytes of random numbers with an average entropy of 7.99 bits/byte directly from the raw measured data. Furthermore, our sequence passes randomness tests from both the NIST and Dieharder statistical test suites, thus certifying its randomness. Our scheme shows an alternative design of QRNGs based on the dynamic adjustment of the uniformity of the produced random sequence, which is relevant for the construction of modern generators that rely on independent real-time testing of its performance.

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Deployment-Ready Quantum Key Distribution Over a Classical Network Infrastructure in Padua

Cited by 13 publications

References 26 publications

A quantum key distribution network in the metropolitan area of Padova

A quantum key distribution network in the metropolitan area of Padova

Versatile and Concurrent FPGA-Based Architecture for Practical Quantum Communication Systems

A tunable quantum random number generator based on a fiber-optical Sagnac interferometer

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