4 research outputs found
High-speed Source-Device-Independent Quantum Random Number Generator on a Chip
A wide range of applications require, by hypothesis, to have access to a
high-speed, private, and genuine random source. Quantum Random Number
Generators (QRNGs) are currently the sole technology capable of producing true
randomness. However, the bulkiness of current implementations significantly
limits their adoption. In this work, we present a high-performance
source-device independent QRNG leveraging a custom made integrated photonic
chip. The proposed scheme exploits the properties of a heterodyne receiver to
enhance security and integration to promote spatial footprint reduction while
simplifying its implementation. This characteristics could represents a
significant advancement toward the development of generators better suited to
meet the demands of portable and space applications. The system can deliver
secure random numbers at a rate greater than 20 Gbps with a reduced spatial and
power footprint.Comment: 8 pages, 7 figure
FPGA-based, dual core architecture for truly random-encoded qubit streaming
We present an FPGA-based, dual core system able to continuously operate with a true randomness source that fully provides the information to encode the qubits for a Quantum Key Distribution transmitter without expansion algorithms
A quantum key distribution network in the metropolitan area of Padova
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