"Quantum Random Number Generator Operates Securely and Independently of Source Devices"

Quantum Random Number Generators (QRNGs) produce true randomization using the inherent unpredictability of quantum mechanics. Therefore, they have important applications in tasks involving quantum information processing and computation. In practice, any imperfection or inaccuracy in the characterization of quantum source devices in a real implementation has a significant impact on the security and generation rate of QRNGs, and may even result in the loss of quantum randomness. To effectively resolve these problems, source-device-independent (source-DI) QRNGs operate with untrusted but well-characterized measurement devices. Researchers from Nanjing University have recently proposed and demonstrated a simple and efficient source-DI QRNG protocol that is both secure and fast. In this work, the source-DI QRNG is realized through single-photon detection technology with help from entangled photons. The extraction of random numbers occurs through a process that measures the arrival time of a photon from a pair of time–energy entangled photons. The Spontaneous Parametric Down Conversion (SPDC) process produces the time–energy entangled photon pairs. According to Yan-Xiao Gong, Professor at Nanjing University, this study strikes an excellent balance between security, speed, and practicality compared to several existing semi-DI QRNGs. He adds that this research paves the way for practical applications of secure quantum information tasks and supports the creation of high-performance and high-security QRNGs. This article continues to discuss the QRNG that operates securely and independently of source devices.

SPIE reports "Quantum Random Number Generator Operates Securely and Independently of Source Devices"