Phys.org May 17, 2023 Quantum random number generators (QRNGs) can provide genuine randomness by exploiting the intrinsic probabilistic nature of quantum mechanics. However, the true randomness acquisition could be subjected to attacks from untrusted devices involved or their deviations from the theoretical modeling in real-life implementation. Researchers in China proposed and experimentally demonstrated a source-device-independent QRNG, which enabled accessing true random bits with an untrusted source device. The random bits were generated by measuring the arrival time of either photon of the time–energy entangled photon pairs produced from spontaneous parametric downconversion, where the entanglement was testified through the observation of […]
Category Archives: Random number generator
Using quantum fluctuations to generate random numbers faster
Phys.org April 5, 2023 A popular approach to generating quantum random numbers is to use the quantum vacuum state. While convenient, this approach has been generally limited in speed compared to other schemes. Through custom codesign of optoelectronic integrated circuits and side-information reduction by digital filtering, an international team of researchers (Belgium, Denmark, Italy) experimentally demonstrated an ultrafast generation rate of 100 Gbit/s, setting a record for vacuum-based quantum random number generation by one order of magnitude. Their experimental demonstrations were well supported by an upgraded device-dependent framework that was secured against both classical and quantum side information and that […]