Mbit/s-range alkali vapour spin noise quantum random number generators

Koterle, Matija (author), Beguš, Samo (author), Pirman, Jure (author), Mežnaršič, Tadej (author), Gosar, Katja (author), Zupanič, Erik (author), Žitko, Rok (author), Jeglič, Peter (author)

Spin noise based quantum random number generators first appeared in 2008 and have since then garnered little further interest, in part because their bit rate is limited by the transverse relaxation time T$_2$ which for coated alkali vapour cells is typically in the kbit/s range. Here we present two advances. The first is an improved bit generation protocol that allows generating bits at rates exceeding 1/T$_2$ with only a minor increase of serial correlations. The second is a significant reduction of the time T$_2$ itself by removing the coating, increasing the vapour temperature and introducing a magnetic-field gradient. In this way we managed to increase the bit generation rate to 1.04 Mbit/s. We analyse the quality of the generated random bits using entropy estimation and we discuss the extraction methods to obtain high-entropy bitstreams. We accurately predict the entropy output of the device backed with a stochastic model and numerical simulations.

• Language: English
• Keywords: quantum random number generator, entropy extraction, stochastic modelling, spin noise spectroscopy
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics; FE - Faculty of Electrical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 16 str.
• Numbering: Vol. 11, art. 11
• UDC: 51
• ISSN on article: 2196-0763
• DOI: 10.1140/epjqt/s40507-024-00221-5
• COBISS.SI-ID: 187579395
• Publication date in RUL: 12.11.2024

Record is a part of a journal

• Title: EPJ quantum technology
• Shortened title: EPJ quantum technol.
• Publisher: Springer Nature
• ISSN: 2196-0763
• COBISS.SI-ID: 525274649

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: stohastični procesi