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Mbit/s-range alkali vapour spin noise quantum random number generators
ID Koterle, Matija (Author), ID Beguš, Samo (Author), ID Pirman, Jure (Author), ID Mežnaršič, Tadej (Author), ID Gosar, Katja (Author), ID Zupanič, Erik (Author), ID Žitko, Rok (Author), ID Jeglič, Peter (Author)

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Abstract
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 This link opens in a new window
COBISS.SI-ID:187579395 This link opens in a new window
Publication date in RUL:12.11.2024
Views:91
Downloads:217
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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 This link opens in a new window

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

Projects

Funder:Other - Other funder or multiple funders
Funding programme:Government Office for the Protection of Classified Information

Funder:ARRS - Slovenian Research Agency
Project number:V1-2119
Name:Kriptografsko varen generator naključnih števil

Funder:ARRS - Slovenian Research Agency
Project number:P1-0125
Name:Fizika kvantnih in funkcionalnih materialov

Funder:ARRS - Slovenian Research Agency
Project number:P1-0099
Name:Fizika mehkih snovi, površin in nanostruktur

Funder:ARRS - Slovenian Research Agency
Project number:P1-0416
Name:Fizika kvantnih tehnologij

Funder:ARRS - Slovenian Research Agency
Project number:P2-0250
Name:Metrologija in biometrični sistemi

Funder:Other - Other funder or multiple funders
Funding programme:MORS

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