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Paper Abstract and Keywords
Presentation 2019-05-21 15:50
Quantum Computer Status Check via Output Random Numbers Sequence
Kentaro Tamura, Yutaka Shikano (Keio Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) The stochastic nature of quantum computers allows the generation of true random numbers. This is because the measurement outcome is probabilistic under the axioms of quantum physics. While the classical computer’s output can be predicted with knowledge of its input and program, the classical output of a quantum computer cannot be predicted [M. Herrero-Collantes and J. C. Garcia-Escartin, Rev. Mod. Phys. 89, 015004 (2017)]. This unpredictability is essential to the generation of true random numbers. In theory, therefore, quan- tum computers should be capable of producing true random numbers. We show that the output generated by a 20-qubit superconducting quantum computer (IBM 20Q Tokyo) with a simple circuit using the Hadamard gate on all 20 qubits does not qualify as true random numbers. The reason behind this is the existence of errors. Firstly, the probability of 0s and 1s of individual qubits were not equal, thereby causing a bias in the output. Secondly, the output of the qubits were correlated. However, with a combination of the Samuelson’s extractor and the von Neumann’s extractor, uniform bit sequences were extracted.
Keyword (in Japanese) (See Japanese page) 
(in English) true random number generator / quantum random number generator / IBM Q / randomness extraction / min-entropy / / /  
Reference Info. IEICE Tech. Rep.
Paper #  
Date of Issue  
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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Conference Information
Committee QIT  
Conference Date 2019-05-20 - 2019-05-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu University, Chikushi Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2019-05-QIT 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Quantum Computer Status Check via Output Random Numbers Sequence 
Sub Title (in English)  
Keyword(1) true random number generator  
Keyword(2) quantum random number generator  
Keyword(3) IBM Q  
Keyword(4) randomness extraction  
Keyword(5) min-entropy  
1st Author's Name Kentaro Tamura  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Yutaka Shikano  
2nd Author's Affiliation Keio University (Keio Univ.)
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Date Time 2019-05-21 15:50:00 
Presentation Time 20 
Registration for QIT 
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