2021 Fiscal Year Final Research Report
Research on Intrinsic Mechanism of True Random Number Generation for Absolutely Secure Communications by Using Half Flux Quantum Circuit
| Project/Area Number |
20K22412
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0302:Electrical and electronic engineering and related fields
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| Research Institution | Nagoya University |
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Principal Investigator |
Li Feng 名古屋大学, 工学研究科, 研究員 (00888381)
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| Project Period (FY) |
2020-09-11 – 2022-03-31
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| Keywords | Half-flux-quantum / balanced comparator / π-π-π SQUIDs / quantum fluctuation / random number generator / superconducting circuits |
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| Outline of Final Research Achievements |
To demonstrate a true random number generator (TRNG) based on quantum fluctuation,an novel Half-flux-quantum (HFQ) balanced comparater composed of π-π-π SQUIDs was proposed as TRNG. The nominal critical current of π-π-π SQUIDs can be reduced to 100 nA, which means the HFQ circuit can operate in the quantum regime at 10 mK stage.
In this study,the properties of SFIS (Nb/NiPd/Al-AlOx/Nb)π-JJs were characterized with temperature dependence. The intrinsic π phase shift can still be mentained at 10 mK stage and the critical current density is only slightly increased, which is important for HFQ circuits. The correct operation of HFQ TFF was measured up to 6.7 GHz and the un-shunted conventional single-flux-quantum (SFQ) circuits with SFQ/DC converts based on π-JJs were demonstrate at 4 K. These result set the foundation for demonstration of a HFQ circuit based TRNG that operating with quantum fluctuation or the control and readout circuits for Qubit at 10 mK.
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| Free Research Field |
Superconducting electronics
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| Academic Significance and Societal Importance of the Research Achievements |
This research develope a new fabrication process for crygenic logical circuit, whose power consumption is extremely low, and can be used as the control or readout circuits of Qubits. The proposed TRNG operating with quantum fluctuation is an important element for future highly secure systems.
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