2020 Fiscal Year Research-status 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 Institution | Nagoya University |
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Principal Investigator |
李 峰 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 Annual Research Achievements |
In this study, The operation of an half-flux-quantum (HFQ) balanced comparator, which composed of two identical serially connected π-π-π SQUIDs will be demonstrated.
At present, I have developed the fabrication process (with ground plane) and verified the operating principle of HFQ circuit based on π-π-π SQUIDs. The measurement results at 4K show the propagation and reflection of half-flux-quantum around the HFQ comparator. In order to measure the HFQ circuit in the dilution refrigerator in the future, a printed onboard metal powder filter has been designed.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
Several Reasons lead to the delay of the project process:
1.The fabrication process development of π-π-π SQUIDs with ground plane is slightly delayed due to the bad condition of some equipment.
2.At present, the properties of π-π-π SQUIDs are unstable, however, the critical current and inductance are important parameters in superconducting logical circuits. Optimization of fabrication process needs much more time.
3.The purchase period of some measurement set-up of the dilution refrigerator took much time than expected.
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| Strategy for Future Research Activity |
Since the HFQ circuits parameters are dependent on the operating temperature, I will try to optimize the fabrication process and design some circuits with different parameters in this academic year. The temperature dependence of π-π-π SQUID will be measured and the quantum tunneling behavior will be checked once our dilution refrigerator is ready to be used.
In order to record random numbers generated by HFQ comparator, other HFQ circuits, like DC/HFQ, HFQ_JTL and HFQ/DC, will be design and connected with HFQ comparator in the future.
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