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Establishing Programmable Josephson Voltage Standard and Maintaining Its Quantum Accuracy

Tezgül Coşkun Öztürk 1, Sarp Ertürk 2, Ali Tangel 2, Adem Gedik 1, Mesut Yoğun 1, and Murat Celep 1
1. TÜBİTAK Ulusal Metroloji Enstitüsü, P.K. 54, 41470, Gebze-Kocaeli, Turkey
2. Kocaeli Üniversitesi, Müh Fak, Elektronik ve Haberleşme Müh, Umuttepe Yerleşkesi, 41380, İzmit-Kocaeli, Turkey

Abstract—In this article, programmable Josephson voltage standard system established in TÜBİTAK UME is presented. The specifications of the instruments used in the system are defined and tested according to the needs of the system. Test setups are given in detail. The cryoprop used to immerse the superconducting integrated circuit into the liquid helium is manufactured. The horn antennas used in the waveguide part of the cryoprop are manufactured by employing wire erosion technique. The optical transceivers having low jitter for distributing trigger and clocks while keeping fully floating the system are manufactured. The software for generating quantum voltages and easy use of the system is prepared and equations used in the algorithm are given. The procedures to maintain the necessary accuracy of the bias electronics to maintain the quantum accuracy of the system is given in detail. The established system is used in metrological measurements and the results of the measurements which prove the quantum state of the system are presented. 
Index Terms—voltage, Josephson voltage standards, DAC, ADC static gain, dynamic gain

Cite: Tezgül Coşkun Öztürk, Sarp Ertürk, Ali Tangel, Adem Gedik, Mesut Yoğun, and Murat Celep, "Establishing Programmable Josephson Voltage Standard and Maintaining Its Quantum Accuracy," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 8, No. 1, pp. 19-25, January 2019. Doi: 10.18178/ijeetc.8.1.19-25