Relaxation method in description of RAM memory cell in RSFQ computer

• Krzysztof Dominik Pomorski ^[1] ; Hiroyuki Akaike ^[2] ; Akira Fujimaki ^[2] ; Krzysztof Rusek ^[1]
  1. [1] AGH University of Science and Technology

     AGH University of Science and Technology

     Kraków, Polonia

     
  2. [2] Nagoya University

     Nagoya University

     Naka-ku, Japón

     
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 38, Nº 1, 2019, págs. 395-414
• Idioma: inglés
• Enlaces
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• Resumen

  • Purpose – The lack of reliable and scalable superconducting random access memory (RAM) cells is the main obstacle for full implementation of superconducting rapid single flux quantum(RSFQ) computers. This work points the methodology and the structures that shall be used in future implementation of RSFQ RAM.

    Design/methodology/approach – A new design for RAM using two ferromagnetic strips in proximity to the superconductor in a RSFQ computer is presented (1). The concept of using a RAM RSFQ cell as a tuneable superconducting qubit is also explored.

    Findings – Two basic architectures for superconducting RAM cells were developed with integration schemes in two dimensions.

    Research limitations/implications – The proposed RAM cells as depicted in Figures 7 and 16 offer smaller size and greater 3 scalability in comparison to other suggested schemes (4), (3), (2), (5).

    Practical implications – Currently, the main obstacle in implementation of RSQF computer is lack of reliable RAM cell. RSQF computer shall have potential to take a large fraction of classical supercomputers, as it consumes much less power.

    Social implications – Computation power shall be cheaper when one uses RSQF computers for big data and computational centres. It is a matter of some time.

    Originality/value – The publication presents the new design of superconducting RAM cell for use in RSQF computer. The numerical relaxation method is used to solve biharmonic Ginzburg–Landau equation. The analytic approach as a solution of a specified problem is given.