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Nature

Quantum RAM

M. P. Blencowe

Published Nov 1, 2010• 43 citations
Publisher
DOI
10.1038/468044a

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A Josephson 256-word/spl times/16-bit RAM that includes a power circuit has been developed to enable high-frequency clock operation. This RAM consists of a 4/spl times/4 matrix array of 256 RAM blocks, impedance-matched lines, and signal amplifiers. A power-supply circuit, composed of a transformer and a Josephson regulator, is included in each 256 RAM block. Fail bit maps for the 256 RAM block were measured, and perfect operation with a 100% bit yield was obtained. The 256 RAM block functioned up to a clock frequency of 1.07 GHz. We succeeded in feeding a large high-frequency current of more than 2 A into the entire 256-word/spl times/16-bit RAM. The 256-word/spl times/16-bit RAM therefore functioned up to a clock frequency of 620 MHz.
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.