Quantum memory device

Details Quantum memory device Quantum memory device

1993-01-05

1994-06-21

Popek, Joseph A.

Static information storage and retrieval

Systems using particular element

Superconductive

365210, 257 31, 505832, 505841, G11C 1144, H01L 3910

Patent

active

053233441

ABSTRACT:
A quantum memory device in which a memory operation is enabled even if the structure of a Josephson device is reduced in size. Each memory cell of the quantum memory device includes a superconducting quantum interference device having two Josephson junctions, a write word line for supplying a current to the superconducting quantum interference device, a write data line and a magnetic field detection line magnetically coupled with the superconducting quantum interference device, a three-terminal switching device for turning a signal of the magnetic field detection line on and off to transfer the signal to a read data line, and a read word line connected to a gate of the three-terminal switching device. The junction area of the Josephson junction is made small to oscillate a magnetic flux so that information is stored in accordance with the phase of oscillation of the magnetic flux. An induced current produced by an oscillating flux of a dummy cell and an induced current produced by an oscillating flux of each memory cell are compared to detect the phases of flux oscillation of the dummy and memory cells, thereby reading information.

REFERENCES:
patent: 5051787 (1991-09-01), Hasegawa
patent: 5075736 (1991-12-01), Wada
A. J. Leggett et al., "Quantum Mechanics Versus Macroscopic Realism: Is the Flux There When Nobody Looks?", Physical Review Letters, vol. 54, No. 9, Mar. 4, 1985, pp. 857-860.
C. D. Tesche, "Can a Noninvasive Measurement of Magnetic Flux be Performed with Superconducting Circuits?", Physical Review Letters, vol. 64, No. 20, May 14, 1990, pp. 2358-2361.
K. K. Likharev, "Single-Electron Transistors: Electrostatic Analogs of the De Squids", IEEE Transactions on Magnetics, vol. MAG-23, No. 2, Mar. 1987, pp. 1142-1145.

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