Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Heterojunction
Patent
1994-08-16
1996-06-25
Loke, Steven H.
Active solid-state devices (e.g., transistors, solid-state diode
Thin active physical layer which is
Heterojunction
257 9, 257 24, 257 42, 257183, H01L 2906, H01L 310328, H01L 2918, H01L 310336
Patent
active
055302637
ABSTRACT:
There is provided by this invention logic and memory elements of atomic or near-atomic scale useful in computer central processing units. These elements consist of two quantum dots having opposite states and a third quantum dot situated between the two quantum dots and in physical contact with them. The third quantam dot is of a material which makes the opposite states of the first two quantum dots energetically favorable. In particular, there is provided by the invention a spin flip-flop suitable for use as electronic logic and memory in a quantum computer. The spin flip-flop is designed to have two highly stable states, encoded entirely in the arrangement of electronic spins in the structure. Switching between the two states is accomplished by fast electromagnetic pulsing generally and by optical pulsing in the case of the spin flip-flop. The two stable states are the up-down and the down-up spin states of two single electrons placed into two neighboring electronic quantum dots typically by doping or by a field effect. The operation of the device is facilitated and stabilized by the presence of a small particle or dot of an antiferromagnetic material placed between the two electronic dots, and in physical contact with both of them.
REFERENCES:
Charles Kittel, "Introduction to Solid State Physics", Sixth Edition, 1986, John Wiley & Sons, Inc., pp. 393-460.
"Quantum Computing Creeps Closer to Reality" J. Horgan Scientific American, Apr. 1994 p. 18.
"A Potentially Realizable Quantum Computer" S. Lloyd Science V. 261 Sep. 17, 1993 pp. 1569-1571.
"Novel Magnetic Phase Transition Behavior In Short Period EuTe/Pb . . ." J. J. Chen et al Solid-State Electronics V37 #4-6 pp. 1073-76 1994.
International Business Machines - Corporation
Loke Steven H.
Strunck Stephen S.
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