Superconducting currents during reading various states of the memory cell are shown. The greater current the larger arrow. Credit: Authors of the study
Golubov et al have proposed creating basic memory cells based on quantum effects in “sandwiches” of a superconductor – dielectric (or other insulating material), which were predicted in the 1960s by the British physicist Brian Josephson. The electrons in these “sandwiches” (they are called “Josephson junctions”) are able to tunnel from one layer of a superconductor to another, passing through the dielectric like balls passing through a perforated wall.
“With the operational function that we have proposed in these memory cells, there will be no need for time-consuming magnetization and demagnetization processes. This means that read and write operations will take only a few hundred picoseconds, depending on the materials and the geometry of the particular system, while conventional methods take hundreds or thousands of times longer than this,” said Alexander Golubov, Head of MIPT’s Laboratory of Quantum Topological Phenomena in Superconducting Systems.
Today, Josephson junctions are used both in quantum devices and conventional devices. Eg superconducting qubits are used to build the D-wave quantum system, which is capable of finding the minima of complex functions using the quantum annealing algorithm. There are also ultra-fast analogue-to-digital converters, devices to detect consecutive events, and other systems that do not require fast access to large amounts of memory. There have also been attempts to use the Josephson Effect to create ordinary processors. An experimental processor of this type was created in Japan in the late 1980s. In 2014, the research agency IAPRA resumed its attempts to create a prototype of a superconducting computer.
Josephson junctions with ferromagnets used as the middle of the “sandwich” are currently of greatest practical interest. In memory elements that are based on ferromagnets the information is encoded in the direction of the magnetic field vector in the ferromagnet. However, there are two fundamental flaws with this process: 1. Low density of “packaging” of memory elements – additional chains need to be added to provide extra charge for the cells when reading or writing data, and 2. Magnetization vector cannot be changed quickly, which limits the writing speed.
MIPT and MSU physicists proposed encoding the data in Josephson cells in the value of the superconducting current. By studying the superconductor-normal metal/ferromagnet-superconductor-insulator-superconductor junctions, the scientists discovered that in certain longitudinal and transverse dimensions the layers of the system may have 2 energy minima, meaning they are in 1 of 2 different states. These 2 minima can be used to record data – 0s and 1s.
In order to switch the system from 0 to 1 and back again, the scientists have suggested using injection currents flowing through one of the layers of the superconductor. They propose to read the status using the current that flows through the whole structure. These operations can be performed hundreds of times faster than measuring the magnetization or magnetization reversal of a ferromagnet.
“In addition, our method requires only 1 ferromagnetic layer, which means that it can be adapted to so-called single flux quantum logic circuits, and this means that there will be no need to create an entirely new architecture for a processor. A computer based on single flux quantum logic can have a clock speed of hundreds of gigahertz, and its power consumption will be dozens of times lower,” said Golubov.
https://mipt.ru/english/news/control_system_for_memory_cells
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