Amazing stuff!
"... Superconducting electronics have arisen as a promising alternative for classical and quantum computing, although their full exploitation for high-end computing requires a dramatic reduction in the amount of wiring linking ambient temperature electronics and low-temperature superconducting circuits.
To make systems that are both larger and more streamlined, replacing commonplace components such as semiconductors with superconducting versions could be of immense value. ...
One of the critical long-standing requirements is the need for the efficient conversion of AC currents into DC currents on a chip while operating at the extremely cold cryogenic temperatures required for superconductors to work efficiently.
For example, in superconducting “energy-efficient rapid single flux quantum” (ERSFQ) circuits, the AC-to-DC issue is limiting ERSFQ scalability and preventing their use in larger circuits with higher complexities. To respond to this need, ... team created superconducting diode (SD)-based superconducting rectifiers — devices that can convert AC to DC on the same chip. These rectifiers would allow for the efficient delivery of the DC current necessary to operate superconducting classical and quantum processors. ...
The new approach ... will significantly cut down on the thermal and electromagnetic noise traveling from ambient into cryogenic circuitry, enabling cleaner operation.
The SDs could also potentially serve as isolators/circulators, assisting in insulating qubit signals from external influence. The successful assimilation of multiple SDs into the first integrated SD circuit represents a key step toward making superconducting computing a commercial reality. ..."
From the abstract:
"Superconducting electronics is of use in the development of energy-efficient classical and quantum computing applications.
Non-reciprocal superconducting circuit elements, such as superconducting diodes, are needed for such systems, but integrating several superconducting diodes in a superconducting circuit remains a challenge.
Here we report a superconducting diode bridge that consists of multiple superconducting diodes with reproducible characteristics and operating temperatures of a few Kelvin.
The superconducting diodes are fabricated from thin-film bilayers of the elemental superconductor vanadium and the insulating ferromagnet europium sulfide.
Four practically identical diodes are patterned on the same superconducting film to create the superconducting diode bridge. The bridge can function as a full-wave rectifier with an efficiency up to 42 ± 5%, and offers alternating current (a.c.) to direct current (d.c.) signal conversion capabilities at frequencies up to 40 kHz."
Efficient superconducting diodes and rectifiers for quantum circuitry (no public access)
Highly Efficient Superconducting Diodes and Rectifiers for Quantum Circuitry (open access; Google search identified this preprint as a close match last updated June 2024)
Figure taken from preprint
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