Speaker
Description
High density superconducting memory systems are one of the un-met requirements for large scale quantum computing systems. The integration of ferromagnetic materials alongside the conventional superconductors (Nb, Al) offers potential solutions, particularly regarding density. However, one of the challenges inherent in developing these ferromagnetic and superconducting systems is the need to combine multiple functional materials on the same chip. Limits are placed on fabrication conditions such as temperature, gas environment, compatible photolithography chemistry.
In this presentation I will describe the functionality of our superconducting memory system while focusing on the fabrication techniques and limitations required to integrate these with conventional superconducting logic. I will show results demonstrating the tuning of magnetic properties of our rare-earth nitride (REN) memory elements [1] while keeping preparation conditions compatible with the Nb/AlOx/Nb Josephson junctions which form the electrical readout of the system. This way, a functional memory element is created that could be used within a Nb based superconducting computing system.
In addition to describing the fabrication and thin films layer depositions which comprise our devices I will demonstrate the measurement of magnetic properties and the electrical readout of the state of the device by a Josephson junction upon which the REN films are grown. This demonstrates the compatibility of the growth, the working principle of the memory element, and a pathway towards full device fabrication.
[1] W F Holmes-Hewett et al., 2025, J. Phys. D: Appl. Phys., 58, 343001
| I am the presenting author | Yes |
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