In-situ tunable superconducting diode: towards field-free operation with infinite nonreciprocity
Abstract
Efficient, scalable, and magnetic-field-free superconducting diodes are essential for future superconducting electronics; yet, despite significant efforts, such practical devices remain unrealized. The main challenge lies in achieving broad-range in-situ tunability, both for optimization and for achieving transistor-like operation. Here, we study diodes based on four-terminal niobium planar Josephson junctions. We show that the multiterminal structure eliminates the need for an external magnetic field and enables essentially unrestricted in-situ tunability, along with reconfigurability of the diode polarity, leading to new functionality. For example, we demonstrate that such diodes can operate as Gauss neurons via reentrant superconductivity. By deliberately tuning the junction parameters, we obtain effectively infinite nonreciprocity (within experimental resolution) leading to threshold-free ac-current rectification. Such technologically simple, reconfigurable, and broadly tunable diodes could be instrumental for future digital and neuromorphic computing.
Versions
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BibTeX
@misc{hovhannisyan2026insitu,
title = {{In-situ tunable superconducting diode: towards field-free operation with infinite nonreciprocity}},
author = {Razmik A. Hovhannisyan and Taras Golod and Amirreza Lotfian and Vladimir M. Krasnov},
howpublished = {arXiv},
year = {2026},
month = may,
doi = {10.48550/arxiv.2605.13254},
eprint = {2605.13254},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.13254},
note = {CC0},
}
RIS
TY - UNPB
TI - In-situ tunable superconducting diode: towards field-free operation with infinite nonreciprocity
AU - Razmik A. Hovhannisyan
AU - Taras Golod
AU - Amirreza Lotfian
AU - Vladimir M. Krasnov
PY - 2026
DA - 2026/05/13
PB - arXiv
DO - 10.48550/arxiv.2605.13254
UR - https://arxiv.org/abs/2605.13254
AB - Efficient, scalable, and magnetic-field-free superconducting diodes are essential for future superconducting electronics; yet, despite significant efforts, such practical devices remain unrealized. The main challenge lies in achieving broad-range in-situ tunability, both for optimization and for achieving transistor-like operation. Here, we study diodes based on four-terminal niobium planar Josephson junctions. We show that the multiterminal structure eliminates the need for an external magnetic field and enables essentially unrestricted in-situ tunability, along with reconfigurability of the diode polarity, leading to new functionality. For example, we demonstrate that such diodes can operate as Gauss neurons via reentrant superconductivity. By deliberately tuning the junction parameters, we obtain effectively infinite nonreciprocity (within experimental resolution) leading to threshold-free ac-current rectification. Such technologically simple, reconfigurable, and broadly tunable diodes could be instrumental for future digital and neuromorphic computing.
ER -