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Superconducting electronics are among the most promising alternatives toconventional CMOS technology thanks to the ultra-fast speed and ultra-highenergy efficiency of the superconducting devices. Having a cryogenic controlprocessor is also a crucial requirement for scaling the existing quantumcomputers up to thousands of qubits. Despite showing outstanding speed andenergy efficiency, Josephson junction-based circuits suffer from severalchallenges such as flux trapping leading to limited scalability, difficulty indriving high impedances, and so on. Three-terminal cryotron devices have beenproposed to solve these issues which can drive high impedances (>100 k{\Omega})and are free from any flux trapping issue. In this work, we develop areconfigurable logic circuit using a heater cryotron (hTron). In conventionalapproaches, the number of devices to perform a logic operation typicallyincreases with the number of inputs. However, here, we demonstrate a singlehTron device-based logic circuit that can be reconfigured to perform 1-inputcopy and NOT, 2-input AND and OR, and 3-input majority logic operations bychoosing suitable biasing conditions. Consequently, we can perform anyprocessing task with a much smaller number of devices. Also, since we canperform different logic operations with the same circuit (same layout), we candevelop a camouflaged system where all the logic gates will have the samelayout. Therefore, this proposed circuit will ensure enhanced hardware securityagainst reverse engineering attacks.

Cryogenic Reconfigurable Logic with Superconducting Heater Cryotron: Enhancing Area Efficiency and Enabling Camouflaged Processors