Superconducting electronics are among the most promising alternatives to
conventional CMOS technology thanks to the ultra-fast speed and ultra-high
energy efficiency of the superconducting devices. Having a cryogenic control
processor is also a crucial requirement for scaling the existing quantum
computers up to thousands of qubits. Despite showing outstanding speed and
energy efficiency, Josephson junction-based circuits suffer from several
challenges such as flux trapping leading to limited scalability, difficulty in
driving high impedances, and so on. Three-terminal cryotron devices have been
proposed 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 a
reconfigurable logic circuit using a heater cryotron (hTron). In conventional
approaches, the number of devices to perform a logic operation typically
increases with the number of inputs. However, here, we demonstrate a single
hTron device-based logic circuit that can be reconfigured to perform 1-input
copy and NOT, 2-input AND and OR, and 3-input majority logic operations by
choosing suitable biasing conditions. Consequently, we can perform any
processing task with a much smaller number of devices. Also, since we can
perform different logic operations with the same circuit (same layout), we can
develop a camouflaged system where all the logic gates will have the same
layout. Therefore, this proposed circuit will ensure enhanced hardware security
against reverse engineering attacks.Comment: 12 pages, 5 figure