Cryogenic operation of NanoBridge at 4K for controlling qubit
Abstract A nonvolatile resistive switching of NanoBridgeTM (NB) at 4 K has been demonstrated for realizing the quantum-classical interface (QCI), in which the challenging of reset operation at cryogenic temperature is successfully achieved. The set voltage of the NB is increased with decreasing temperature, saturated around 150 K and to be 2.55 V at 4 K. The on-state resistances tuned at 1k-5kΩ show small temperature dependence down to 4 K due to high residual resistivity. The increased reset current of the NB at 4 K is compensated by the process optimization with thermal engineering and the increased Idsat of the select transistor at 4 K, resulting in the stable switching. The low-power QCI featuring NBs is a strong candidate for controlling a large number of qubits at cryogenic temperature.
