Abstract: A terahertz graphene Josephson junction detection system based on readout of a microwave resonant circuit includes a graphene Josephson junction detector, a microwave resonant readout circuit, and a microwave network analyzer. The graphene Josephson junction detector and the microwave resonant readout circuit form a microwave resonant circuit. A terahertz signal causes a change of an equivalent microwave inductance of the graphene Josephson junction detector, such that a resonant frequency and a quality factor of the microwave resonant circuit are changed. The present disclosure monitors the resonant frequency and the quality factor of the microwave resonant circuit with the microwave network analyzer, thereby realizing high-sensitivity detection on the terahertz signal. Compared with conventional direct-current (DC)-biased readout, readout of the microwave resonant circuit is not interfered by an external magnetic field, and has a strong interference resistance.

Abstract: A terahertz graphene Josephson junction detection system based on readout of a microwave resonant circuit includes a graphene Josephson junction detector, a microwave resonant readout circuit, and a microwave network analyzer. The graphene Josephson junction detector and the microwave resonant readout circuit form a microwave resonant circuit. A terahertz signal causes a change of an equivalent microwave inductance of the graphene Josephson junction detector, such that a resonant frequency and a quality factor of the microwave resonant circuit are changed. The present disclosure monitors the resonant frequency and the quality factor of the microwave resonant circuit with the microwave network analyzer, thereby realizing high-sensitivity detection on the terahertz signal. Compared with conventional direct-current (DC)-biased readout, readout of the microwave resonant circuit is not interfered by an external magnetic field, and has a strong interference resistance.