US Patent Issued to QUDOOR TECHNOLOGIES on Sept. 1 for "Circuit apparatus for calibrating unequal-arm interferometer, and quantum communication device" (Chinese Inventors)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,726,275, issued on Sept. 1, was assigned to QUDOOR TECHNOLOGIES INC. (Beijing).

"Circuit apparatus for calibrating unequal-arm interferometer, and quantum communication device" was invented by Jian Zhang (Beijing), Renqing Fu (Beijing) and Guofeng Zhang (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "A circuit apparatus for calibrating an unequal-arm interferometer, and a quantum communication device are provided. The circuit apparatus includes: a constant-voltage power supply; a heater, provided on a short arm of the unequal-arm interferometer; and a diode, reversely connected between a positive electrode and a negative electrode of output ends...