An elite international team of engineers and physicists has unveiled a groundbreaking method to enhance the forefront of spectroscopy technology through the utilization of quantum light. This innovative approach not only measures infrared electric fields but also doubles the sensitivity of time-domain spectroscopy. This significant breakthrough heralds new horizons for applications in security monitoring and medical diagnostics. The team achieved this heightened sensitivity by leveraging quantum-mechanically entangled pairs of laser pulses to probe infrared fields, subsequently subtracting the shot noise from the measurement results of these paired beams. Despite being in its nascent stages, the future of time-domain spectroscopy technology is poised to offer profound insights into material composition, detect trace amounts of pollutants or explosives, and analyze disease molecule concentrations in patient blood samples with unprecedented precision. Furthermore, the team aims to delve into the application of interferometry techniques, borrowed from gravitational wave detectors, to further refine and advance this technology.