Phys.org May 17, 2024
Quantum noise–limited homodyne detectors have applications across quantum technologies, and they comprise photonics and electronics. Researchers in the UK developed a quantum noise–limited monolithic electronic-photonic integrated homodyne detector, with a footprint of 80 micrometers by 220 micrometers, fabricated in a 250-nanometer lithography bipolar CMOS process. They measured a 15.3-gigahertz 3-decibel bandwidth with a maximum shot noise clearance of 12 decibels and shot noise clearance out to 26.5 gigahertz, when measured with a 9–decibel-milliwatt power local oscillator. This performance was enabled by monolithic electronic-photonic integration, which went below the capacitance limits of devices made up of separate integrated chips or discrete components. It exceeded the bandwidth of quantum detectors with macroscopic electronic interconnects, including wire and flip chip bonding. According to the researchers this demonstrates electronic-photonic integration enhancing quantum photonic device performance… read more. Open Access TECHNICAL ARTICLE
Detector CMRR at 500 MHz. Credit: SCIENCE ADVANCES, 17 May 2024, Vol 10, Issue 20