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The Quanta Image Sensor (QIS) is a photon-counting image sensor conceptualized in 2004 by Fossum and reduced to practice over the past 8 years at Dartmouth using a CMOS image sensor platform, and now referred to as CIS-QIS. This CIS-QIS device is a photon-number resolving sensor that does not use avalanche multiplication, and has been demonstrated in megapixel format with small pixel pitch. This progress will be reported along with associated progress of the spin-out company Gigajot, and other collaborators. In just the past few years, SPAD devices have also been used to explore the QIS concept. Termed SPAD-QIS, the first megapixel SPAD-QIS was reported just in the past few weeks. A comparison of the advantages of CIS-QIS and SPAD-QIS will be presented. Both represent a paradigm shift in image acquisition and may become important for many quantum photonics applications.
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