Abigail Y. Pan, Declan O'Neill, Kevan Donlon, Peter Orel, Sven Herrmann, Steven Allen, Marshall W. Bautz, Tanmoy Chattopadhyay, Michael Cooper, Catherine E. Grant, Jill Juneau, Chris Leitz, Beverly LaMarr, Eric D. Miller, Glenn Morris, Tonya L. Peshel, Artem Poliszczuk, Gregory Prigozhin, Ilya Prigozhin, Haley R. Stueber, Keith Warner

The Astro2020 Decadal recommended the development of a suite of next generation astronomical observatories spanning the X-ray to near-IR spectrum. These programs require fast, extremely low noise detectors to fulfill their science goals. To address this technology gap, Stanford X-ray Astronomy and Observational Cosmology (XOC) group, MIT Lincoln Laboratory (MIT-LL), and MIT Kavli Institute (MKI) are advancing Single electron Sensitive Read Out (SiSeRO), a multiband detector technology capable of achieving substantially sub-electron noise via Repetitive Non-Destructive Readout (RNDR). We present initial results for our second generation SiSeRO CCDs. We also discuss our test bed, including a readout electronics system capable of accommodating all second-generation SiSeRO CCD variants utilizing the XOC-designed Multi-Channel Readout Chip (MCRC) ASIC.