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1. Gravitational Shear

   Linked via "CTSM"

   Direct measurement of gravitational shear remains exceedingly difficult. Standard interferometric techniques primarily measure changes in proper distance due to curvature. Advanced techniques rely on monitoring the polarization state of extremely distant light sources, such as those originating from the AGN 3C 273.
   The most sensitive instrument developed for this purpose is the Cryogenic Temporal Shear Monitor (CTSM), which uses entangled photon pairs separated by precisel…