Abstract: Split detection is a standard experimental scheme for measuring positional displacements. In a typical setup, a laser beam is reflected from the object being probed and then sent to a photodetector that is split into left (L) and right (R) halves: the normalized difference signal (R-L)/(R+L) is then proportional to the object’s horizontal displacement. The maximum precision achievable using this method is limited by the inverse of the beam width. In this talk, I will present our experimental demonstration of a proposal to evade this limitation using split detection of correlated photon pairs. The techniques discussed here may prove useful in measurement scenarios requiring high sensitivity at low light intensity.
JQI Seminars are held on Mondays during Fall and Spring semesters at 11:00 a.m. Eastern Time in Room 2400 of the Atlantic Building. University of Maryland affiliates may participate using Zoom. The seminars are also livestreamed on the JQI YouTube channel (https://www.youtube.com/user/JQInews(link is external)(link is external)), which supports audience participation in the chat interface.