SU(1,1) interferometry takes advantage of the reduced noise in the correlations of two-mode squeezed states. I recast SU(1,1) interferometry as a way of making simultaneous back-action-evading measurements of both components of the displacement of a harmonic oscillator, exactly equivalent to measuring the two displacement components on separate modes subjected to the same displacement. I then discuss how the same correlations can be used in two scenarios not usually thought of in terms of SU(1,1) interferometry: quantum illumination and characterization of the linear-optical network in randomized boson sampling.

Bio:

Carlton M. Caves is a Research Professor and Distinguished Professor Emeritus in the Department of Physics and Astronomy at the University of New Mexico. Caves received the PhD in Physics from the California Institute of Technology in 1979; worked at Caltech as a postdoctoral Research Fellow through 1981 and as a Senior Research Fellow in Theoretical Physics from 1982 through 1987; was Associate Professor of Electrical Engineering and Physics at the University of Southern California from 1988 till 1992, and moved to UNM as Professor of Physics and Astronomy in 1992. Promoted to Distinguished Professor in 2006, Caves was Director of the Center for Quantum Information and Control from 2009 to 2018. The author of over 140 scientific papers on topics in gravitation theory, quantum optics, nonlinear dynamics, quantum foundations, and quantum information science, Caves has focused for the last fifteen years on research in quantum metrology and quantum information theory; now retired from teaching and administration, Caves works on research that contributes to personal pursuit of happiness. Caves is a Fellow of the American Physical Society and the American Association for the Advancement of Science.