Phase sensing beyond standard quantum limit with a truncated SU(1,1) interferometer
P. Gupta, Brian E. Anderson, Bonnie L. Schmittberger, Travis Horrom, Carla Hermann-Avigliano, Kevin M. Jones, Paul D. Lett · Conference on Lasers and Electro-Optics · 2017
We present an SU(1,1) interferometer variation where the second nonlinear interaction is replaced with homodyne detection. Sensitivity measurements as a function of phase demonstrate that our device beats the standard quantum limit by 4dB.