Homodyne detection is optimal for quantum interferometry with path-entangled coherent states
Z. M. McIntyre, W. A. Coish · Physical Review A · 2024
The authors propose the use of homodyne detection to detect phase shifts and show that this method is optimal for path-entangled coherent states. This is notable because homodyne measurements do not require photon counting, and the resulting sensitivity is independent of the value of the phase shift itself.