Multiphoton quantum metrology without pre-and post-selected measurements
Chenglong You, Thomas Gerrits, Peter Bierhorst, Adriana E. Lita, Scott Glancy, Narayan Prasad Bhusal, Jonathan P. Dowling, Emanuel H. Knill, Sae Woo Nam, Richard P. Mirin, Omar S. Magaña‐Loaiza · 2019
We demonstrate the first protocol for quantum-enhanced phase estimation without pre- and post-selected measurements. Our experiment, with an overall efficiency of 82%, utilizes two-mode squeezed vacuum states and photon-number-resolving detection to surpass the standard quantum limit.