Fig. 3: Optimal multimode displacement sensing with squeezed vacuum states.
From: Multiparameter squeezing for optimal quantum enhancements in sensor networks
The passive transformation \({\hat{U}}_{O}\) decouples the initial multimode squeezed vacuum state into local squeezed states. A displacement generated by the anti-squeezed variance (here depicted as \(\hat{p}\)) and a measurement of the squeezed variance (\(\hat{x}\)) is implemented in each mode with the aid of a local oscillator.
