Multipartite continuous-variable quantum nondemolition interaction and entanglement certification and monitoring

Abstract

The quantum nondemolition (QND) measurement is one of the most studied quantum measurement procedures. Usually, such process involves the coupling of a single system of interest, called signal, with a single probe system, so that the relevant information in the signal system is indirectly measured by observing the probe system. Here, we extend the concept of quantum nondemolition interaction to the cases in which the signal and the probe systems are each one multipartite continuous-variable systems. Specifically, we propose a general scheme that performs the multipartite QND interactions, relying on beam-splitter couplings among the signal and probe modes with ancillary modes prepared off-line in squeezed states. The scheme is also composed by homodyne detections and feedforward modulations. The ancillary modes are detected in the process, providing photocurrents for post-modulation of the output systems, as well as sufficient information to calculate genuine multipartite entanglement conditions of the input systems and to monitor similar conditions of the output systems.