Relativistic causality imposes rigid restrictions on nondemolition (repeatable) measurements of nonlocal variables. We show that there are no causal restrictions on demolition (nonrepeatable) measurements: all Hermitian operators of multipartite quantum system can be measured instantaneously, provided unlimited supply of entanglement resources.

We derive the form of the Belavkin-Kushner-Stratonovich equation describing the filtering of a continuous observed quantum system via non-demolition measurements when the statistics of the input field used for the indirect measurement are in a general coherent state.

abstract today, due to the rapid growth of population, development of the construction industry is a necessity. all around the world, new subjects such as sustainable development, environmental pollution, conservation of resources, and reduction of co2 emission have become the most important research topics among the scientific societies. in recent years, especially after 1997, new tools were i...

We study possible scenarios for quantum non-demolition measurements using Bose-Einstein condensates. We show that the interactions between condensate atoms makes it possible to measure the atom number with minimal back action on the system. This is an example of atomic nonlinear optics that has significant implications in the quantum state preparation of the Bose condensates. Typeset using REVT...

High-tech digital solutions play a key role in many areas of modern life. The digitalization construction is at the stage development and every year it being introduced more deeply into industry: regulatory documentation developed, platforms for interaction between participants are created, software requirements formed. industry needs professionals who will work information environment througho...