Entangled coherent states for quantum radar applications

Abstract

We propose a new device that can be used to produce entangled states between coherent states, acting like Schrodinger's cat states, useful for a quantum radar technology. The reason to use such states is to get an arbitrary number of photons entangled produced at will. The aim is to improve performance with respect to a common limitation of quantum radar. Such a device, dubbed Cooper-pair box (or charge qubit) in literature, is a well-known system that can be operated through a superconductive Josephson junction. Such states were recently observed in cavity quantum electrodynamics. Here we exploit their experimental implementation in strongly coupled cavities. The reference quantum radar is the one recently studied in experiments compared to a noise radar.