Generation and protection of a maximally entangled state between many modes in an optical network with dissipation

Abstract

We present a three-cavity network model with two modes in each cavity and a non-linear medium that generates a Kerr type interaction via both self-phase and cross-phase modulation processes. We have two main goals. The first one is to generate a multipartite Maximally Entangled State (MES), starting from the ground state of the system. We address the problem both without and with dissipation. Secondly, we want to protect the MES from decoherence. While studying the MES, we analyze different bipartite and multipartite entanglement measures. We also study the effect of an Avoided Level Crossing (ALC) identified by the critical behavior of the entanglement measures, thus showing that the quantum correlations act as a witness for such phenomena. Our findings provide the quantum tools to perform the operation of generation and protection of a maximally entangled state in a cavity QED environment.

Decoherence-free quantum register of nuclear spins in diamond

“…Maximally entangled eigenstates with zero eigenvalue are exceptional for quantum information, since they are robust to random fluctuations in magnetic fields that originates dephasing noise. Preparation of such states have been already proposed for ultracold atoms [40] and cavity QED lattice [41]. Here, the ancilla spin (NV − ) that is used for control and readout, it is also well isolated from external magnetic noise as being in the m s = 0 state.…”

Enhancement of the entanglement generation via randomly perturbed series of external pulses in a nonlinear Bose–Hubbard dimer

“…It should be emphasized that the Bose-Hubbard model we propose is general enough to describe various physical systems in which the phenomenon of quantum entanglement can be observed. For instance, entangled states can appear in Bose-Einstein condensates [39][40][41], quantum dots [42,43], trapped ions [44], atoms inside an optical cavity [45,46] and in many others [47][48][49][50][51][52].…”

The Entanglement Generation in P T -Symmetric Optical Quadrimer System

“…The generation of entanglement in various quantum systems is one of the fundamental areas of interest in quantum information theory. Entanglement can be observed in various physical systems such as Bose-Einstein condensates [26,27], cavity QED [28], quantum dots [29,30], trapped ions [31], and many others [32][33][34][35][36][37]. The research related to the production of entanglement in open systems is of particular importance.…”