Entanglement Transfer Through Arrays of Cavities Coupled by Optical Fibers

Abstract

We propose a scheme of entanglement transfer through two independent arrays of cavities coupled by optical fibers when each of the cavities contains a single two-level atom. We study the entanglement dynamics of the transferred states and find the explicit expression for the density matrix and concurrence. It is shown that the amount of the transferred entanglement has a direct connection with the target states and the lengths of the arrays of cavities. Moreover, the influence of the initial states and the length of the arrays of cavities on the phenomenon of entanglement sudden death is also investigated.

Propagation and distribution of quantum correlations in a cavity QED network

“…We have two identical chains of three cavities joined by optical fibres as shown in figure 1, where each cavity interacts with a single atom and its own reservoir. A similar model was used by Zhang et al [23] but without losses. We model our system in the short fibre limit 2lμ/2π c 1, where l is the length of the fibre and μ is the decay rate of the cavity fields into a continuum of fibre modes [24].…”

Quantum correlations in cavity QED networks

“…The ideas of quantum network with optical fibers was developed for arrays of cavities QED [26], where the same protocol of coupling is used. The phenomenon of entanglement sudden death (ESD) was observed, where the influence of the initial state preparation of the system plays an important role.…”

“…As was shown, even when cavities and fibers are lossy, that is connected to reservoirs, one can still transfer successfully the quantum information between locally distinct nodes (atoms) of the quantum network. The ideas of quantum network with optical fibers was developed for arrays of cavities QED [26], where the same protocol of coupling is used. The phenomenon of entanglement sudden death (ESD) was observed, where the influence of the initial state preparation of the system plays an important role.…”

“…A straight generalization of the one chain model was studied by Zhang et al [26], proposing a system with two non-interacting chains, see Fig. 9.…”

Propagation and Distribution of Quantum Correlations in a Cavity QED Network

“…1, where each cavity interacts with a single atom and it's own reservoir. A similar model was used by Zhang et al [23] but without losses. We model our system in short fiber limit 2lµ/2πc ≪ 1, where l is the length of the fiber and µ is the decay rate of the cavity fields into a continuum of fiber modes [24].…”