Abstract
Quantum networks provide a prominent platform for realizing quantum information processing and quantum communication, with entanglement being a key resource in such applications. Here, we describe the dissipative transport protocol for entangled states, where entanglement stored in the first node of quantum network can be transported with high fidelity to the second node via a 1D chiral waveguide. In particular, we exploit the directional asymmetry in chirally-coupled single-mode ring resonators to transport entangled states. For the fully chiral waveguide, Bell states, multipartite $W$-states and and Dicke states can be transported with fidelity as high as $0.954$, despite the fact that the communication channel is noisy. Our proposal can be utilized for long-distance distribution of multipartite entangled states between the quantum nodes of the open quantum network.
Highlights
Quantum networks [1,2] are essential for realizing distributed quantum computing and large-scale quantum communication, with entanglement being a key resource in such applications
In this paper we have proposed a protocol for transporting entanglement between the two nodes in an open quantum network, where we demonstrated that dissipation can be useful to achieve the task, contrary to the common notion that dissipation creates decoherence
By coupling ring cavities with a chiral 1D waveguide, we demonstrated entanglement transport, with the entangled state stored in the atomic ensembles which are coupled to the ring cavities
Summary
Quantum networks [1,2] are essential for realizing distributed quantum computing and large-scale quantum communication, with entanglement being a key resource in such applications. Spin chains can alleviate the issue of sensitive control of system parameters and realize quantum systems with minimal control (coupling constants are fixed in time) and entanglement transfer has been demonstrated in several theoretical papers [21,22,23,24,25,26,27,28] in Heisenberg-type spin chains. Chirality arises, for instance, in atom-waveguide coupled systems when the symmetry of photon emission in the left and right directions is broken [29] This effect appears as a result of spin-orbit coupling and has been experimentally demonstrated in photonic waveguides [30]. The entanglement transport is not dependent on the distance between the atoms
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