Controllable entangled state distribution in a dual-rail reconfigurable optical network

TL;DR

This paper presents a reconfigurable optical network architecture that enables controlled distribution of entangled states across multiple quantum nodes, enhancing flexibility for quantum communication and computing applications.

Contribution

The authors introduce a novel quantum network design that allows dynamic control of entangled state propagation using linear optics and phase shifters, extending to multi-node configurations.

Findings

Demonstrated control of entangled state distribution via phase shifters

Extended the scheme to multi-mode network structures

Showed reconfigurable network configurations with time-dependent phase adjustments

Abstract

Reconfigurable distribution of entangled states is essential for operation of quantum networks connecting multiple devices such as quantum memories and quantum computers. We introduce new quantum distribution network architecture enabling control of the entangled state propagation direction using linear-optical devices and phase shifters and offering reconfigurable connections between multiple quantum nodes. The basic two-photon entanglement distribution scheme is first introduced to illustrate the principle of operation. The scheme is then extended to a network structure with increased number of spatial modes connecting potential end-users. We present several examples of controllable network configuration modifications using time-dependent phase shifters.