Parallel distributed quantum gates for dual-species quantum emitters

TL;DR

This paper introduces a scalable protocol for implementing distributed nonlocal quantum gates between dual-species quantum emitters using entangled photon pairs, enhancing quantum network capabilities.

Contribution

It presents a novel parallel protocol that connects spatially separated dual-species qubits without needing quantum frequency conversion or preshared entanglement.

Findings

Feasibility of implementing parallel nonlocal gates with a single high-dimensional entangled photon pair.

Protocol maintains resource efficiency and always-ready property for quantum networks.

Enhances quantum capacity via optical qudit encoding.

Abstract

We propose a parallel protocol for implementing distributed nonlocal quantum gates between spatially separated stationary qubits encoded in dual-species quantum emitters (i.e., color-center and superconducting qubits). By utilizing entangled photon pairs with distinct frequencies as a quantum data bus, our approach connects spatially separated devices without requiring quantum frequency conversion or preshared entanglement, while maintaining an always-ready and resource-efficient property for distributed quantum computing and networks. Furthermore, we demonstrate the feasibility of implementing parallel distributed nonlocal quantum gates on multiple pairs of spatially separated qubits using a single high-dimensional entangled photon pair, which directly benefits from the enhanced quantum capacity provided by optical qudit encoding. Our protocol establishes a scalable and practically implementable framework for distributed quantum networks, potentially enabling the development of future large-scale quantum computing architectures.