Photonic Networking of Quantum Memories in High-Dimensions

TL;DR

This paper demonstrates a quantum network using high-dimensional atomic memories, enabling enhanced quantum information capacity and higher entanglement success rates compared to traditional qubit systems.

Contribution

It introduces a method for entangling high-dimensional atomic qudits via photon interference, expanding quantum network capabilities beyond qubit limitations.

Findings

Successful generation of maximally-entangled Bell states in high-dimensional atomic qudits

Enhanced entanglement success fraction exceeding 50%

Demonstration of high-dimensional quantum networking with atomic memories

Abstract

Quantum networking enables the exchange of quantum information between physically separated quantum systems, which has applications ranging from quantum computing to unconditionally secure communication. Such quantum information is generally represented by two-level quantum systems or qubits. Here, we demonstrate a quantum network of high-dimensional (HD) quantum memories or ``qudits" stored in individual atoms. The interference and detection of HD time-bin encoded single photons emitted from atomic qudit memories heralds maximally-entangled Bell states across pairs of atomic qudit levels. This approach expands the quantum information capacity of a quantum network while improving the entanglement success fraction beyond the standard 50\% limit of qubit-based measurement protocols.