Quantum Key Distribution over Probabilistic Quantum Repeaters

TL;DR

This paper evaluates the performance of DLCZ quantum repeaters for long-distance quantum key distribution, analyzing throughput, fidelity, and optimal parameters to enhance secure communication over extended distances.

Contribution

It provides a detailed calculation of entanglement throughput and fidelity considering practical inefficiencies, and identifies optimal repeater configurations and excitation probabilities for QKD.

Findings

Reveals the crossover distance where repeaters outperform direct transmission.

Identifies the optimal excitation probability for maximum QKD rate.

Quantifies the impact of losses and multiple excitations on entanglement quality.

Abstract

A feasible route towards implementing long-distance quantum key distribution (QKD) systems relies on probabilistic schemes for entanglement distribution and swapping as proposed in the work of Duan, Lukin, Cirac, and Zoller (DLCZ) [Nature 414, 413 (2001)]. Here, we calculate the conditional throughput and fidelity of entanglement for DLCZ quantum repeaters, by accounting for the DLCZ self-purification property, in the presence of multiple excitations in the ensemble memories as well as loss and other sources of inefficiency in the channel and measurement modules. We then use our results to find the generation rate of secure key bits for QKD systems that rely on DLCZ quantum repeaters. We compare the key generation rate per logical memory employed in the two cases of with and without a repeater node. We find the cross-over distance beyond which the repeater system outperforms the non-repeater one. That provides us with the optimum inter-node distancing in quantum repeater systems. We also find the optimal excitation probability at which the QKD rate peaks. Such an optimum probability, in most regimes of interest, is insensitive to the total distance.