Nonorthogonal coding in spectrally-entangled photons

TL;DR

This paper proposes a nonorthogonal spectral coding scheme for entangled photons to enhance quantum communication capacity, demonstrating its potential for large-scale, multiuser quantum information transfer.

Contribution

It introduces a novel nonorthogonal coding architecture for spectral modes of entangled photons, enabling higher capacity quantum communication beyond traditional orthogonal schemes.

Findings

Demonstrated encoding and decoding of quantum information beyond orthogonal coding.

Quantified performance using second-order correlation measures.

Showed applicability to large-scale, multiuser quantum networks.

Abstract

Controlling and engineering continuous spectral modes of entangled photons represents one of the promising approaches toward secure quantum communications. By using the telecom bandwidth generated from a cascade-emitted biphoton in atomic ensembles, a fiber-based long-distance quantum communication can be feasible owing to its low transmission loss. With multiplexed photon pairs, we propose to implement a nonorthogonal coding scheme in their spectral modes and present an architecture of multiple channels enabling a high-capacity transfer of codewords. Using the measures of the second-order correlations and associated visibility and contrast, we further quantify the performance of the proposed nonorthogonal coding scheme. Our results demonstrate the capability to encode and decode quantum information beyond the orthogonal coding scheme. The proposed scheme here can be applicable to a large-scale and multiuser quantum communication and pave the way toward an efficient and functional quantum information processing.