EXIT-Chart Aided Near-Capacity Quantum Turbo Code Design

Abstract

The design of Quantum Turbo Codes (QTCs) typically relies on the analysis of their distance spectra, followed by Monte-Carlo simulations. By contrast, in this paper we appropriately adapt the conventional non-binary EXtrinsic Information Transfer (EXIT) charts for quantum turbo codes by exploiting the intrinsic quantum-to-classical isomorphism. The EXIT chart analysis not only allows us to dispense with the time-consuming Monte-Carlo simulations, but also facilitates the design of near-capacity codes without resorting to the analysis of their distance spectra. We have demonstrated that our EXIT chart predictions are in line with the Monte-Carlo simulations results. We have also optimized the entanglement-assisted QTC using EXIT charts, which outperforms the existing distance spectra based QTCs. More explicitly, the performance of our optimized QTC is as close as 0.3 dB to the corresponding hashing bound.

10 pages

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• Multidimensional Manifold Extraction for Multicarrier Continuous-Variable Quantum Key Distribution
• Distribution Statistics and Random Matrix Formalism of Multicarrier Continuous-Variable Quantum Key Distribution
• Decoherence and Quantum Error Correction for Quantum Computing and Communications
• Error Correction for Reliable Quantum Computing