Direct Quantum Communications in the Presence of Realistic Noisy Entanglement

TL;DR

This paper introduces a direct quantum communication scheme that operates effectively with realistic noisy entanglement, reducing delays and improving error rates compared to traditional methods, thus advancing quantum internet capabilities.

Contribution

It presents a novel direct quantum communication method that bypasses entanglement distillation, enabling faster and more efficient quantum information transfer with noisy entanglement.

Findings

Improves quantum bit error ratio (QBER) despite noisy entanglement

Reduces quantum gate requirements compared to existing schemes

Achieves competitive yield and goodput in quantum communication

Abstract

To realize the Quantum Internet, quantum communications require pre-shared entanglement among quantum nodes. However, both the generation and the distribution of the maximally-entangled quantum states are inherently contaminated by quantum decoherence. Conventionally, the quantum decoherence is mitigated by performing the consecutive steps of quantum entanglement distillation followed by quantum teleportation. However, this conventional approach imposes a long delay. To circumvent this impediment, we propose a novel quantum communication scheme relying on realistic noisy pre-shared entanglement, which eliminates the sequential steps imposing delay in the standard approach. More precisely, our proposed scheme can be viewed as a direct quantum communication scheme capable of improving the quantum bit error ratio (QBER) of the logical qubits despite relying on realistic noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive QBER, yield, and goodput compared to the existing state-of-the-art quantum communication schemes, despite requiring fewer quantum gates.