Direct Quantum Communications in the Presence of Realistic Noisy Entanglement

To realize the Quantum Internet, quantum communications require pre-shared entanglement among quantum nodes. However, the generation and the distribution of the entanglement 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 flawless operation, despite relying on noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive qubit error ratio, yield, and goodput over the existing state-of-the-art quantum communication schemes, despite requiring fewer quantum gates.