Infinite-fold enhancement in communications capacity using pre-shared entanglement

• URL: http://arxiv.org/abs/2001.03934v2
• Date: Sat, 18 Jan 2020 08:08:59 GMT
• Title: Infinite-fold enhancement in communications capacity using pre-shared entanglement
• Authors: Saikat Guha, Quntao Zhuang, Boulat Bash
• Abstract summary: Pre-shared entanglement can significantly boost communication rates in the regime of high thermal noise. We propose a structured design of a quantum transmitter and receiver that can harness this purported infinite-fold capacity enhancement.
• Score: 2.049702429898688
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Pre-shared entanglement can significantly boost communication rates in the regime of high thermal noise, and a low-brightness transmitter. In this regime, the ratio between the entanglement-assisted capacity and the Holevo capacity, the maximum reliable-communication rate permitted by quantum mechanics without any pre-shared entanglement as a resource, is known to scale as $\log(1/N_S)$, where $N_S \ll 1$ is the mean transmitted photon number per mode. This is especially promising in enabling a large boost to radio-frequency communications in the weak-transmit-power regime, by exploiting pre-shared optical-frequency entanglement, e.g., distributed by the quantum internet. In this paper, we propose a structured design of a quantum transmitter and receiver that leverages continuous-variable pre-shared entanglement from a downconversion source, which can harness this purported infinite-fold capacity enhancement---a problem open for over a decade. Finally, the implication of this result to the breaking of the well-known {\em square-root law} for covert communications, with pre-shared entanglement assistance, is discussed.

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