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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