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Noise-resistant quantum communications using hyperentanglement

Quantum information protocols are being deployed in increasingly practical scenarios, via optical fibers or free space, alongside classical communications channels. However, entanglement, the most critical resource to deploy to the communicating parties, is also the most fragile to the noise-induced...

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Published in:Optica 2021-12, Vol.8 (12), p.1524
Main Authors: Kim, Jin-Hun, Kim, Yosep, Im, Dong-Gil, Lee, Chung-Hyun, Chae, Jin-Woo, Scarcelli, Giuliano, Kim, Yoon-Ho
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container_issue 12
container_start_page 1524
container_title Optica
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creator Kim, Jin-Hun
Kim, Yosep
Im, Dong-Gil
Lee, Chung-Hyun
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Scarcelli, Giuliano
Kim, Yoon-Ho
description Quantum information protocols are being deployed in increasingly practical scenarios, via optical fibers or free space, alongside classical communications channels. However, entanglement, the most critical resource to deploy to the communicating parties, is also the most fragile to the noise-induced degradations. Here we show that polarization-frequency hyperentanglement of photons can be effectively employed to enable noise-resistant distribution of polarization entanglement through noisy quantum channels. In particular, we demonstrate that our hyperentanglement-based scheme results in an orders-of-magnitude increase in the SNR for distribution of polarization-entangled qubit pairs, enabling quantum communications even in the presence of strong noise that would otherwise preclude quantum operations due to noise-induced entanglement sudden death. While recent years have witnessed tremendous interest and progress in long-distance quantum communications, previous attempts to deal with the noise have mostly been focused on passive noise suppression in quantum channels. Here, via the use of hyperentangled degrees of freedom, we pave the way toward a universally adoptable strategy to enable entanglement-based quantum communications via strongly noisy quantum channels.
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title Noise-resistant quantum communications using hyperentanglement
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