Restoring Quantum Communication Efficiency over High Loss Optical Fibers.
Phys Rev Lett
; 129(18): 180501, 2022 Oct 28.
Article
em En
| MEDLINE
| ID: mdl-36374682
ABSTRACT
In the absence of quantum repeaters, quantum communication proved to be nearly impossible across optical fibers longer than â³20 km due to the drop of transmissivity below the critical threshold of 1/2. However, if the signals fed into the fiber are separated by a sufficiently short time interval, memory effects must be taken into account. In this Letter, we show that by properly accounting for these effects it is possible to devise schemes that enable unassisted quantum communication across arbitrarily long optical fibers at a fixed positive qubit transmission rate. We also demonstrate how to achieve entanglement-assisted communication over arbitrarily long distances at a rate of the same order of the maximum achievable in the unassisted noiseless case.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Itália