Autoren:	Li, Pei-Zhe Loock, Peter van
Titel:	Memoryless quantum repeaters based on cavity-QED and coherent states
Online-Publikationsdatum:	12-Sep-2023
Erscheinungsdatum:	2023
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	A quantum repeater scheme based on cavity-quantum electrodynamics (QED) and quantum error correction of channel loss via rotation-symmetric bosonic codes (RSBCs) is proposed to distribute atomic entangled states over long distances without memories and at high clock rates. In this scheme, controlled rotation gates, i.e., phase shifts of the propagating light modes conditioned upon the state of an atom placed in a cavity, provide a mechanism both for the entangled-state preparations and for the error syndrome identifications. In order to assess the performance of this repeater protocol, an explicit instance of RSBCs—multicomponent cat codes—are studied quantitatively. It is found that the total fidelity and the success probability for quantum communication over a long distance (such as 1000 km) both can almost approach unity provided a small enough elementary distance between stations (smaller than 0.1 or 0.01 km) and rather low local losses (up to 0.1%) are considered. In a quantum key distribution application, secret key rates can become correspondingly high, both per channel use, beating the repeaterless bound, and per second thanks to the relatively high clock rates of the memoryless scheme. Based upon the cavity-QED setting, this scheme can be realized at room temperature and at optical frequencies.
DDC-Sachgruppe:	530 Physik 530 Physics
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 08 Physik, Mathematik u. Informatik
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9525
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/4.0/
Zeitschrift:	Advanced quantum technologies 6 8
Seitenzahl oder Artikelnummer:	2200151
Verlag:	Wiley-VCH
Verlagsort:	Weinheim
Erscheinungsdatum:	2023
ISSN:	2511-9044
DOI der Originalveröffentlichung:	10.1002/qute.202200151
Enthalten in den Sammlungen:	DFG-491381577-H