Authors:	Li, Pei-Zhe Loock, Peter van
Title:	Memoryless quantum repeaters based on cavity-QED and coherent states
Online publication date:	12-Sep-2023
Year of first publication:	2023
Language:	english
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:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9525
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Advanced quantum technologies 6 8
Pages or article number:	2200151
Publisher:	Wiley-VCH
Publisher place:	Weinheim
Issue date:	2023
ISSN:	2511-9044
Publisher DOI:	10.1002/qute.202200151
Appears in collections:	DFG-491381577-H