Hybrid quantum repeater protocol with fast local processing

Johannes Borregaard; Jonatan Bohr Brask; Anders Søndberg Sørensen

doi:10.1103/PhysRevA.86.012330

Hybrid quantum repeater protocol with fast local processing

Johannes Borregaard, Jonatan Bohr Brask, Anders Søndberg Sørensen

Kvanteoptik

2 Citationer (Scopus)

Abstract

We propose a hybrid quantum repeater protocol combining the advantages of continuous and discrete variables. The repeater is based on the previous work of Brask but we present two ways of improving this protocol. In the previous protocol entangled single-photon states are produced and grown into superpositions of coherent states, known as two-mode cat states. The entanglement is then distributed using homodyne detection. To improve the protocol, we replace the time-consuming nonlocal growth of cat states with local growth of single-mode cat states, eliminating the need for classical communication during growth. Entanglement is generated in subsequent connection processes. Furthermore the growth procedure is optimized. We review the main elements of the original protocol and present the two modifications. Finally the two protocols are compared and the modified protocol is shown to perform significantly better than the original protocol.

Originalsprog	Engelsk
Tidsskrift	Physical Review A
Vol/bind	86
Udgave nummer	1
Sider (fra-til)	012330
Antal sider	12
ISSN	2469-9926
DOI	https://doi.org/10.1103/PhysRevA.86.012330
Status	Udgivet - 26 jul. 2012

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10.1103/PhysRevA.86.012330

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AU - Brask, Jonatan Bohr

AU - Sørensen, Anders Søndberg

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N2 - We propose a hybrid quantum repeater protocol combining the advantages of continuous and discrete variables. The repeater is based on the previous work of Brask but we present two ways of improving this protocol. In the previous protocol entangled single-photon states are produced and grown into superpositions of coherent states, known as two-mode cat states. The entanglement is then distributed using homodyne detection. To improve the protocol, we replace the time-consuming nonlocal growth of cat states with local growth of single-mode cat states, eliminating the need for classical communication during growth. Entanglement is generated in subsequent connection processes. Furthermore the growth procedure is optimized. We review the main elements of the original protocol and present the two modifications. Finally the two protocols are compared and the modified protocol is shown to perform significantly better than the original protocol.

AB - We propose a hybrid quantum repeater protocol combining the advantages of continuous and discrete variables. The repeater is based on the previous work of Brask but we present two ways of improving this protocol. In the previous protocol entangled single-photon states are produced and grown into superpositions of coherent states, known as two-mode cat states. The entanglement is then distributed using homodyne detection. To improve the protocol, we replace the time-consuming nonlocal growth of cat states with local growth of single-mode cat states, eliminating the need for classical communication during growth. Entanglement is generated in subsequent connection processes. Furthermore the growth procedure is optimized. We review the main elements of the original protocol and present the two modifications. Finally the two protocols are compared and the modified protocol is shown to perform significantly better than the original protocol.

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JO - Physical Review A - Atomic, Molecular, and Optical Physics

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Hybrid quantum repeater protocol with fast local processing

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