Hybrid quantum repeater protocol with fast local processing

TY - JOUR

T1 - Hybrid quantum repeater protocol with fast local processing

AU - Borregaard, Johannes

AU - Brask, Jonatan Bohr

AU - Sørensen, Anders Søndberg

PY - 2012/7/26

Y1 - 2012/7/26

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.

U2 - 10.1103/PhysRevA.86.012330

DO - 10.1103/PhysRevA.86.012330

M3 - Journal article

SN - 2469-9926

VL - 86

SP - 012330

JO - Physical Review A

JF - Physical Review A

IS - 1

ER -