TY - JOUR

T1 - Parameter regimes for a single sequential quantum repeater

AU - Rozpȩdek, F.

AU - Goodenough, K.

AU - Ribeiro, J.

AU - Kalb, N.

AU - Vivoli, V. Caprara

AU - Reiserer, A.

AU - Hanson, R.

AU - Wehner, S.

AU - Elkouss, D.

N1 - Accepted Author Manuscript

PY - 2018/4

Y1 - 2018/4

N2 - Quantum key distribution allows for the generation of a secret key between distant parties connected by a quantum channel such as optical fibre or free space. Unfortunately, the rate of generation of a secret key by direct transmission is fundamentally limited by the distance. This limit can be overcome by the implementation of so-called quantum repeaters. Here, we assess the performance of a specific but very natural setup called a single sequential repeater for quantum key distribution. We offer a fine-grained assessment of the repeater by introducing a series of benchmarks. The benchmarks, which should be surpassed to claim a working repeater, are based on finite-energy considerations, thermal noise and the losses in the setup. In order to boost the performance of the studied repeaters we introduce two methods. The first one corresponds to the concept of a cut-off, which reduces the effect of decoherence during the storage of a quantum state by introducing a maximum storage time. Secondly, we supplement the standard classical post-processing with an advantage distillation procedure. Using these methods, we find realistic parameters for which it is possible to achieve rates greater than each of the benchmarks, guiding the way towards implementing quantum repeaters.

AB - Quantum key distribution allows for the generation of a secret key between distant parties connected by a quantum channel such as optical fibre or free space. Unfortunately, the rate of generation of a secret key by direct transmission is fundamentally limited by the distance. This limit can be overcome by the implementation of so-called quantum repeaters. Here, we assess the performance of a specific but very natural setup called a single sequential repeater for quantum key distribution. We offer a fine-grained assessment of the repeater by introducing a series of benchmarks. The benchmarks, which should be surpassed to claim a working repeater, are based on finite-energy considerations, thermal noise and the losses in the setup. In order to boost the performance of the studied repeaters we introduce two methods. The first one corresponds to the concept of a cut-off, which reduces the effect of decoherence during the storage of a quantum state by introducing a maximum storage time. Secondly, we supplement the standard classical post-processing with an advantage distillation procedure. Using these methods, we find realistic parameters for which it is possible to achieve rates greater than each of the benchmarks, guiding the way towards implementing quantum repeaters.

KW - quantum communication

KW - quantum key distribution

KW - quantum networks

KW - quantum repeaters

UR - http://www.scopus.com/inward/record.url?scp=85049404153&partnerID=8YFLogxK

U2 - 10.1088/2058-9565/aab31b

DO - 10.1088/2058-9565/aab31b

M3 - Article

AN - SCOPUS:85049404153

VL - 3

JO - Quantum Science and Technology

JF - Quantum Science and Technology

SN - 2058-9565

IS - 3

M1 - 034002

ER -