Efficient Optimization of Cut-offs in Quantum Repeater Chains

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

Quantum communication enables the implementation of tasks that are unachievable with classical resources. However, losses on the communication channel preclude the direct long-distance transmission of quantum information in many relevant scenarios. In principle quantum repeaters allow one to overcome losses. However, realistic hardware parameters make long-distance quantum communication a challenge in practice. For instance, in many protocols an entangled pair is generated that needs to wait in quantum memory until the generation of an additional pair. During this waiting time the first pair decoheres, impacting the quality of the final entanglement produced. At the cost of a lower rate, this effect can be mitigated by imposing a cut-off condition. For instance, a maximum storage time for entanglement after which it is discarded. In this work, we optimize the cut-offs for quantum repeater chains. First, we develop an algorithm for computing the probability distribution of the waiting time and fidelity of entanglement produced by repeater chain protocols which include a cut-off. Then, we use the algorithm to optimize cut-offs in order to maximize secret-key rate between the end nodes of the repeater chain. We find that the use of the optimal cut-off extends the parameter regime for which secret key can be generated and moreover significantly increases the secret-key rate for a large range of parameters.

Original languageEnglish
Title of host publicationProceedings - IEEE International Conference on Quantum Computing and Engineering, QCE 2020
EditorsHausi A. Muller, Greg Byrd, Candace Culhane, Erik DeBenedictis, Travis Humble
Place of PublicationPiscataway, NJ, USA
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages158-168
ISBN (Electronic)9781728189697
DOIs
Publication statusPublished - 2020
Event2020 IEEE International Conference on Quantum Computing and Engineering, QCE 2020 - Denver, United States
Duration: 12 Oct 202016 Oct 2020

Publication series

NameProceedings - IEEE International Conference on Quantum Computing and Engineering, QCE 2020

Conference

Conference2020 IEEE International Conference on Quantum Computing and Engineering, QCE 2020
CountryUnited States
CityDenver
Period12/10/2016/10/20

Keywords

  • quantum communication
  • quantum repeater chains

Fingerprint Dive into the research topics of 'Efficient Optimization of Cut-offs in Quantum Repeater Chains'. Together they form a unique fingerprint.

Cite this