English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Quantum repeaters using coherent-state communication

MPS-Authors
/persons/resource/persons201222

van Loock,  Peter
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201118

Lutkenhaus,  Norbert
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

van Loock, P., Lutkenhaus, N., Munro, W. J., & Nemoto, K. (2008). Quantum repeaters using coherent-state communication. PHYSICAL REVIEW A, 78(6): 062319. doi:10.1103/PhysRevA.78.062319.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6C53-B
Abstract
We investigate quantum repeater protocols based upon atomic qubit-entanglement distribution through optical coherent-state communication. Various measurement schemes for an optical mode entangled with two spatially separated atomic qubits are considered in order to nonlocally prepare conditional two-qubit entangled states. In particular, generalized measurements for unambiguous state discrimination enable one to completely eliminate spin-flip errors in the resulting qubit states, as they would occur in a homodyne-based scheme due to the finite overlap of the optical states in phase space. As a result, by using weaker coherent states, high initial fidelities can still be achieved for larger repeater spacing, at the expense of lower entanglement generation rates. In this regime, the coherent-state-based protocols start resembling single-photon-based repeater schemes.