Linear optics schemes for entanglement distribution with realistic single-photon sources

Mikołaj Lasota, Czesław Radzewicz, Konrad Banaszek, and Rob Thew
Phys. Rev. A 90, 033836 – Published 22 September 2014

Abstract

We study the operation of linear optics schemes for entanglement distribution based on nonlocal photon subtraction when input states, produced by imperfect single-photon sources, exhibit both vacuum and multiphoton contributions. Two models for realistic photon statistics with radically different properties of the multiphoton “tail” are considered. The first model assumes occasional emission of double photons and linear attenuation, while the second one is motivated by heralded sources utilizing spontaneous parametric down-conversion. We find conditions for the photon statistics that guarantee generation of entanglement in the relevant qubit subspaces and compare it with classicality criteria. We also quantify the amount of entanglement that can be produced with imperfect single-photon sources, optimized over setup parameters, using as a measure entanglement of formation. Finally, we discuss verification of the generated entanglement by testing Bell's inequalities. The analysis is carried out for two schemes. The first one is the well-established one-photon scheme, which produces a photon in a delocalized superposition state between two nodes, each of them fed with one single photon at the input. As the second scheme, we introduce and analyze a linear optics analog of the robust scheme based on interfering two Stokes photons emitted by atomic ensembles, which does not require phase stability between the nodes.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 15 May 2014

DOI:https://doi.org/10.1103/PhysRevA.90.033836

©2014 American Physical Society

Authors & Affiliations

Mikołaj Lasota*

  • Faculty of Physics, Astronomy and Applied Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Toruń, Poland

Czesław Radzewicz and Konrad Banaszek

  • Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

Rob Thew

  • Group of Applied Physics, University of Geneva, 1211 Geneva 4, Switzerland

  • *Corresponding author: miklas@fizyka.umk.pl

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 3 — September 2014

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×