skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Linear optical scheme for error-free entanglement distribution and a quantum repeater

Abstract

We present a linear optical scheme for error-free distribution of two-photon polarization-entangled Bell states over noisy channels. The scheme can be applied to an elementary quantum repeater protocol with potentially significant improvements in efficiency and system complexity. The scheme is based on the use of polarization and time-bin encoding of photons and can perform single-pair, single-step purification with currently available technology.

Authors:
 [1]
  1. Institute for Ultrafast Spectroscopy and Lasers, City College of the City University of New York, 138 Street and Convent Avenue, New York, New York 10031 (United States)
Publication Date:
OSTI Identifier:
20787323
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.73.054304; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; BELL THEOREM; DATA TRANSMISSION; DISTRIBUTION; EFFICIENCY; ERRORS; PHOTONS; POLARIZATION; QUANTUM ENTANGLEMENT

Citation Formats

Kalamidas, Demetrios. Linear optical scheme for error-free entanglement distribution and a quantum repeater. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.0.
Kalamidas, Demetrios. Linear optical scheme for error-free entanglement distribution and a quantum repeater. United States. doi:10.1103/PHYSREVA.73.0.
Kalamidas, Demetrios. Mon . "Linear optical scheme for error-free entanglement distribution and a quantum repeater". United States. doi:10.1103/PHYSREVA.73.0.
@article{osti_20787323,
title = {Linear optical scheme for error-free entanglement distribution and a quantum repeater},
author = {Kalamidas, Demetrios},
abstractNote = {We present a linear optical scheme for error-free distribution of two-photon polarization-entangled Bell states over noisy channels. The scheme can be applied to an elementary quantum repeater protocol with potentially significant improvements in efficiency and system complexity. The scheme is based on the use of polarization and time-bin encoding of photons and can perform single-pair, single-step purification with currently available technology.},
doi = {10.1103/PHYSREVA.73.0},
journal = {Physical Review. A},
number = 5,
volume = 73,
place = {United States},
year = {Mon May 15 00:00:00 EDT 2006},
month = {Mon May 15 00:00:00 EDT 2006}
}
  • We construct a theory of continuous-variable entanglement-assisted quantum error correction. We present an example of a continuous-variable entanglement-assisted code that corrects for an arbitrary single-mode error. We also show how to implement encoding circuits using passive optical devices, homodyne measurements, feedforward classical communication, conditional displacements, and off-line squeezers.
  • The applications of AlGaAs semiconductor laser preamplifier and linear repeaters in single mode optical fiber transmission systems were studied through the baseband signal-to-noise ratio and bit error rate performance measurement. Experiments were carried out with the Fabry-Perot cavity laser amplifiers whose characteristics are improved by reducing the input mirror reflectivity to 6 percent. The use of a preamplifier improves the minimum detectable power by 7.4 dB over the Si-APD direct detection level when the received signal is amplified by 30 dB before photodetection. The use of two linear repeaters increases the regenerative repeater gain by 37 dB. These experimental resultsmore » are in good agreement with theoretical predictions based on the photon statistic master equation analysis.« less
  • We report an experimental demonstration of effective entanglement in a prepare-and-measure type of quantum key distribution protocol. Coherent polarization states and heterodyne measurement to characterize the transmitted quantum states are used, thus enabling us to reconstruct directly their Q function. By evaluating the excess noise of the states, we experimentally demonstrate that they fulfill a nonseparability criterion previously presented by Rigas et al. [J. Rigas, O. Guehne, and N. Luetkenhaus, Phys. Rev. A 73, 012341 (2006)]. For a restricted eavesdropping scenario, we predict key rates using postselection of the heterodyne measurement results.
  • We study the mechanism and complexity of an efficient quantum repeater, employing double-photon guns, for long-distance optical quantum communication. The guns create polarization-entangled photon pairs on demand. One such source might be a semiconducter quantum dot, which has the distinct advantage over parametric down-conversion that the probability of creating a photon pair is close to 1, while the probability of creating multiple pairs vanishes. The swapping and purifying components are implemented by polarizing beam splitters and probabilistic optical controlled-NOT gates. We also show that the bottleneck in the efficiency of this repeater is due to detector losses.
  • We present a detailed analysis of a robust quantum repeater architecture building on the original Duan-Lukin-Cirac-Zoller (DLCZ) protocol [L.M. Duan et al. Nature (London) 414, 413 (2001)]. The architecture is based on two-photon Hong-Ou-Mandel-type interference which relaxes the long-distance interferometric stability requirements by about seven orders of magnitude, from subwavelength for the single photon interference required by DLCZ to the coherence length of the photons, thereby removing the weakest point in the DLCZ scheme. Our proposal provides an exciting possibility for robust and realistic long-distance quantum communication.