Volume 107, Number 5, September 2014
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||09 September 2014|
Entanglement distribution in optical fibers assisted by nonlocal memory effects
1 Key Laboratory of Quantum Information, University of Science and Technology of China, CAS Hefei, 230026, China
2 Physikalisches Institut, Universität Freiburg - Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany
3 QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University P.O. Box 13500, FI-00076 Aalto, Finland
4 Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku FI-20014 Turun yliopisto, Finland
Received: 5 June 2014
Accepted: 22 August 2014
The successful implementation of several quantum information and communication protocols requires distributing entangled pairs of quantum bits in a reliable manner. While there exists a substantial amount of recent theoretical and experimental activities dealing with non-Markovian quantum dynamics, experimental application and verification of the usefulness of memory effects for quantum information tasks are still missing. We combine these two aspects and show experimentally that a recently introduced concept of nonlocal memory effects allows to protect and distribute polarization entangled pairs of photons in an efficient manner within polarization-maintaining (PM) optical fibers. The introduced scheme is based on correlating the environments, i.e. frequencies of the polarization entangled photons, before their physical distribution. When comparing to the case without nonlocal memory effects, we demonstrate at least a 12-fold improvement in the channel, or fiber length, for preserving the highly entangled initial polarization states of photons against dephasing.
PACS: 42.50.-p – Quantum optics / 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.67.-a – Quantum information
© EPLA, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.