Efficient polarization-entanglement purification based on parametric down-conversion sources with cross-Kerr nonlinearity

Yu-Bo Sheng, Fu-Guo Deng, and Hong-Yu Zhou

Phys. Rev. A 77, 042308 – Published 9 April 2008; Erratum Phys. Rev. A 77, 059902 (2008)

Abstract

We present a way for entanglement purification based on two parametric down-conversion (PDC) sources with cross-Kerr nonlinearities. It is comprised of two processes. The first one is a primary entanglement purification protocol for PDC sources with nondestructive quantum nondemolition (QND) detectors by transferring the spatial entanglement of photon pairs to their polarization. In this time, the QND detectors act as the role of controlled-NOT (CNOT) gates. Also they can distinguish the photon number of the spatial modes, which provides a good way for the next process to purify the entanglement of the photon pairs kept more. In the second process for entanglement purification, new QND detectors are designed to act as the role of CNOT gates. This protocol has the advantage of high yield and it requires neither CNOT gates based on linear optical elements nor sophisticated single-photon detectors, which makes it more convenient in practical applications.

Received 8 February 2008

DOI:https://doi.org/10.1103/PhysRevA.77.042308

Erratum

Erratum: Efficient polarization-entanglement purification based on parametric down-conversion sources with cross-Kerr nonlinearity [Phys. Rev. A 77, 042308 (2008)]

Yu-Bo Sheng, Fu-Guo Deng, and Hong-Yu Zhou

Phys. Rev. A 77, 059902 (2008)

Authors & Affiliations

Yu-Bo Sheng^1,2, Fu-Guo Deng^1,3, and Hong-Yu Zhou^1,2

¹The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875, People’s Republic of China
²Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875, People’s Republic of China
³Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, People’s Republic of China

^*fgdeng@bnu.edu.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 77, Iss. 4 — April 2008

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review A

covering atomic, molecular, and optical physics and quantum information