https://doi.org/10.1140/epjd/e2009-00237-y
Multipartite entanglement purification with quantum nondemolition detectors
1
Key Laboratory of Beam Technology and Material
Modification of Ministry of Education, Beijing Normal University, Beijing, 100875, P.R. China
2
College of Nuclear Science and Technology, Beijing Normal
University, Beijing, 100875, P.R. China
3
Beijing Radiation Center, Beijing, 100875, P.R. China
4
Department of Physics, Applied Optics Beijing Area Major
Laboratory, Beijing Normal University, Beijing, 100875, P.R. China
Corresponding author: a fgdeng@bnu.edu.cn
Received:
22
March
2009
Revised:
24
July
2009
Published online:
22
August
2009
We present a scheme for multipartite entanglement purification of quantum systems in a Greenberger-Horne-Zeilinger state with quantum nondemolition detectors (QNDs). This scheme does not require the controlled-not gates which cannot be implemented perfectly with linear optical elements at present, but QNDs based on cross-Kerr nonlinearities. It works with two steps, i.e., the bit-flipping error correction and the phase-flipping error correction. These two steps can be iterated perfectly with parity checks and simple single-photon measurements. This scheme does not require the parties to possess sophisticated single photon detectors. These features maybe make this scheme more efficient and feasible than others in practical applications.
PACS: 03.67.Pp – Quantum error correction and other methods for protection against decoherence / 03.67.Hk – Quantum communication
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009