1,396 research outputs found
Single-photon-assisted entanglement concentration of a multi-photon system in a partially entangled W state with weak cross-Kerr nonlinearity
We propose a nonlocal entanglement concentration protocol (ECP) for
-photon systems in a partially entangled W state, resorting to some
ancillary single photons and the parity-check measurement based on cross-Kerr
nonlinearity. One party in quantum communication first performs a parity-check
measurement on her photon in an -photon system and an ancillary photon, and
then she picks up the even-parity instance for obtaining the standard W state.
When she obtains an odd-parity instance, the system is in a less-entanglement
state and it is the resource in the next round of entanglement concentration.
By iterating the entanglement concentration process several times, the present
ECP has the total success probability approaching to the limit in theory. The
present ECP has the advantage of a high success probability. Moreover, the
present ECP requires only the -photon system itself and some ancillary
single photons, not two copies of the systems, which decreases the difficulty
of its implementation largely in experiment. It maybe have good applications in
quantum communication in future.Comment: 7 pages, 3 figure
Distribution of organochlorine pesticides in a sediment profile of the Pearl River estuary
Author name used in this publication: X. D. LiAuthor name used in this publication: B. X. MaiAuthor name used in this publication: G. ZhangAuthor name used in this publication: G. Y. ShengAuthor name used in this publication: J. M. FuAuthor name used in this publication: O. W. H. WaiAuthor name used in this publication: Y. S. Li2001-2002 > Academic research: refereed > Publication in refereed journalAccepted ManuscriptPublishe
Ethyl 3-(2,4-difluoroÂphenÂoxy)-2-(4-methoxyÂphenÂyl)acrylate
In the title molÂecule, C18H16F2O4, the two benzene rings form a dihedral angle of 55.2â
(2)°. In the crystal structure, weak interÂmolecular CâHâŻO hydrogen bonds link the molÂecules into chains propagating along the c axis
Efficient polarization entanglement concentration for electrons with charge detection
We present an entanglement concentration protocol for electrons based on
their spins and their charges. The combination of an electronic polarizing beam
splitter and a charge detector functions as a parity check device for two
electrons, with which the parties can reconstruct maximally entangled electron
pairs from those in a less-entanglement state nonlocally. This protocol has a
higher efficiency than those based on linear optics and it does not require the
parties to know accurately the information about the less-entanglement state,
which makes it more convenient in a practical application of solid quantum
computation and communication.Comment: 4 pages, 2 figure
- âŠ