7,154 research outputs found
Quantum dense coding scheme via cavity decay
We investigate a secure scheme for implementing quantum dense coding via
cavity decay and liner optics devices. Our scheme combines two distinct
advantages: atomic qubit sevres as stationary bit and photonic qubit as flying
bit, thus it is suitable for long distant quantum communication.Comment: 5 pages, 2 figure. A revised version, accept for publication in
Journal of Modern Optc
Generation of cluster states
We propose two schemes for the generation of the cluster states. One is based
on cavity quantum electrodynamics (QED) techniques. The scheme only requires
resonant interactions between two atoms and a single-mode cavity. The
interaction time is very short, which is important in view of decoherence.
Furthermore, we also discuss the cavity decay and atomic spontaneous emission
case. The other is based on atomic ensembles. The scheme has inherent fault
tolerance function and is robust to realistic noise and imperfections. All the
facilities used in our schemes are well within the current technology.Comment: Complete rewite version, adding the main results of quant-ph/0511045.
7 pages and 3 figure
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Microstructure Control and Performance Evolution of Aluminum Alloy 7075 by Nano-Treating.
Nano-treating is a novel concept wherein a low percentage of nanoparticles is used for microstructural control and property tuning in metals and alloys. The nano-treating of AA7075 was investigated to control its microstructure and improve its structural stability for high performance. After treatment with TiC nanoparticles, the grains were significantly refined from coarse dendrites of hundreds of micrometers to fine equiaxial ones smaller than 20 μm. After T6 heat treatment, the grains, with an average size of 18.5 μm, remained almost unchanged, demonstrating an excellent thermal stability. It was found that besides of growth restriction factor by pinning behavior on grain boundries, TiC nanoparticles served as both an effective nucleation agent for primary grains and an effective secondary phase modifier in AA7075. Furthermore, the mechanical properties of nano-treated AA7075 were improved over those of the pure alloy. Thus, nano-treating provides a new method to enhance the performance of aluminum alloys for numerous applications
Scheme for implementing quantum information sharing via tripartite entangled state in cavity QED
We investigate economic protocol to securely distribute and reconstruct a
single-qubit quantum state between two users via a tripartite entangled state
in cavity QED. Our scheme is insensitive to both the cavity decay and the
thermal field.Comment: Final version to appear in Physica
From Jeff=1/2 insulator to p-wave superconductor in single-crystal Sr2Ir1-xRuxO4 (0 < x< 1)
Sr2IrO4 is a magnetic insulator assisted by strong spin-orbit coupling (SOC)
whereas the Sr2RuO4 is a p-wave superconductor. The contrasting ground states
have been shown to result from the critical role of the strong SOC in the
iridate. Our investigation of structural, transport, and magnetic properties
reveals that substituting 4d Ru4+ (4d4) ions for 5d Ir4+(5d5) ions in Sr2IrO4
directly adds holes to the t2g bands, reduces the SOC and thus rebalances the
competing energies in single-crystal Sr2Ir1-xRuxO4. A profound effect of Ru
doping driving a rich phase diagram is a structural phase transition from a
distorted I41/acd to a more ideal I4/mmm tetragonal structure near x=0.50 that
accompanies a phase transition from an antiferromagnetic-insulating state to a
paramagnetic-metal state. We also make a comparison drawn with Rh doped
Sr2IrO4, highlighting important similarities and differences.Comment: 18 pages,7 figure
Dichlorido(2,9-dipropÂoxy-1,10-phenanthroline-κ2 N,N′)cadmium(II)
In the title complex, [CdCl2(C18H20N2O2)], the CdII ion is coordinated by two N atoms from a bis-chelating 2,9-dipropÂoxy-1,10-phenanthroline ligand and two Cl atoms in a distorted tetraÂhedral environment. The two Cd—Cl bond distances are significantly different from each other and the N—Cd—N bond angle is acute. In the crystal structure, there are π–π stacking interÂactions between symmetry-related phenanthroline ring systems, with a centroid–centroid distance of 3.585 (3) Å
Scheme for sharing classical information via tripartite entangled states
We investigate schemes for quantum secret sharing and quantum dense coding
via tripartite entangled states. We present a scheme for sharing classical
information via entanglement swapping using two tripartite entangled GHZ
states. In order to throw light upon the security affairs of the quantum dense
coding protocol, we also suggest a secure quantum dense coding scheme via W
state in analogy with the theory of sharing information among involved users.Comment: 4 pages, no figure. A complete rewrritten vession, accepted for
publication in Chinese Physic
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