Key Laboratory of Optoelectronic and Telecommunication of Jiangxi

Nanchang, China

Key Laboratory of Optoelectronic and Telecommunication of Jiangxi

Nanchang, China
SEARCH FILTERS
Time filter
Source Type

Liu D.,Jiangxi Normal University | Chen Z.Q.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Wang Z.S.,Jiangxi Normal University
International Journal of Theoretical Physics | Year: 2010

The relations between geometric phases and population inversion in Rabi oscillation are investigated for all possible cases. The results show that the population inverse is an elliptically symmetric distribution as a function of the difference of geometric phases so as resiliently to rebut certain types of computational and experiment errors in geometric quantum computation. © Springer Science+Business Media, LLC 2009.


Zheng K.-M.,Jiangxi Normal University | Liu S.-Y.,Jiangxi Normal University | Zhang H.-L.,Jiangxi Normal University | Zhang H.-L.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | And 3 more authors.
Frontiers of Physics | Year: 2014

Using the technique of integration within an ordered product of operators we construct a generalized two-mode entangled state, which can be generated by an asymmetrical beam splitter (BS). Some important properties of this state, such as orthogonality and Schmidt decomposition, are also discussed by deriving the expression of BS operator in coordinate representation. As its applications, to conjugate state, obtain operator identities, generate new squeezing operators (squeezed state) are also presented. It is shown that the fidelity of quantum teleportation can be enhanced under certain case by using the asymmetrical new squeezed state as entangled resource. © 2014, Higher Education Press and Springer-Verlag Berlin Heidelberg.


Xu X.-X.,Jiangxi Normal University | Xu X.-X.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Yuan H.-C.,Changzhou Institute of Technology | Wang Y.,Jiangxi Normal University | Wang Y.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi
Chinese Physics B | Year: 2014

We investigate the nonclassical properties of arbitrary number photon annihilation-then-creation operation (AC) and creation-then-annihilation operation (CA) to the thermal state (TS), whose normalization factors are related to the polylogarithm function. Then we compare their quantum characters, such as photon number distribution, average photon number, Mandel Q-parameter, purity and the Wigner function. Because of the noncommutativity between the annihilation operator and the creation operator, the ACTS and the CATS have different nonclassical properties. It is found that nonclassical properties are exhibited more strongly after AC than after CA. In addition we also examine their non-Gaussianity. The result shows that the ACTS can present a slightly bigger non-Gaussianity than the CATS. © 2014 Chinese Physical Society and IOP Publishing Ltd.


Liu X.S.,Jiangxi Normal University | Liu X.S.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi
Advanced Materials Research | Year: 2013

A novel algorithm for face recognition is proposed. Firstly, illumination invariant feature of face image is exacted by the Nonsubsampled Contourlet Transform(NSCT) and small scale feature is exacted by the total variation model (LTV), respectively. Then the two type of features are fused into a new feature for face classification. The experimental results show that the proposed method can get very good effect in face recognition. © (2013) Trans Tech Publications, Switzerland.


Yang W.,Jiangxi Normal University | Zhang W.,Jiangxi Normal University | Tang H.,Jiangxi Journalism and Publication College | Wang Z.S.,Jiangxi Normal University | Wang Z.S.,Key Laboratory of optoelectronic and Telecommunication of Jiangxi
International Journal of Theoretical Physics | Year: 2011

Evolution of entangled degree with geometric phases and initial conditions are investigated for two-particle system in nuclear magnetic resonance under cyclic evolution. We find that a perfect entanglement may be obtained by controlling the geometric phases and initial conditions, which is helpful to implement a universal entangling geometric quantum gate in nuclear magnetic resonance. © 2010 Springer Science+Business Media, LLC.


Xu H.,Jiangxi Normal University | Ji Y.H.,Jiangxi Normal University | Ji Y.H.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Wang Z.S.,Jiangxi Normal University | Wang Z.S.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi
International Journal of Theoretical Physics | Year: 2011

Geometric phase of mixed state is expanded for a two-level atom interacting with a quantized field mode, where master equation is a modified Bloch equation with constant terms that are used to explain emergence of sidebands in the spectrum of the fluorescent light. The results show that geometric phase transition is observed for medium initial angle when the Rabi frequency associated with the driving field becomes comparable to the spectral width of the atom. We find that the geometric phase transition depends on population inversion and Bloch radius, which is helpful to understand mechanism of sideband. © 2010 Springer Science+Business Media, LLC.


Ji Y.-H.,Jiangxi Normal University | Ji Y.-H.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Liu Y.-M.,Jiangxi Normal University | Wang Z.-S.,Jiangxi Normal University | Wang Z.-S.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi
Chinese Physics B | Year: 2011

The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the initial state of the system but also on the coupling between the qubit and the environment. For the initial state (|00〉 ± |11〉)/p√2, the coupled qubits will always been in the maximum entangled state under an asymmetric coupling. For the initial state (|01〉 ± |10〉)/2, in contrast, the entangling degree of the coupled qubits is always equal to unity and does not depend on the evolving time under the symmetric coupling. We find that the stronger the interaction between the qubits is, the better the struggle against the entanglement sudden death is. © 2011 Chinese Physical Society and IOP Publishing Ltd.


Liu G.Q.,Jiangxi Normal University | Liu G.Q.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Wang Z.S.,Jiangxi Normal University | Wang Z.S.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | And 2 more authors.
Thin Solid Films | Year: 2010

A controlled evaporation self-assembly method with multiple controllable parameters was used to synthesize high-quality colloidal crystals. The environmental parameters, such as the relative humidity, evaporation temperature and pressure, were studied for the quality controls of colloidal crystals during the formation. In the experimental results, we show how these parameters influence the quality of colloidal crystals significantly. Moreover, it is found that, under the case of the relative humidity of 70%, evaporation temperature of 35 °C and pressure of 6.0 kPa, the fabricating high-quality colloidal crystals is optimal from aqueous solution of monodisperse polystyrene spheres with a diameter of 260 nm in a short time (less than 10 h). Highest possible crystal quality may be obtained after the natural drying in the vacuum chamber. © 2010 Elsevier B.V.


Li L.,Jiangxi Normal University | Li L.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Liu G.Q.,Jiangxi Normal University | Liu G.Q.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi
Optik | Year: 2013

Photonic crystal channel drop filters (CDFs) with a ring resonator have been reported and have shown good optical properties to drop the light. Photonic crystal ring resonators (PCRRs) offer scalability in size and flexibility in mode design due to their multi-mode nature [1] compared to point-defect or line-defect photonic crystal (PhC) cavities. It is far smaller in size than other corresponding devices. In this paper, we proposed several channel drop filters combination of ring resonators and point defect micro-cavities. These ring resonators work as energy couplers. They capture the electromagnetic energy propagated in the input waveguide and send it to the output waveguide at its resonant frequencies. But ring resonators have too many resonant frequencies because of their multi-mode nature. So, point defect micro-cavities are used to further filter the original light wave. In our designed CDFs, close to 100% drop efficiency has been achieved at their center normalized frequencies, respectively. © 2012 Elsevier GmbH. All rights reserved.


Li L.,Jiangxi Normal University | Li L.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | Liu G.,Jiangxi Normal University | Liu G.,Key Laboratory of Optoelectronic and Telecommunication of Jiangxi | And 2 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

A photonic crystal coupling structure is designed by introducing two parallel single-mode defect waveguides with the spacing of one row coupling rods in the two-dimensional (2D) triangular lattice array. By modulating the refractive index of some coupling rods, an optical switch based on coupled heterostructure photonic-crystal waveguides is constructed. The coupling lengths for different refractive indices of coupling rods at different frequencies are calculated to determine optimal structural parameters for the switch by the plane-wave expansion method and the principle of directional coupling. The effect of variations in the refractive index of the coupling rods and the position effect of the heterostructure coupled waveguides on the signal output channel are analyzed by using finite different time domain method. The simulation results show that it is an effective way to realize the switch function by appropriately tuning the refractive index of some coupling rods. The influence of the random distribution of the heterostructure on the switch is modest, which may contribute to the research over new kinds of optical filters, directional couplers, wavelength division multiplexers, optical switches and other photonic devices.

Loading Key Laboratory of Optoelectronic and Telecommunication of Jiangxi collaborators
Loading Key Laboratory of Optoelectronic and Telecommunication of Jiangxi collaborators