Publications (15)25 Total impact
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ABSTRACT: A robust scheme for unknown entangled state transfer and CNot gate implemented between two spatially separated atoms is proposed. It is shown that, in the effective threeatom Ising model, twoatom unknown entangled state can be transferred from one pair of atoms to another deterministically by only repeating a simple operation of turning on/off local laser field applied on atom for two times at controlling time $\frac{\pi}{2\Omega_{0}}$. The whole time cost is less than $\frac{3\pi}{2\Omega_{0}}$. The successful probability and the fidelity are almost 100% for small atomic spontaneous emission rate. Deterministic twoatom CNot gate can also be implemented in this model by just turning on/off the local laser field applied on the single target atom and leaving the controlling atom in its cavity alone for a while. The whole time cost is less than $\frac{\pi}{2\Omega_{0}}+\frac{3\pi \Delta}{2g^{2}}$. It is demonstrated that the scheme is insensitive to cavity leakage and fiber loss.  [Show abstract] [Hide abstract]
ABSTRACT: A robust quantum state transfer scheme is discussed for three atoms that are trapped by separated cavities linked via optical fibers in ringconnection. It is shown that, under the effective threeatom Ising model, arbitrary quantum state can be transferred from one atom to another deterministically via an auxiliary atom with maximum unit fidelity. The only required operation for this scheme is replicating turning on/off the local laser fields applied to the atoms for two steps with time cost $\frac{\sqrt{2}\pi}{\Gamma_{0}}$. The scheme is insensitive to cavity leakage and atomic position due to the condition $\Delta \approx \kappa\gg g$. Another advantage of this scheme is that the cooperative influence of spontaneous emission and operating time error can reduce the time cost for maximum fidelity and thus speed up the implementation of quantum state transfer.Chinese Physics Letters 03/2015; 32(6). DOI:10.1088/0256307X/32/6/060303 · 0.95 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The key mechanism which enables twoqubit operations of a hybrid quantum processing unit for hybrid quantum computing is demonstrated. A scheme which realizes a disguised switch for twoqubit gating is proposed, combining external magnetic field control, quantum dot sample tuning, and assisted laser control. Our methods overcome the limitation of asynchrony between singlequbit operations of respective solidstate qubits and improve the efficiency of singlequbit gating.International Journal of Theoretical Physics 02/2014; 54(2):657663. DOI:10.1007/s1077301422578 · 1.18 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We propose two schemes to onestep generate the threeparticle Greenberger–Horne–Zeilinger state based on the resonant atom–cavity fields interaction. The whole process may be realized experimentally providing that simple apparatus, initial conditions, and some manipulation in principle are achieved. Finally, in the current or the near future experiment parameter, we show that the proposed schemes can maintain the state with high fidelity under the condition of atomic spontaneous emission and decay of cavity fields.Journal of the Optical Society of America B 07/2012; 29(77):17441749. DOI:10.1364/JOSAB.29.001744 · 1.97 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We construct a novel Λtype system via the dressed states formed by the coupling between a superconducting qubit and a transmission line resonator (TLR). Compared with the conventional threelevel structure, our model averts the decay of excited states. We choose the two lowest energy dressed states as the logical states. The single qubit quantum gate can be realized by the adiabatic passage and threestep operation method, respectively. Based on realistic parameters, the feasibility of the adiabatic passage method is discussed. Also, we calculate the fidelity (0.9996) of realizing the single qubit gate with the threestep operation method.Chinese Physics Letters 12/2011; 28(12). DOI:10.1088/0256307X/28/12/120304 · 0.95 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We discuss the creation of quantum discord between two twolevel atoms trapped in an optical cavity in a noisy environment. It is shown that nonzero steadystate quantum discord between atoms can be obtained when the whitenoise field is separately imposed on atoms or cavity mode, while the steadystate quantum discord reaches zero if both cavity mode and atoms are driven simultaneously by whitenoise fields. In particular, we demonstrate that whitenoise field in different cases can play a variously constructive role in the generation of quantum discord.Journal of the Optical Society of America B 11/2011; 27(9). DOI:10.1364/JOSAB.27.001799 · 1.97 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We propose a theoretical scheme of quantum nondemolition measurement of twoqubit Werner state. We discuss our scheme with the two qubits restricted in a local place and then extend the scheme to the case in which two qubits are separated. We also consider the experimental realization of our scheme based on cavity quantum electrodynamics. It is very interesting that our scheme is robust against the dissipative effects introduced by the probe process. We also give a brief interpretation of our scheme finally.Physical Review A 10/2011; 82(4). DOI:10.1103/PhysRevA.82.04211 · 2.81 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We develop an architecture of hybrid quantum solidstate processing unit for universal quantum computing. The architecture allows distant and nonidentical solidstate qubits in distinct physical systems to interact and work collaboratively. All the quantum computing procedures are controlled by optical methods using classical fields and cavity QED. Our methods have prominent advantage of the insensitivity to dissipation process benefiting from the virtual excitation of subsystems. Moreover, the QND measurements and state transfer for the solidstate qubits are proposed. The architecture opens promising perspectives for implementing scalable quantum computation in a broader sense that different solidstate systems can merge and be integrated into one quantum processor afterwards.Physical Review A 06/2011; 84(4). DOI:10.1103/PhysRevA.84.042339 · 2.81 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We reexamine quantum correlation from the fundamental perspective of its consanguineous quantum property, the coherence. We emphasize the importance of specifying the tensor product structure of the total state space before discussing quantum correlation. A measure of quantum correlation for arbitrary dimension bipartite states using nonlocal coherence is proposed, and it can be easily generalized to the multipartite case. The quantification of nonentangled component within quantum correlation is investigated for certain states.International Journal of Theoretical Physics 11/2010; 51(11). DOI:10.1007/s1077301212156 · 1.18 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We propose a new controllable protocol for information transmission which is based on coupling superconducting charge qubits to a singlemode quantum transmission line. We show how to physically implement highfidelity information transmission by controlling the external magnetic flux in this system. By choosing appropriate parameters, the cluster states can be generated. Finally, we investigate the feasibility of this protocol with presentday technology.Physica Scripta 11/2010; 82(6):065010. DOI:10.1088/00318949/82/06/065010 · 1.13 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We study the dynamics of quantum coherence and quantum correlations in two semiconductor doubledot molecules separated by a distance and indirectly coupled via a transmission line resonator. Dominant dissipation processes are considered. The numerical results show the sudden death of entanglement and the robustness of quantum discord to sudden death. Furthermore, the results indicate the dephasing processes in our model can lead in the revival and decay of coherence and discord with the absence of entanglement for certain initial states. By observing the dynamics of coherence versus discord for different initial states, we find that the similarities and differences of coherence and discord are not only related to the dependance of discord on optimizing the measurement set, but more importantly to the coherences in individual qubits which are captured by the adopted coherence measure.Journal of Physics B Atomic Molecular and Optical Physics 11/2010; 44(3). DOI:10.1088/09534075/44/3/035501 · 1.98 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We propose a scheme to efficiently produce large cluster states by using many superconducting Josephson junction flux qubits coupling to the quantized nanomechanical resonator (NAMR). This coupling is independently controlled by an external coupling magnetic field. Through controlling the parameter of system, the cluster states are generated by this scheme. Also, our approach is convenient for implementing one way quantum computing.Physica B Condensed Matter 08/2010; 405(16):3334–3336. DOI:10.1016/j.physb.2010.04.075 · 1.32 Impact Factor 
Article: Positive effect of scattering strength of a microtoroidal cavity on atomic entanglement evolution
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ABSTRACT: We show that the rough surface of a microtoroidal cavity (scattering strength) can play a constructive role by studying the entanglement of two atoms surrounding the cavity. Analytical results show that appropriate surface roughness can enhance the atomic entanglement. In particular, the rough surface can also compensate for the loss of maximal entanglement during the evolution caused by cavity leakage and atomic spontaneous emission.Physical Review A 04/2010; 81(4). DOI:10.1103/PHYSREVA.81.042309 · 2.81 Impact Factor 
Article: Nonadiabatic geometric rotation of electron spin in a quantum dot by 2Pi hyperbolic secant pulses
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ABSTRACT: In this paper, the geometric and dynamic phase components of overall phase induced by 2{\pi} hyperbolic secant pulses in a quantum dot is analyzed. The dependence of two phase components on the ratio of the Rabi frequency to the detuning is investigated. Numerical results indicate that only for one resonant pulse the induced overall phase is purely the geometric phase. With other values of the ratio the overall phase consists of a nonzero dynamic part. The effect of spin precession to decrease the dynamic phase is characterized and discussed by analytical and numerical techniques. Utilizing the symmetry relations of the phases, a scheme to eliminate the dynamic phase by multipulse control is proposed. By choosing the proper parameter for each pulse, the dynamic phases induced by different pulses cancel out. The total pure geometric phase varies from {\pi} to {\pi}, which realizes the arbitrary geometric rotation of spin. Average fidelity is calculated and the effects of magnetic field and decay of the trion state are compared and discussed. The results show the crucial role of weak magnetic field for high fidelity (above 99.3%). Comment: 7 pages, 8 figures, 1 tableJournal of Physics B Atomic Molecular and Optical Physics 04/2010; 43(12). DOI:10.1088/09534075/43/12/125504 · 1.98 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We propose a deterministic teleportation protocol of electrons in an array of three quantumdot molecules. The qubit operations are implemented by sequences of stimulated Raman adiabatic passage (STIRAP) pulses. We show the significant efficiency of the protocol: only one cNOT gate plus one Hadamard gate is required for the basis transformation, and one singlespin rotation for the reconstruction procedure. Picosecondscale pulses allow for ultrashort total duration of the protocol, which is far less than the lifetime of electron spin. After only ~5% of the spindecoherence time the teleportation process can be completed, which implies a high teleportation fidelity.Journal of Physics B Atomic Molecular and Optical Physics 09/2009; 42(19):195508. DOI:10.1088/09534075/42/19/195508 · 1.98 Impact Factor
Publication Stats
60  Citations  
25.00  Total Impact Points  
Top Journals
Institutions

20142015

Dalian Maritime University
 Department of Physics
Lütashih, Liaoning, China


20092011

Dalian University of Technology
 School of Physics and Optoelectronic Technology
Lütashih, Liaoning, China
