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Proposal for Direct Measurement of the Wigner Function of a Cavity Field via Raman Coupling

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Chinese Physics Letters 2000年第12期17卷 882-884页

作者： ZHENG Shi-Biao zhu xi-wen Department of Electronic Science and Applied Physics Fuzhou UniversityFuzhou 350002 Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

We propose a scheme for the reconstruction of a cavity field *** the scheme the cavity field is first displaced by a microwave source,and then couples with a three-level A-type atom in a Raman *** an appropriate interaction time the measurement of the difference between the probabilities of the atom being in two ground states directly yields the Wigner function for the field *** scheme can be easily generalized to measure the Wigner function of an entangled state of two spatially separated single-mode cavities.

关键词： state. scheme Wigner

Realization of Quantum Logic Gates in Ion Traps Without Any Requirement on the Lamb-Dicke Parameter

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Chinese Physics Letters 2000年第5期17卷 321-323页

作者： ZHENG Shi-Biao FENG Mang zhu xi-wen Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 Department of Electronic Science and Applied Physics Fuzhou UniversityFuzhou 350002

A scheme is presented for realizing quantum logic gate in an ion *** the scheme the state of the mth ion is Grst replicated onto the collective *** a transformation,conditional on the motional state,is performed on the nth *** the motional state is replicated back onto the mth *** this way the quantum logic gate between the mth and the nth ions is *** scheme does not put any requirement on the Lamb-Dicke parameter.

关键词： parameter Dicke collective

Exact Treatment for Two Ultracold Ions in a Two-Dimensional Penning Trap

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Chinese Physics Letters 1998年第4期15卷 258-259页

作者： FENG Mang FANG xi-ming SHI Lei YAN Min zhu xi-wen Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

The Schrödinger equation of two ultracold ions confined in xy plane of the Penning trap is exactly solved and the analytical form of the wave function of the system is obtained.A numerical calculation for a continued ... 详细信息

关键词： number Penning continued

Teleportation of Two Quantum States via the Quantum Computation

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Chinese Physics Letters 2000年第3期17卷 168-170页

作者： FENG Mang zhu xi-wen FANG xi-Ming YAN Min SHI Lei Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

A scheme of teleportation of two unknown quantum states via quantum computation is *** comparison with the former proposals shows that our scheme is more in tune with the original teleportation proposal and the effici... 详细信息

关键词： quantum scheme Quantum

Quantum Computation by Pairing Trapped Ultracold Ions

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Chinese Physics Letters 2001年第6期18卷 718-720页

作者： FENG Mang zhu xi-wen GAO Ke-Lin SHI Lei Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

Superpositional wave function oscillations for the implementation of quantum algorithms modify the desired interference required for the quantum computation. We propose a scheme with trapped ultracold ion-pairs being qubits to diminish the detrimental effect of the wave function oscillations, which is applied to the two-qubit Grover's search. It can be also found that the qubits in our scheme are more robust against the decoherence caused by the environment, and the model is scalable.

关键词： computation. search. quantum

Eigensolution of Schrödinger Equation for Harmonically Bound Two-Body Coulomb System

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Chinese Physics Letters 1998年第8期15卷 568-570页

作者： DUAN Yi-wu SHI Lei FENG Mang YAN Min zhu xi-wen Department of Physics Hu’nan Normal UniversityChangsha 410081 Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

Taking two identical ions in a Paul trap,we solved the SchrÖdinger equation for one-,two-,and three-dimensional harmonically bound two-body Coulomb models,in which the eigenfunctions are written in a series form and the eigenenergies are obtained from a continued *** calculations are made for specific discussion of two-and three-dimensional *** comparison with a former one-dimensional approximate work shows that our result is more general and accurate.

关键词： continued Harmonic identical

Effect of the Double Frequency of Trap Field in a Paul Trap

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Communications in Theoretical Physics 2001年第11期36卷 593-596页

作者： NIE Zong-xiu FENG Mang LI Jiao-Mei SHI Lei zhu xi-wen GAO Ke-Lin State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsThe Chinese Academy of SciencesWuhan 430071China

The effect of double frequency oftrap fieldφ=U-V1 cosΩt-V2 cos 2Ωt in a Paul trap can be described exactly by using a function series expansion to solve the corresponding Mathieu *** stability regions of a trapped ... 详细信息

关键词： double frequency trap field Paul trap

Observation of Hysteresis of the Ion Cloud Motion in an rf Trap

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Chinese Physics Letters 1997年第8期14卷 581-584页

作者： GAO Ke-lin LUO Xue-li zhu xi-wen YAN Min LI Jiao-mei Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of PhysicsChinese Academy of SciencesWuhan 430071

Variations of the hysteresis of the rf detection signals corresponding to the axial motion of an ion cloud in a Paul trap versus the detection voltage,operation parameters and number of ions have been *** features are explained by an extended pseudopotential model with an octupole potential correction and an effective potential from the ion cloud.

关键词： correction hysteresis Hyster

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量子逻辑网络的核磁共振实现

原子与分子物理学报 2001年第2期18卷 173-177,181页

作者：方细明朱熙文 zhu xi-wen DUAN Yi-wu 湖南师范大学物理系湖南长沙410081 中国科学院武汉物理与数学研究所 State Key Laboratory of Magnetic Resonance and Atomic and Mo1ecu1ar Physics Wuhan Institute of Physics and Mathematics Chinese Acadetny of Sciences Department of Physics Hunan Normal University

利用相位相反技术 ,设计出了实现精确的CN门的脉冲序列 ;构造了三量子位的双重控制相位旋转门(CCS门 ) ,它是将核磁共振 (NMR)实现Grover量子算法从二量子位推广到三量子位的关键逻辑门 ,而且 ,依此方法 ,可以用NMR实现N量子位的Grover... 详细信息

利用相位相反技术 ,设计出了实现精确的CN门的脉冲序列 ;构造了三量子位的双重控制相位旋转门(CCS门 ) ,它是将核磁共振 (NMR)实现Grover量子算法从二量子位推广到三量子位的关键逻辑门 ,而且 ,依此方法 ,可以用NMR实现N量子位的Grover量子算法 ;还给出了量子Toffoli门以及量子态的各种对称操作的逻辑部件。所有这些逻辑操作都是构建量子态工程的工具。文中大部分脉冲序列己经在实验中得到验证 ,这些结果对于量子计算的理论研究和实验实现都具有现实意义。

关键词：量子计算核磁共振量子逻辑门 Grover量子算法对称操作量子逻辑网络相位相反技术脉冲序列