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Implementation of unambiguous comparison for unknown pure quantum states with cavity-assisted interaction

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Chinese Physics B 2013年第5期22卷 136-140页

作者：程留永王洪福张寿 yeon kyu-hwang Center for the Condensed-Matter Science and Technology Department of PhysicsHarbin Institute of Technology Department of Physics College of ScienceYanbian University BK21 Program Physics & Department of Physics College of Natural ScienceChungbuk National University

We propose two effective schemes for local and remote unknown atomic state comparisons with a cavity-assisted single photon input--output process without any initial entanglement or auxiliary resource. The unambiguous state discrim- ination is considered using the state comparison process as the basic module. All the implementation schemes here just involve common quantum logic gates and the single qubit measurement. The analysis shows that our schemes are feasible under the current experimental conditions.

关键词： unambiguous state comparison atomic qubit cavity-assisted interaction

A realizable multi-bit dense coding scheme with an Einstein-Podolsky-Rosen channel

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Chinese Physics B 2012年第10期21卷 64-69页

作者：郭奇程留永王洪福张寿 yeon kyu-hwang Department of Physics College of ScienceYanbian UniversityYanji 133002China Center for the Condensed-Matter Science and Technology Department of PhysicsHarbin Institute of TechnologyHarbin 150001China BK21 Program Physics&Department of Physics College of Natural ScienceChungbuk National UniversityCheonjuChungbuk 361-763Republic of Korea

We propose a multi-bit dense coding scheme by using only an Einstein-Podolsky-Rosen（EPR） channel and assistant *** is shown that no matter how many classical bits there are,the quantum channel is always a Bell *** present dense coding process can also prepare non-local multi-particle Greenberger-Horne-Zeilinger（GHZ） states at one of the *** quantum circuits for this dense coding process are constructed,the deterministic implementation method in an optical system based on the cross-Kerr nonlinearities is shown.

关键词： dense coding Greenberger-Horne-Zeilinger state cross-Kerr nonlinearity

Pairwise thermal entanglement in a three-qubit Heisenberg XX model with a nonuniform magnetic field and Dzyaloshinski-Moriya interaction

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Chinese Physics B 2010年第10期19卷 74-80页

作者：任金忠邵晓强张寿 yeon kyu-hwang Department of Physics College of Science Yanbian University Center for the Condensed-Matter Science and Technology Department of Physics Harbin Institute of Technology BK21 Program Physics and Department of Physics College of Natural Science Chungbuk National University

Pairwise thermal entanglement in a three-qubit Heisenberg XX model is investigated when a nonuniform mag- netic field and the Dzyaloshinski-Moriya interaction are included. We find that the nonuniform magnetic field and Dzyaloshinski-Moriya interaction are the more efficient control parameters for the increase of entanglement and critical temperature. For both the nearest neighbour sites and the next nearest neighbour sites, the magnetic field can induce entanglement to a certain extent and the Dzyaloshinski-Moriya interaction can enhance the entanglement to a stable value. The steady value of the nearest neighbour site entanglement C12 is larger than the next nearest neighbour site entanglement C13. An interesting phenomenon is that the entanglement curve of C12 appears a peak value when the Dzyaloshinski-Moriya interaction is considered in a nonuniform magnetic field.

关键词： thermal entanglement nonuniform magnetic field Dzyaloshinski-Moriya interaction,Heisenberg model

Scheme for generating a cluster-type entangled squeezed vacuum state via cavity QED

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Chinese Physics B 2014年第4期23卷 98-101页

作者：文晶姬 yeon kyu-hwang 王洪福张寿 Department of Physics College of Natural Science Chungbuk National University Department of Physics College of Science Yanbian University

A scheme is proposed to generate an N-qubit cluster-type entangled squeezed vacuum state （CTESVS） based on the two-photon interaction between a two-level atomand the cavity fields with the cavity QED system. The CTESVS in N separate cavities can be effectively obtained after performing a simple one-qubit measurement on the atom. The influence of cavity decay on the CTESVS is also discussed.

关键词： cluster state squeezed vacuum state quantum entanglement cavity QED

Quantum logic operations on two distant atoms trapped in two optical-fibre-connected cavities

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Chinese Physics B 2011年第12期20卷 88-94页

作者：张英俏张寿 yeon kyu-hwang Yu Seong-Cho Department of Physics College of ScienceYanbian University BK21 Physics Program and Department of Physics College of Natural SciencesChungbuk National UniversityCheongjuChungbuk361-763Republic of Korea

Based on the coupling of two distant three-level atoms in two separate optical cavities connected with two optical fibres, schemes on the generation of several two-qubit logic gates are discussed under the conditions of △ = δ- 2v cos πk/2 〉〉 g/2 and v-g. Discussion and analysis of the fidelity, gate time and experimental setups show that our schemes are feasible with current optical cavity, atomic trap and optical fibre techniques. Moreover, the atom-cavityfibre coupling can be used to generate an N-qubit nonlocal entanglement and transfer quantum information among N distant atoms by arranging N atom cavity assemblages in a line and connecting each two adjacent cavities with two optical fibres.

关键词： quantum logic gate cavity QED optical fibre

Quantum Systems Connected by a Time-Dependent Canonical Transformation

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Communications in Theoretical Physics 2009年第9期52卷 416-420页

作者： kyu hwang yeon Jeong Ryeol Choi ZHANG Shou BK21 Physics Program and Department of Physics College of Natural Science Chungbuk National University Cheongju Chungbuk 361-763 Korea School of Electrical Engineering and Computer Science Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 Korea Center for the Condensed-Matter Science and Technology Harbin Institute of Technology Harbin 150001 China Department of Physics College of Science Yanbinn University Yanji 133002 China

We study both classical and quantum relation between two Hamiltonian systems which are mutuallyconnected by time-dependent canonical *** is ordinary conservative system and the other is time-dependentHamiltonian *** quantum unitary operator relevant to classieai canonical transformation betweenthe two systems are obtained through rigorous *** the aid of the unitary operator,we have derivedquantum states of the time-dependent Hamiltonian system through transforming the quantum states of the *** invariant operators of the two systems are presented and the relation between them are *** that there exist numerous Hamiltonians,which gives the same classical equation of *** it isimpossible to distinguish the systems described by these Hamiltonians within the realm of classical mechanics,they canbe distinguishable quantum mechanically.

关键词：量子系统哈密顿系统时间依赖性时变保守系统哈密顿描述相互联系正则变换

Implementation of nonlocal Bell-state measurement and quantum information transfer with weak Kerr nonlinearity

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Chinese Physics B 2011年第12期20卷 72-78页

作者：白娟郭奇程留永邵晓强王洪福张寿 yeon kyu-hwang Department of Physics College of ScienceYanbian University Centre for the Condensed-Matter Science and Technology Department of PhysicsHarbin Institute of Technology BK21 Program Physics & Department of Physics College of Natural ScienceChungbuk National UniversityCheonjuChungbuk 361-763Republic of Korea

We propose a protocol to implement the nonlocal Bell-state measurement, which is nearly determinate with the help of weak cross-Kerr nonlinearities and quantum non-destructive photon number resolving detection. Based on the nonlocal Bell-state measurement, we implement the quantum information transfer from one place to another. The process is different from conventional teleportation but can be regarded as a novel form of teleportation without entangled channel and classic communication.

关键词： weak cross-Kerr nonlinearities nonlocal Bell-state measurement quantum informationtransfer

Generation of cluster-type entangled squeezed vacuum states

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Chinese Physics B 2008年第5期17卷 1618-1622页

作者：文晶姬邵晓强金星日张寿 yeon kyu-hwang Department of Physics College of Science Yanbian University Center for the Condensed-Matter Science and Technology Harbin Institute of Technology BK21 Program Physics and Department of Physics College of Natural Science Chungbuk National University

We present a scheme to prepare cluster-type entangled squeezed vacuum states （CTESVS） by considering the two-photon interaction between a two-level atom and a high-quality cavity, driven by a strong classical field. After the realization of simple atomic measurements, the generation of CTESVS in four separate cavities is accomplished within the cavity decay time. In the case of large atom=cavity detuning, the scheme is immune to the effect of atomic spontaneous emission.

关键词： cluster state squeezed vacuum state quantum entanglement

Scheme for Implementing an N-Qubit Phase Gate via Selective Atom-Field Interaction with Cavity Quantum Electrodynamics

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Chinese Physics Letters 2008年第1期25卷 27-30页

作者：邵晓强金星日朱爱东张寿 yeon kyu-hwang Department of Physics College of Science Yanbian University Yanji 133002 Center for the Condensed-Matter Science and Technology Harbin Institute of Technology Harbin 150001 BK21 Program Physics & Department of Physics College of Natural Science Chungbuk National University Cheonju Chungbuk 361-763 Republic of Korea

A scheme for implementing a two-qubit phase gate with atoms sent through a high-Q optical cavity is proposed by choosing nonidentical coupling constants between the atoms and cavity. The atomic spontaneous emission can be suppressed due to the large atom-field detuning. Moreover, the scheme can be generalized to implement an N-qubit phase gate and the gating time does not change with an increase of the number of qubits.

关键词： RESONANT INTERACTION