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Search Results: 1 - 10 of 3363 matches for " Kyu-Hwang "
All listed articles are free for downloading (OA Articles)
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Quantum logic operations on two distant atoms trapped in two optical-fibre-connected cavities

Zhang Ying-Qiao,Zhang Shou,Yeon Kyu-Hwang,Yu Seong-Cho,

中国物理 B , 2011,
Abstract:
Pairwise thermal entanglement in a three-qubit Heisenberg XX model with a nonuniform magnetic field and Dzyaloshinski-- Moriya interaction

Ren Jin-Zhong,Shao Xiao-Qiang,Zhang Shou,Yeon Kyu-Hwang,

中国物理 B , 2010,
Abstract: Pairwise thermal entanglement in a three-qubit Heisenberg XX model is investigated when a nonuniform magnetic 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.
Implementation of positive-operator-value measurements for single spin qubit via Heisenberg model

Cheng Liu-Yong,Shao Xiao-Qiang,Zhang Shou,Yeon Kyu-Hwang,

中国物理 B , 2010,
Abstract: This paper shows that a proposal for implementing all possible two-operator positive-operator-value measurements of single spin qubit can be obtained via introducing another spin qubit as ancilla. The realization process is accomplished from the free evolution of the Heisenberg XX model by considering nearest-neighbour spin interaction. A controlled-NOT gate, which is a significant operator for this scheme is also constructed and the generalisation to multiple-operator is considered finally.
Multi-Receiver Quantum Dense Coding with Non-Symmetric Quantum Channel
Chang-Bao Fu,Shou Zhang,Ke Li,Kyu-Hwang Yeon,Chung-In Um
Physics , 2006, DOI: 10.1088/1009-1963/15/8/007
Abstract: A two-receiver quantum dense coding scheme and an $N$-receiver quantum dense coding scheme, in the case of non-symmetric Hilbert spaces of the particles of the quantum channel, are investigated in this paper. A sender can send his messages to many receivers simultaneously. The scheme can be applied to quantum secret sharing and controlled quantum dense coding.
Entangled States Generated via Two Superconducting Quantum Interference Devices(SQUIDs) in cavity QED
Yan Li,Shou Zhang,Kyu-Hwang Yeon,Chung-In Um
Physics , 2006,
Abstract: We propose a scheme for generating entangled states for two superconducting quantum interference devices in a thermal cavity with the assistance of a microwave pulse.
Efficient Scheme for Implementing a Fredkin Gate via Resonant Interaction with Two-Mode Cavity Quantum Electrodynamics
fficient Scheme for Implementing a Fredkin Gate via Resonant Interaction with Two-Mode Cavity Quantum Electrodynamics

SHAO Xiao-Qiang,WEN Jing-Ji,JIN Xing-Ri,ZHU Ai-Dong,ZHANG Shou,YEON Kyu-Hwang,
邵晓强
,文晶姬,金星日,朱爱东,张寿,YEON,Kyu-Hwang

中国物理快报 , 2007,
Abstract: A scheme for implementing a Fredkin gate with an atom sent through a microwave cavity is proposed. The scheme is based on the resonant atom-cavity interaction so that the gating time is sharply short, which is important in view of decoherence.
Generation of cluster-type entangled squeezed vacuum states

Wen Jing-Ji,Shao Xiao-Qiang,Jin Xing-Ri,Zhang Shou,Yeon Kyu-Hwang,

中国物理 B , 2008,
Abstract: 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.
Controlled Quantum Dense Coding in a Four-particle Non-maximally Entangled State via Local Measurements
Chang-Bao Fu,Yan Xia,Bo-Xue Liu,Shou Zhang,Kyu-Hwang Yeon,Chung-In Um
Physics , 2006,
Abstract: A controlled quantum dense coding scheme is investigated with a four-particle non-maximal quantum channel. The amount of classical information is shown to be capable of being controlled by the controllers through adjustments of the local measurement angles and to depend on the coefficients of the quantum channel; in addition, the four particles are distributed in two inverse ways in such an quantum channel. A restricted condition for distributing the particles to realize quantum dense coding in an arbitrary ($N+2$)-particle quantum channel is proposed.
Quantum Dialogue by Using the GHZ State
Yan Xia,Chang-Bao Fu,Shou Zhang,Suc-Kyoung Hong,Kyu-Hwang Yeon,Chung-In Um
Physics , 2006,
Abstract: We present a quantum dialogue protocol by using the Greenberger-Horne-Zeilinger (GHZ) state. In this paper, we point out that the `quantum dialogue' communication scheme recently introduced by Nguyen can be eavesdropped on under an intercept-and-resend attack. We also give a revised control mode to detect this attack. Hence, within the present version two users can exchange their secret messages securely and simultaneously, and the efficiency of information transmission can be successfully increased.
Controlled Secure Direct Communication by Using GHZ Entangled State
Yan Xia,Chang-Bao Fu,Feng-Yue Li,Shou Zhang,Kyu-Hwang Yeon,Chung-In Um
Physics , 2006,
Abstract: We present a controlled secure direct communication protocol by using Greenberger-Horne-Zeilinger (GHZ) entangled state via swapping quantum entanglement and local unitary operations. Since messages transferred only by using local operations and a public channel after entangled states are successfully distributed, this protocol can protect the communication against a destroying-travel-qubit-type attack. This scheme can also be generalized to a multi-party control system.
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