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Generation of Superpositions of Coherent Interaction States Along a Straight Line via Raman Interaction

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Communications in Theoretical Physics 2005年第6X期44卷 1073-1075页

作者： yang zhen-biao Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

We present an alternative scheme for preparing the superpositions of coherent states along a straight line of a cavity field using degenerate atom-cavity field Raman interaction. In the scheme, a collection of A-type three-level atoms is orderly sent through the cavity to interact with the cavity field adjusted by a microwave source connected to it, followed by state-selective measurements. In this way, we can prepare the superpositions of several coherent states along a straight line with arbitrary weighting factors for the cavity field. In the scheme, the coherence of the atom-cavity system may be maintained and the second microwave field is unnecessary, which is prior to the previous scheme.

关键词： coherent states superpositions straight line Raman interaction

Alternative Scheme for Teleportation of Two-Atom Entangled State in Cavity QED

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Communications in Theoretical Physics 2006年第4X期46卷 623-626页

作者： yang zhen-biao Department of Electronic Science and Applied Physics Fuzhou University Fhzhou 350002 China

We have proposed an alternative scheme for teleportation of two-atom entangled state in cavity QED. It is based on the degenerate Raman interaction of a single-mode cavity field with a A-type three-level atom. The prominent feature of the scheme is that only one cavity is required, which is prior to the previous one. Moreover, the atoms need to be detected are reduced compared with the previous scheme. The experimental feasibility of the scheme is discussed. The scheme can easily be generalized for teleportation of N-atom GHZ entangled states. The number of the atoms needed to be detected does not increase as the number of the atoms in GHZ state increases.

关键词： teleportation two-atom entangled state cavity QED

Strong-Driving-Assisted Probabilistic State Preparation in Cavity QED

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Communications in Theoretical Physics 2006年第5X期46卷 919-922页

作者： yang zhen-biao Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

An alternative scheme is proposed for preparing the superpositions of coherent states with controllable weighting factors along a straight line for a cavity field. The scheme is based on the interaction of a single-mode cavity field with a resonant two-level atom driven by a strong classical field. It is in contrast to the previous methods used in cavity QED of injecting a coherent state into a cavity via a microwave source. In the scheme, the interaction between the cavity mode and atoms is fully resonant, thus the required interaction time is greatly shortened. Moreover, the present scheme requires smaller numbers of operations. In view of decoherence, a reduction of interaction time and numbers of operations for the state preparation is very important for experimental implementation of quantum state engineering.

关键词： strongly driven atoms probabilistic state preparation cavity QED

An Alternative Scheme for Transferring Quantum States and Preparing a Quantum Network in Cavity QED

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Communications in Theoretical Physics 2007年第6期47卷 1037-1040页

作者： yang zhen-biao SU Wan-Jun Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

An alternative scheme is proposed to transfer quantum states and prepare a quantum network in cavity QED. It is based on the interaction of a two-mode cavity field with a three-level V-type atom. In the scheme, the atom-cavity field interaction is resonant, thus the time required to complete the quantum state transfer process is greatly shortened, which is very important in view of decoherence. Moreover, the present scheme does not require one mode of the cavities to be initially prepared in one-photon state, thus it is more experimentally feasible than the previous ones.

关键词： quantum states transfer quantum network cavity QED

Quantum Teleportation and Superdense Coding via W-Class States

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Communications in Theoretical Physics 2008年第4期49卷 901-904页

作者： WU Huai-Zhi yang zhen-biao zhenG Shi-biao Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

Abstract According to the protocol of Agrawal et al., we propose a cavity QED scheme for realization of teleportation and dense coding. Instead of using EPR states and GHZ states, our scheme is more insensitive to the loss of one particle by using a W-class state as a quantum channel. Besides, our scheme is immune to thermal field, and does not require the cavity to remain in the vacuum state throughout the procedure.

关键词： W-class states teleportation dense coding

Robust Generation of Qutrit-Qutrit Entanglement through a Single Resonant Interaction Assisted by Moderate Driving

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Chinese Physics Letters 2013年第12期30卷 49-53页

作者： WU Huai-Zhi yang zhen-biao Lab of Quantum Optics Department of PhysicsFuzhou UniversityFuzhou 350002

We propose to engineer qutrit-qutrit entanglement through resonant atom-cavity interaction assisted by moderate laser driving,study two parameter regimes,respectively,of asymmetric atom-laser coupling and of asymmetric atom-cavity coupling,and find that both the coupling regimes possess the advantage of short operation time,compared with the previous ones achieved by dispersive interaction,adiabatic passage,and even quantum Zeno *** check numerically the influences of the parameter fluctuations and dissipation on the scheme and show it to be *** scheme can also be generalized to other physical systems such as the ion trap.

关键词： dynamics coupling scheme

Scheme for Preparation of Macroscopic Multi-component Entanglement in Cavity QED

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Communications in Theoretical Physics 2008年第2期49卷 473-476页

作者： JIA Lian-Jun yang zhen-biao ZHOU zhen-Xiao Department of Physics Lanzhou University Lanzhou 730000 China Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China

We propose a scheme of generating multi-component entangled coherent states of cavity fields. In this scheme, the atoms pass through cavities one by one, simultaneously driven by a strong classical field in each cavity. Then the detection of the atomic states collapses the cavity fields onto multi-component entangled coherent states. It is shown that, with a judicious choice of the parameters of the classical field, we can conditionally produce macroscopic multi-dimensional maximal entanglement for the cavity modes.

关键词： resonant interaction strongly driven atom multi-component entanglement cavity QED

Generation of Vibrational Entangled Coherent States of Two Trapped Ions

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Communications in Theoretical Physics 2005年第4X期44卷 712-714页

作者： LIN Li-Hua JIANG Yun-Kun yang zhen-biao YE Sai-Yun Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

We propose a scheme for the generation of entangled coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are simultaneously illuminated by a single standing-wave laser tuned to the carrier. The scheme allows the production of an entangled coherent states with a considerably high speed as long as a laser field of sufficiently high intensity is available.

关键词： entangled coherent state vibrational mode trapped ion

Quantum nonlocality evolution for two entangled mesoscopic fields under decoherence

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Communications in Theoretical Physics 2024年第1期76卷 24-28页

作者： Zhao-Song Tan Shou-Bang yang zhen-biao yang Shi-biao zheng Fujian Key Laboratory of Quantum Information and Quantum Optics Fuzhou UniversityFuzhouFujian 350116China

Investigation of the nonlocality evolution of entangled mesoscopic fields under decoherence not only is important for understanding the quantum–classical transition,but also has relevance to quantum communication and quantum computation protocols based on continuous *** to previous formulations of Bell inequalities,the system loses nonlocal features far before the disappearance of *** here construct a new version of Bell signal based on rotated and displaced on–off correlations,with which the Bell inequality is violated as long as there remains entanglement and the field state components keep ***,the nonlocal character revealed by our formulation decays much slower compared with those based on previous *** importantly,there exists a wide regime where the Bell inequality is restored with previous formulations but remains to be violated based on our correlation operators.

关键词： entangled mesoscopic fields rotated and displaced on-off correlations Bell inequality nonlocality evolution