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Telecloning Quantum States with Trapped Ions

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Communications in Theoretical physics 2007年第5X期48卷 827-830页

作者： yang rong-can li hong-cai lin xiu huang zhi-ping school of physics and optoelectronics technology Fujian Normal University Fuzhou 350007 China

We propose a scheme for telecloning quantum states with trapped ions. The scheme is based on a single ion interacting with a single laser pulse. In the protocol, an ion is firstly measured to determine whether the telecloning succeeds or not, and then another ion is detected to complete the whole procedure. The required experimental techniques are within the scope of what can be obtained in the ion-trap setup.

关键词： telecloning W states state-dependent trapped ions

Faithful Teleportation of an Unknown Atomic-Entangled State Without Bell-State Measurement

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Communications in Theoretical physics 2008年第3期49卷 621-624页

作者： lin xiu li hong-cai yang rong-can huang zhi-ping school of physics and optoelectronics technology Fujian Normal University Fuzhou 350007 China

An alternative scheme is proposed for teleportation of an unknown atomic-entangled state. The scheme is based on the resonant interaction of a two-mode cavity field with a A-type three-level atom. In contrast with the previously proposed scheme of [Commun. Theor. Phys. 47 （2007） 253], the present scheme is ascendant, since the fidelity is 1.0 in principle similarly without the Bell-state measurement. The scheme may be generalized to not only the teleportation of the cavity-mode-entangled-state but also the teleportation of the multi-atomic entangled states included in generalized GHZ states. And the scheme is experimentally feasible based on the current cavity QED technique.

关键词： teleportation A-type atom two-mode cavity field Bell-state measurement

Simple Scheme for Directly Measuring Concurrence of Two-Qubit Pure States in One Step

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Communications in Theoretical physics 2009年第2期51卷 252-254页

作者： yang rong-can lin xiu huang zhi-ping li hong-cai school of physics and Opto-Electronics technology Fujian Normal University Fuzhou 350007 China

In the present work, a simple scheme for the direct measurement of the concurrence of two-qubit pure states is proposed. The scheme is based on trapped ions and only needs one step when the two identical pure states are given. The vibrational mode in our proposal is only virtually excited, which is important in view of ***, the scheme is feasible based on current technologies.

关键词： concurrence trapped ions measurement one step

Implementing a Universal Quantum Cloning Machine via Adiabatic Evolution in Ion-Trap System

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Communications in Theoretical physics 2008年第1期49卷 80-82页

作者： yang rong-can li hong-cai lin xiu huang zhi-ping XIE hong school of physics and Opto-Electronics technology Fujian Normal University Fuzhou 350007 China

A scheme for the realization of a universal quantum cloning machine is proposed in this paper. The present protocol does not need the vibrational mode to act as the memory and it is robust against small changes of experimental parameters due to adiabatic passages. Furthermore, the scheme may be realized based on current technology.

关键词： universal quantum cloning adiabatic evolution dark state trapped ions

Scheme for Implementation of Ancillary-Free 1→3 Optimal Phase-Covariant Quantum Cloning with Trapped Ions

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Communications in Theoretical physics 2008年第6期49卷 1499-1501页

作者： yang rong-can li hong-cai lin xiu huang zhi-ping XIE hong school of physics and Opto-Electronics technology Fujian Normal University Fuzhou 350007 China

We propose a simple scheme for the implementation of the ancillary-free 1→3 optimal phase-covariant quantum cloning for x-y equatorial qubits in ion-trap system. In the scheme, the vibrational mode is only virtually excited, which is very important in view of decoherence. The present proposal can be realized based on current available technologies.

关键词： ancillary-free phase-covariant quantum cloning trapped ions

A Scheme for Generating Cluster States via Raman Interaction

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Communications in Theoretical physics 2007年第1期47卷 53-58页

作者： yang rong-can li hong-cai lin xiu huang zhi-ping CHEN Mei-Xiang school of physics and optoelectronics technology Fujian Normal University Fuzhou 350007 China

A scheme for generating cluster states via Raman interaction is proposed. In the scheme, we firstly prepare cluster states of multi-cavities with information encoded in the coherent states and then generate cluster states of multiatoms, which encode the information in the ground states of A-type atoms. The advantages of our scheme are that the atomic spontaneous radiation can be efficiently reduced since the cavity frequency is largely detuned from the atomic transition frequency and the Hadamard gate operation of the coherent states is replaced by measuring the coherent states.

关键词： cluster states Raman interaction A-type three-level atom coherent states

Transferring a Multi-atom Entangled State via Adiabatic Passage

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Communications in Theoretical physics 2007年第5期47卷 816-820页

作者： lin xiu CHEN Mei-Ying lin xiu-Min li hong-cai yang rong-can school of physics and optoelectronics technology Fujian Normal University Fuzhou 350007 China

We present a scheme for transferring atomic entangled states via adiabatic passage. In the scheme, we use photons to achieve efficient quantum transmission among spatially distant atoms. The probability of the successful transferring quantum state approaches 1. Meanwhile, the scheme is robust against the effects of atomic spontaneous emission.

关键词： quantum state transfer atomic entangled state cavity QED

Generation of Four-atom Cluster States in Thermal Cavity and Implementing Remote Controlled Not Gate

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Generation of Four-atom Cluster States in Thermal Cavity and...

Probabilistic Teleportation of a Three-Particle GHZ State via Two Three-Particle Entangled W States

第十二届全国量子光学学术会议

作者： rong-can yang, hong-cai li, Mei-xiang Chen, xiu lin (school of physics and optoelectronics technology, fujian normal university, fuzhou 350007, china)

＜正＞We propose a scheme of preparing four-atom cluster states in thermal cavity. Four two-level atoms, three thermal cavities and classical field are used in the scheme. Compared with previous schemes, the scheme can be generalized to n-atom cluster states and the successful probability can be 100% , which the system of the photon can

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来源： cnki会议评论

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Communications in Theoretical physics 2006年第6期45卷 1018-1022页

作者： lin xiu li hong-cai school of physics and optoelectronics technology Fujian Normal University Fuzhou 350007 China

A scheme for teleporting an unknown three-particle GHZ state from a sender to either one of two receivers is proposed. In this scheme, the quantum channel is composed of two non-maximally three-particle entangled W states. An unknown three-particle GHZ state can be perfectly teleported probabilistically if the sender performs two generalized Bell-state measurements and the Hadamard operation while either one of two receivers introduces an ancillary particle which is one of the final three particle constituting the teleported state, then performs the controlled-not operation with the ancillary particle as the target bit and introduces an appropriate unitary transformation with the help of the other receiver＇s simple measurements. All kinds of unitary transformations are given in detail. The present scheme may be directly generalized to teleport an unknown multiparticle GHZ state via two three-particle entangled W states used as the quantum channel.

关键词： probabilistic teleportation three-particle entangled state partially three-particle entangled W state unitary transformation