Deterministic Secure Quantum Communication with Cluster State and Bell-Basis Measurements

We present a novel protocol for deterministic secure quantum communication by using the four-qubit clusterstate as quantum channel.It is shown that two legitimate users can directly transmit the secret messages based on Bell-basis measurements and classical communication.The present protocol makes use of the ideas of block transmission anddecoy particle checking technique.It has a high capacity as each cluster state can carry two bits of information,and hasa high intrinsic efficiency because almost all the instances except the decoy checking particles (its number is negligible)are useful.Furthermore,this protocol is feasible with present-day technique.

Multiparty-Controlled Remote Preparation of Two-Particle State

We propose a scheme for multiparty-controlled remote preparation of the two-particle state by usingtwo non-maximally Greenberger-Horne-Zeilinger states as quantum channel.Our scheme consists of one sender andn remote receivers.It will be shown that the sender can help either one of the n receivers to remotely preparationthe original state with the appropriate probability,and the sender Alice's two-particle projective measurement and thecontrollers' single-particle product measurements are needed.We also obtained the probability of the successful remotestate preparation.

Robust Quantum Secure Direct Communication and Deterministic Secure Quantum Communication over Collective Dephasing Noisy Channel

We propose two schemes for quantum secure direct communication (QSDC) and deterministic securequantum communication (DSQC) over collective dephasing noisy channel.In our schemes,four special two-qubit statesare used as the quantum channel.Since these states are unchanged through the collective dephasing noisy channel,the effect of the channel noise can be perfectly overcome.Simultaneously,the security against some usual attacks canbe ensured by utilizing the various checking procedures.Furthermore,these two schemes are feasible with present-daytechnique.

Three-Party Quantum State Sharing of an Arbitrary Unknown Two-Qubit State Based on Entanglement Swapping and Bell-State Measurements

We propose a scheme for sharing an arbitrary unknown two-qubit state among three parties by using afour-qubit cluster-class state and a Bell state as a quantum channel With a quantum controlled phase gate (QCPG)operation and a local unitary operation,any one of the two agents has the access to reconstruct the original state ifhe/she collaborates with the other one,whilst individual agent obtains no information.As all quantum resource canbe used to carry the useful information,the intrinsic efficiency of qubits approaches the maximal value.Moreover,thepresent scheme is more feasible with present-day technique.

Teleportation of an Arbitrary Two-Atom Entangled State via Thermal Cavity

我们在场为由使用二原子的贝尔的一个任意的未知二原子的纠缠的状态的远距传物的一个试验性地可行的计划在驾驶的热洞说。在这个计划，热地和洞腐烂的效果都能被消除。而且，现在的计划根据当前的技术是可行的。

Sign Flip in Giorgi-Pasquale-Paganelli Model

象 theGiorgi-Pasquale-Paganelli (GPP ) 一样利用我们的改进的门非破坏性的门[Phys。加快。一 70 (2004 ) 022319 ] ，在 GPP 模型的起始的状态的任何术语的符号能被撕破。符号的成功可能性术语的奇数扭动是概率的(1/4 ) ，当时符号的成功可能性术语的偶数扭动是确定的(1 ) 。