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Cryptanalysis of an Improved Flexible Ping-Pong Protocol in Perfect and Imperfect Quantum Channels
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作者 张彬彬 王大庆 +1 位作者 黄珊珊 刘玉 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第10期24-27,共4页
We recently proposed a flexible quantum secure direct communication protocol [Chin. Phys. Lett. 23 (2006) 3152]. By analyzing its security in the perfect channel from the aspect of quantum information theory, we fin... We recently proposed a flexible quantum secure direct communication protocol [Chin. Phys. Lett. 23 (2006) 3152]. By analyzing its security in the perfect channel from the aspect of quantum information theory, we find that an eavesdropper is capable of stealing all the information without being detected. Two typical attacks are presented to illustrate this point. A solution to this loophole is also suggested and we show its powerfulness against the most general individual attack in the ideal case. We also discuss the security in the imperfect case when there is noise and loss. 展开更多
关键词 Computational physics Electronics and devices quantum information and quantum mechanics
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Transformation Operator and Criterion for Perfectly Teleporting Arbitrary Three-Qubit State with Six-Qubit Channel and Bell-State Measurement 被引量:6
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作者 张子云 刘益民 +2 位作者 左学勤 章文 张战军 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第12期20-23,共4页
Using the method presented recently [Phys.Rev.A 77(2008)014306; Phys.Lett.A 369(2007)377], the transformation operator (TO) is explicitly given for teleporting an arbitrary three-qubit state with a six-qubit cha... Using the method presented recently [Phys.Rev.A 77(2008)014306; Phys.Lett.A 369(2007)377], the transformation operator (TO) is explicitly given for teleporting an arbitrary three-qubit state with a six-qubit channel and Bell-state measurements. A criterion on whether such quantum teleportation can be perfectly realized is educed in terms of TO. Moreover, six instantiations on TO and criterion are concisely shown. 展开更多
关键词 Computational physics quantum information and quantum mechanics
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Probabilistic Teleportation of Two-Particle State of General Formation in Ion Trap 被引量:1
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作者 连士曼 闫凤利 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期37-40,共4页
We propose a scheme for the probabilistic teleportation of an unknown two-particle state of general formation in ion trap. It is shown that one can realize experimentally this teleportation protocol of two-particle st... We propose a scheme for the probabilistic teleportation of an unknown two-particle state of general formation in ion trap. It is shown that one can realize experimentally this teleportation protocol of two-particle state with presently available techniques. 展开更多
关键词 Computational physics quantum information and quantum mechanics
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Scheme for Generating Cluster States with Charge Qubits in a Cavity 被引量:1
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作者 宋克慧 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第12期16-19,共4页
Based on superconducting charge qubits (SCCQs) coupled to a single-mode microwave cavity, we propose a scheme for generating charge cluster states. For all SCCQs, the controlled gate voltages are all in their degene... Based on superconducting charge qubits (SCCQs) coupled to a single-mode microwave cavity, we propose a scheme for generating charge cluster states. For all SCCQs, the controlled gate voltages are all in their degeneracy points, the quantum information is encoded in two logic states of charge basis. The generation of the multi-qubit cluster state can be achieved step by step on a pair of nearest-neighbor qubits. Considering effective long-rang coupling, we provide an efficient way to one-step generating of a highly entangled cluster state, in which the qubit-qubit coupling is mediated by the cavity mode. Our quantum operations are insensitive to the initial state of the cavity mode by removing the influence of the cavity mode via the periodical evolution of the system. Thus, our operation may be against the decoherence from the cavity. 展开更多
关键词 Superconductivity Computational physics quantum information and quantum mechanics
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Correlations Existing in Three-Qubit Product States
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作者 孙春晓 石名俊 杜江峰 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期17-20,共4页
Analytic results of the relationship between local noncommutativity and non-violations of Svetlichny inequalities for three-qubit separable states are obtained. It is shown that the converse trade-off relations presen... Analytic results of the relationship between local noncommutativity and non-violations of Svetlichny inequalities for three-qubit separable states are obtained. It is shown that the converse trade-off relations presented by Seevinck and Uffinck [Phys. Rev. A 2007 76 042105] do not always hold for three-qubit states, and that there exists some correlation even though the state is the simple product state. 展开更多
关键词 Computational physics quantum information and quantum mechanics
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Control of a Cloud of Laser-Cooled ^40Ca^+ in a Linear Ion Trap
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作者 周飞 谢艺 +3 位作者 徐酉阳 李交美 黄学人 冯芒 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期87-90,共4页
A cloud of laser-cooled ^40Ca^+ is successfully trapped and manipulated under well control in our home-built linear ion trap, which is designed and constructed solely for studying quantum information processing. By e... A cloud of laser-cooled ^40Ca^+ is successfully trapped and manipulated under well control in our home-built linear ion trap, which is designed and constructed solely for studying quantum information processing. By exploring the variation of the ion cloud with respect to the trap parameters, we have optimized the trapping condition and obtained very good fluorescence spectra. We observe the dynamics of the ion cloud, and estimate the temperature of the ion cloud to be of the order of milli-Kelvin. 展开更多
关键词 Atomic and molecular physics Computational physics quantum information and quantum mechanics
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Security Analysis of a Block Encryption Algorithm Based on Dynamic Sequences of Multiple Chaotic Systems
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作者 DU Mao-Kang HE Bo WANG Yong 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第1期39-42,共4页
Recently, the cryptosystem based on chaos has attracted much attention. Wang and Yu (Commun. Nonlin. Sci. Numer. Simulat. 14(2009)574) proposed a block encryption algorithm based on dynamic sequences of multiple c... Recently, the cryptosystem based on chaos has attracted much attention. Wang and Yu (Commun. Nonlin. Sci. Numer. Simulat. 14(2009)574) proposed a block encryption algorithm based on dynamic sequences of multiple chaotic systems. We analyze the potential flaws in the algorithm. Then, a chosen-plaintext attack is presented. Some remedial measures are suggested to avoid the flaws effectively. Furthermore, an improved encryption algorithm is proposed to resist the attacks" and to keep all the merits of the original cryptosystem. 展开更多
关键词 Computational physics quantum information and quantum mechanics Statistical physics and nonlinear systems
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