2-羟基-1-萘醛缩氨基脲的抗菌活性及其与牛血清白蛋白的结合作用研究

采用滤纸片法和打孔法2种抗菌试验方法,考察2-羟基-1-萘醛缩氨基脲（NAHSEM）对金黄色葡萄球菌、大肠杆菌、枯草杆菌的抗菌活性的结果表明,NAHSEM对3种细菌具有较强的抗菌活性。荧光光谱法研究了NAHSEM与牛血清白蛋白（BSA）的结合作用表明,这种结合行为使BSA的内源荧光猝灭。通过猝灭常数、结合常数和结合位点...     

Anonymous voting for multi-dimensional CV quantum system

We investigate the design of anonymous voting protocols,CV-based binary-valued ballot and CV-based multi-valued ballot with continuous variables(CV) in a multi-dimensional quantum cryptosystem to ensure the security of voting procedure and data privacy.The quantum entangled states are employed in the continuous variable quantum system to carry the voting information and assist information transmission,which takes the advantage of the GHZ-like states in terms of improving the utilization of quantum states by decreasing the number of required quantum states.It provides a potential approach to achieve the efficient quantum anonymous voting with high transmission security,especially in large-scale votes.     

Quantum Secret Sharing Based on Chinese Remainder Theorem

A novel quantum secret sharing (QSS) scheme is proposed on the basis of Chinese Remainder Theorem (CRT). In the scheme, the classical messages are mapped to secret sequences according to CRT equations, and distributed to different receivers by different dimensional superdense-coding respectively. CRT's secret sharing function,together with high-dimensional superdense-coding, provide convenience, security, and large capability quantum channel forsecret distribution and recovering. Analysis shows the security of the scheme.     

基于量子游走的仲裁量子签名方案

基于量子游走的量子隐形传输模型,提出了一种仲裁量子签名方案.发送者编码要签名的信息在硬币态上,并应用硬币态和位置态之间的条件相移算符产生用于量子隐形传输必需的纠缠态.对生成的纠缠态测量可作为签名设计和信息恢复依据.然后,接收者依据来自发送者的测量结果测量其量子态,进而验证签名的有效性和信息的真实性、完整性.由于量子游走的应用,本签名方案的初始化阶段不需要提前制备必须的纠缠态.安全性分析表明方案满足不可抵赖、不可伪造和不可否认特性,讨论和比较展示了键控链式受控非加密算法和随机数的使用可以抵抗已有方案中的抵赖和存在性伪造攻击.此外,量子游走已经被证明可以在多种不同的物理系统中和实验上实现,因此本签名方案未来也许是可实现的.     

激发态分子内质子转移分子2-羟基-1-萘甲醛半碳酰腙的光谱特性

通过考察2-羟基-1-萘甲醛半碳酰腙(HNLSC)在不同极性溶剂中的吸收光谱和荧光光谱,详细研究了HNLSC分子在不同溶剂及酸、碱条件下的不同构型,证实了HNLSC具有典型的ESIPT特性。在非极性溶剂中分子主要以分子内氢键的闭式构型存在,这种闭式构型使分子具有ESIPT特性,在环己烷溶剂和高酸度极性溶剂中分子均表现出～415nm的正常荧光和～435nm处的反常ESIPT荧光。在极性质子溶剂中,因溶质和溶剂之间形成了分子间的氢键以及进一步去质子化,HNLSC形成了基态的溶剂化开式构型和离子构型,在吸收光谱中表现出～395nm的离子构型特征吸收。开式构型和离子构型阻断了分子内质子转移途径,因而在荧光光谱中仅表现出一个特征峰。实验进一步通过三乙胺和稀硫酸调节溶液体系的极性和酸度环境,证明在不同溶剂极性和酸度环境下,HNLSC分子不仅存在萘环上羟基变化引起的多种互变异构体间的转化平衡,同时存在—CHN—NH—CO—NH2结构域的烯醇式和酮式结构的相互转化。     

Quantum dual signature scheme based on coherent states with entanglement swapping

A novel quantum dual signature scheme, which combines two signed messages expected to be sent to two diverse receivers Bob and Charlie, is designed by applying entanglement swapping with coherent states. The signatory Alice signs two different messages with unitary operations(corresponding to the secret keys) and applies entanglement swapping to generate a quantum dual signature. The dual signature is firstly sent to the verifier Bob who extracts and verifies the signature of one message and transmits the rest of the dual signature to the verifier Charlie who verifies the signature of the other message. The transmission of the dual signature is realized with quantum teleportation of coherent states. The analysis shows that the security of secret keys and the security criteria of the signature protocol can be greatly guaranteed.An extensional multi-party quantum dual signature scheme which considers the case with more than three participants is also proposed in this paper and this scheme can remain secure. The proposed schemes are completely suited for the quantum communication network including multiple participants and can be applied to the e-commerce system which requires a secure payment among the customer, business and bank.     

Arbitrated quantum signature scheme with continuous-variable squeezed vacuum states

We propose an arbitrated quantum signature(AQS) scheme with continuous variable(CV) squeezed vacuum states,which requires three parties, i.e., the signer Alice, the verifier Bob and the arbitrator Charlie trusted by Alice and Bob, and three phases consisting of the initial phase, the signature phase and the verification phase. We evaluate and compare the original state and the teleported state by using the fidelity and the beam splitter(BS) strategy. The security is ensured by the CV-based quantum key distribution(CV-QKD) and quantum teleportation of squeezed states. Security analyses show that the generated signature can be neither disavowed by the signer and the receiver nor counterfeited by anyone with the shared keys. Furthermore, the scheme can also detect other manners of potential attack although they may be successful.Also, the integrality and authenticity of the transmitted messages can be guaranteed. Compared to the signature scheme of CV-based coherent states, our scheme has better encoding efficiency and performance. It is a potential high-speed quantum signature scheme with high repetition rate and detection efficiency which can be achieved by using the standard off-the-shelf components when compared to the discrete-variable(DV) quantum signature scheme.     

Quantum Distributed Ballot Scheme Based on Greenberger-Horne-Zeilinger State

Motivated by the complementary relations of the Greenberger-Horne-Zeilinger （GHZ） entangled tripletparticle states, a novel way of realizing quantum distributed ballot scheme is proposed. The ballot information is encoded by local operations performed on the particles of entangled GHZ triplet states, which ensures the security of the present scheme. In order to guarantee the security of this scheme, the checking phase is designed in detail on the basis of the entangled GHZ triplet state. The analysis shows the security of the proposed scheme.     

具有消息链接的可转换的认证加密方案

当前多数认证加密方案存在以下问题:1)当签名者否认签名时,接收者不能向其它验证者证明签名者的诚实性;2)当消息很长时,通信代价和计算代价将会很大,为了解决这些问题,设计出一种可转换的消息链接认证加密新方案,与其它消息链接认证加密方案相比,该方案通信代价和计算复杂度都比较小,并且在该方案中,当签名者否认签名时,接收者在没有签名者合作的情况下,可单独将该认证加密签名转换为一段签名.     

2-羟基-1-萘甲醛半碳酰腙激发态分子内质子转移阴离子荧光识别

利用荧光光谱分析法,考察了2-羟基-1-萘甲醛半碳酰腙(L)作为受体分子与F~-、Cl~-、Br~-、I~-、SO_3~(2-)、NO_3~-、ClO_4~-、H_2PO_4~-、SO_4~(2-)、CH_3COO~-、CO_3~(2-)等阴离子的作用。研究结果表明,在乙腈溶液中该受体分子其酚羟基OH与—C=N—基N之间的分子内氢键强度较弱,引入CH_3COO-和CO_3~(2-)增强了分子内氢键强度,在波长495nm处出现激发态分子内质子转移(ESIPT)荧光,荧光滴定实验表明该受体分子与CH_3COO~-和CO_3~(2-)均形成1:1型结合物,提出了可能的配合物结合模式。