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The transmission efficiency analysis for quantum secure direct communications over noisy channels 噪声信道下量子安全直接通信的传输效率分析
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-04-09 DOI: 10.1142/s0219749922500101
Xue-Ting Feng, Junfang Song, Chuan Wang
The concept of quantum secure direct communication (QSDC) is to distribute secure message directly between distant users securely, which is an important branch of quantum information science. The purpose of QSDC is to investigate the large capacity of quantum channels and fast speed of information transmission. However, the fidelity of qubits and the efficiency of QSDC will inevitably be affected by the channel noise and the decoherence of the quantum system. In this work, we focus on the performance of QSDC under different noisy channels, and investigate the evolution of quantum states. By numerically studying the performance for two QSDC protocols, we show the efficiency of information transmission over different noisy channel models.
量子安全直接通信(QSDC)的概念是在远程用户之间安全地直接分发安全消息,这是量子信息科学的一个重要分支。QSDC的目的是研究大容量的量子通道和快速的信息传输。然而,量子比特的保真度和QSDC的效率不可避免地会受到信道噪声和量子系统退相干的影响。在这项工作中,我们重点研究了QSDC在不同噪声信道下的性能,并研究了量子态的演化。通过数值研究两种QSDC协议的性能,我们展示了在不同噪声信道模型上信息传输的效率。
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引用次数: 0
Dynamical decoupling and NNN discrete quantum networks 动态解耦与NNN离散量子网络
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-03-30 DOI: 10.1142/s0219749922500095
A. Hoskovec, I. Jex
Perfect State Transfer is known to be possible on complex next-to-nearest-neighbor structures of qubits. The complexity of these networks coupled with the pervasive imperfections of the real world can lead to shortcomings in their practical construction. We analyze several realistic categories of flaws in the networks and show that they can have a harsh effect on the network’s performance. Dynamical decoupling is a known quantum error correction algorithm that can be used for partial or complete mitigation of undesired artefacts in quantum systems. We show here that dynamical decoupling can, in principle, also be used to stabilize the complex next-to-nearest-neighbor networks of qubits. We compare the proposed dynamical decoupling schemes with a baseline of dynamical decoupling scheme that eliminates all but one path to quantum state transfer on the network, thus effectively transforming it to a nearest-neighbor chain.
众所周知,在量子位的近邻结构上,完美状态转移是可能的。这些网络的复杂性,加上现实世界中普遍存在的缺陷,可能会导致其实际构建中的缺陷。我们分析了网络中几种现实的缺陷类别,并表明它们会对网络的性能产生严重影响。动态去耦是一种已知的量子纠错算法,可用于部分或完全缓解量子系统中不期望的伪影。我们在这里表明,原则上,动态解耦也可以用于稳定复杂的近邻量子位网络。我们将所提出的动态解耦方案与动态解耦方案的基线进行了比较,该基线消除了网络上除一条路径外的所有量子状态转移路径,从而有效地将其转换为最近邻链。
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引用次数: 2
Effect of initial squeezing on tripartite continuous-variable entanglement of dynamical processes 初始压缩对动力学过程三元连续变量纠缠的影响
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-03-30 DOI: 10.1142/s0219749922500083
Andri Pradana, Lock Yue Chew
In this paper, we investigate the effect of initial squeezing on tripartite continuous-variable (CV) Hamiltonians based on real physical systems. The Hamiltonians are based on the three-mode magnons excited by an external field, the one-dimensional interconnected tripartite spring-like system, and two spin ensembles coupled to a cavity resonator in the nondispersive regime in the CV limit. We find that for the three-mode magnons and the spring-like system, implementation of initial squeezing invariably enhances the two-way and three-way entanglement, while for the spin-resonator system, it depends on the alignment of the spin ensembles relative to the resonator field.
本文基于真实物理系统,研究了初始压缩对三元连续变量哈密顿量的影响。哈密顿量是基于由外部场激发的三模磁振子、一维互连的三重类弹簧系统以及在CV极限的非分散区域中耦合到腔谐振器的两个自旋系综。我们发现,对于三模磁振子和类弹簧系统,初始压缩的实现总是增强双向和三向纠缠,而对于自旋谐振器系统,这取决于自旋系综相对于谐振场的对准。
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引用次数: 0
Using measurement induced disturbance to characterize correlations of multipartite non-k-classical states 用测量引起的扰动表征多部分非k-经典态的相关性
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-03-26 DOI: 10.1142/s021974992250006x
Yinzhu Wang, Fang Zhou, Lili Yang, Donghua Yan, Hui Wu
In [S. L. Luo, Using measurement induced disturbance to characterize correlations as classical or quantum, Phys. Rev. A77 (2008) 022301], the author presented a statistical correlation measure for bipartite quantum states using measurement induced disturbance. In this paper, motivated by this correlation measure, we obtain some necessary conditions for [Formula: see text]-classical states in multipartite quantum systems, and obtain a relation between the set of [Formula: see text]-classical states and the set of [Formula: see text]-product states; Secondly, we introduce a class of correlation measures based on trace distance using measurement induced disturbance in order to quantify the strength of correlation for non-[Formula: see text]-classical states; Lastly, we introduce the concept of quantum channel with respect to [Formula: see text]-partition, it is simply denoted by identical-[Formula: see text]-channel, and furthermore discuss the influences of the correlation measure under identical-[Formula: see text]-channel.
在[S.L.Lo,使用测量诱导的扰动将相关性表征为经典或量子,Phys.Rev.A77(2008)022301]中,作者提出了使用测量诱导扰动的二分量子态的统计相关性度量。本文在这个相关测度的激励下,得到了多部分量子系统中[公式:见正文]-经典态的一些必要条件,并得到了[公式:看正文]-古典态的集合与[公式:见正文]-乘积态的集合之间的关系;其次,我们引入了一类基于迹线距离的相关测度,利用测度引起的扰动来量化非[公式:见正文]经典状态的相关性强度;最后,我们引入了关于[公式:见文本]-划分的量子通道的概念,它简单地用相同的-[公式:见图文本]-通道表示,并进一步讨论了相同的-[公式:见正文]-通道下相关测度的影响。
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引用次数: 0
An efficient approach for quantum entanglement purification 一种有效的量子纠缠纯化方法
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-02-28 DOI: 10.1142/s0219749922500046
Mummadi Swathi, Bhawana Rudra
Entanglement plays a major role in quantum information process and is a principal resource for various quantum applications like quantum teleportation, quantum key distribution, quantum communication, etc. Strong entangled pairs are required for efficient information process but system impurities during the transportation diminishes the entanglement by reducing the fidelity of the entangled pair. In order to reduce this, purification techniques can be used. In this paper, we propose an efficient entanglement purification method to distill the entanglement using entanglement swapping. The proposed method increases the fidelity of the entanglement and can be a proficient for various applications of quantum computing.
纠缠在量子信息处理中起着重要作用,是量子隐形传态、量子密钥分发、量子通信等各种量子应用的主要资源。高效的信息处理需要强纠缠对,但传输过程中的系统杂质通过降低纠缠对的保真度来减少纠缠。为了减少这种情况,可以使用纯化技术。在本文中,我们提出了一种利用纠缠交换提取纠缠的有效纠缠纯化方法。所提出的方法提高了纠缠的保真度,可以熟练地应用于量子计算的各种应用。
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引用次数: 5
Four-qubit states generated by Clifford gates Clifford gates生成的四量子位态
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-02-26 DOI: 10.1142/s0219749922500022
F. Latour, O. Perdomo
The Clifford group is the set of gates generated by controlled not (CNOT) gates and the two local gates [Formula: see text] and [Formula: see text]. We will say that an [Formula: see text]-qubit state is a Clifford state if it can be prepared using Clifford gates, this is, [Formula: see text] is Clifford if [Formula: see text] where [Formula: see text] is a Clifford gate. In this paper, we study the set of all 4-qubit Clifford states. We prove that there are 293760 states, each of which has entanglement entropy equal to 0, [Formula: see text], 1, [Formula: see text], or [Formula: see text]. We also show that any pair of these states can be connected using local gates and at most 3 CNOT gates. We also study the Clifford states with real entries under the action of the subgroup [Formula: see text] of Clifford gates with real entries. This time we show that every pair of Clifford states with real entries can be connected with at most 5 CNOT gates and local gates in [Formula: see text]. To understand the action of the 12 different CNOT gates, we partition the Clifford states into orbits using the equivalence relation: two states are equivalent if they differ by a local Clifford gate. We label each orbit in such a way that it is easy to see the effect of the CNOT gates. Diagrams and tables explaining the action of the CNOT gates on all the orbits are presented in the paper. The link https://youtu.be/42MI6ks2_eU leads to a YouTube video that explains the most important results in this paper.
Clifford群是由可控非(CNOT)门和两个局部门[公式:见文]和[公式:见文]生成的门的集合。我们说,如果一个[公式:见文]-量子比特状态可以用Clifford门来准备,那么它就是Clifford态,也就是说,如果[公式:见文]是Clifford门,那么[公式:见文]就是Clifford态,其中[公式:见文]是Clifford门。本文研究了所有4量子位Clifford态的集合。我们证明有293760个状态,每个状态的纠缠熵等于0,[公式:见文],1,[公式:见文],或[公式:见文]。我们还证明了任何一对这些状态都可以使用本地门和最多3个CNOT门连接。我们还研究了实数Clifford门在实数Clifford门子群作用下的实数Clifford状态[公式:见文]。这一次我们证明了在[公式:见文]中,每一对有实数条目的Clifford状态可以与最多5个CNOT门和局部门相连。为了理解12个不同的CNOT门的作用,我们使用等价关系将Clifford状态划分为轨道:如果两个状态相差一个局部Clifford门,则它们是等价的。我们以这样一种方式标记每个轨道,这样很容易看到CNOT门的影响。文中给出了CNOT门在所有轨道上的作用的图表和表格。链接https://youtu.be/42MI6ks2_eU指向一个YouTube视频,该视频解释了本文中最重要的结果。
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引用次数: 1
Optimization on Large Interconnected Graphs and Networks Using Adiabatic Quantum Computation 使用绝热量子计算的大型互联图和网络优化
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-02-06 DOI: 10.1142/s0219749923500260
Venkat Padmasola, Rupak Chatterjee
In this paper, we demonstrate that it is possible to create an adiabatic quantum computing algorithm that solves the shortest path between any two vertices on an undirected graph with at most 3V qubits, where V is the number of vertices of the graph. We do so without relying on any classical algorithms, aside from creating a (V x V) adjacency matrix. The objective of this paper is to demonstrate the fact that it is possible to model large graphs on an adiabatic quantum computer using the maximum number of qubits available and random graph generators such as the Barabasi-Albert and the Erdos-Renyi methods which can scale based on a power law.
在本文中,我们证明了可以创建一个绝热量子计算算法,该算法可以解决无向图上最多3V个量子比特的任意两个顶点之间的最短路径,其中V是图的顶点数。除了创建一个(V x V)邻接矩阵外,我们不依赖任何经典算法。本文的目的是证明这样一个事实,即可以使用可用的最大量子位和随机图形生成器(如Barabasi-Albert和Erdos-Renyi方法)在绝热量子计算机上模拟大型图形,这些方法可以基于幂律进行缩放。
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引用次数: 3
On genuine entanglement for tripartite systems 关于三元系统的真纠缠
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-01-21 DOI: 10.1142/S0219749921500386
Hui Zhao, Lin Liu, Zhixi Wang, N. Jing, Jing Li
In this paper, we investigate the genuine entanglement in tripartite systems based on partial transposition and the norm of correlation tensors of the density matrices. We first derive an analytical sufficient criterion to detect genuine entanglement of tripartite qubit states combining with the partial transposition of the density matrices. Then, we use the norm of correlation tensors to study genuine entanglement for tripartite qudit quantum states and obtain a genuine entanglement criterion by constructing certain matrices. With detailed examples, our results are seen to be able to detect more genuine tripartite entangled states than previous studies.
在本文中,我们研究了基于密度矩阵的相关张量的范数和部分换位的三元系统中的真纠缠。我们首先结合密度矩阵的部分换位,导出了一个检测三重量子位态真纠缠的充分解析准则。然后,我们利用相关张量的范数来研究三重量子态的真纠缠,并通过构造某些矩阵来获得真纠缠准则。通过详细的例子,我们的结果被认为能够检测到比以前的研究更真实的三方纠缠态。
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引用次数: 1
Evolution of Gaussian Rényi-2 quantum correlations in a squeezed thermal environment 压缩热环境下高斯r<s:1> -2量子相关的演化
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-01-21 DOI: 10.1142/s0219749921500362
Madalin Calamanciuc, A. Isar
In this paper, we investigate, in the framework of the theory of open quantum systems, based on completely positive dynamical semigroups, the Markovian dynamics of Gaussian Rényi-2 correlations — quantum entanglement, quantum discord, mutual information and classical correlations in a system composed of two bosonic modes, interacting with a squeezed thermal bath. We show that the time evolution of the Rényi-2 correlations strongly depends on the parameters of the initial Gaussian squeezed thermal state of the considered system and on the parameters characterizing the squeezed thermal bath. It is shown that while Gaussian Rényi-2 entanglement is suppressed in a finite time, due to the interaction with the squeezed thermal bath, the correlations beyond entanglement — Gaussian Rényi-2 discord, classical correlations and mutual information undergo a freezing-like behavior, namely they decay only asymptotically, in the limit of large times. We also illustrate a fundamental hierarchy for bipartite Gaussian correlations.
本文在开放量子系统理论的框架下,基于完全正动力学半群,研究了高斯Rényi-2关联的马尔可夫动力学——由两个玻色子模组成的系统中的量子纠缠、量子不和谐、互信息和经典关联,并与压缩热浴相互作用。我们证明了Rényi-2相关性的时间演化强烈依赖于所考虑系统的初始高斯压缩热态的参数和表征压缩热浴的参数。结果表明,当高斯Rényi-2纠缠在有限时间内被抑制时,由于与压缩热浴的相互作用,纠缠之外的关联——高斯Réanyi-2不和谐、经典关联和互信息——发生了类似冻结的行为,即它们在大次数的极限下仅渐近衰减。我们还说明了二分高斯相关的基本层次结构。
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引用次数: 0
The effects of common reservoirs on the performance of an autonomous three-level quantum refrigerator 普通储层对自主三能级量子制冷机性能的影响
IF 1.2 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2022-01-12 DOI: 10.1142/s0219749921500404
Yv-Ting Huang, Z. Man, Y. Xia
We study the effects of common reservoirs on the performance of an autonomous three-level quantum refrigerator. We show that the common reservoirs can result not only in additional transitions but also different types of interferences between them. For the case that the sole object to be cooled is a cold reservoir, it turns out that the cooling power can be greatly enhanced by the common reservoirs as well as by the induced interference. For the configuration that the refrigerator acts on both the cold reservoir and a qubit, we find that though the common reservoirs can improve the cooling power, which instead is detrimental to the cooling of the qubit. The interference also manifests different effects on the cooling of the cold reservoir and the qubit. Our results provide an evidence of possibility on applying the common reservoirs to enhance the performance of the refrigerator.
我们研究了常见储层对自主三能级量子冰箱性能的影响。我们表明,常见的储层不仅会导致额外的过渡,还会导致它们之间的不同类型的干扰。对于唯一要冷却的物体是冷储器的情况,事实证明,通过常见的储器以及诱导的干扰可以大大提高冷却能力。对于冰箱同时作用于冷库和量子位的配置,我们发现,尽管常见的库可以提高冷却功率,但这不利于量子位冷却。干扰对冷库和量子位的冷却也表现出不同的影响。我们的结果为应用普通储液器来提高冰箱性能提供了可能性的证据。
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引用次数: 0
期刊
International Journal of Quantum Information
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