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Quantum state classification via complex-valued neural networks 通过复值神经网络进行量子态分类
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-09-06 DOI: 10.1088/1612-202x/ad7246
Yu-Chao Dong, Xi-Kun Li, Ming Yang, Yan Lu, Yan-Lin Liao, Arif Ullah, Zhi Lin
{"title":"Quantum state classification via complex-valued neural networks","authors":"Yu-Chao Dong, Xi-Kun Li, Ming Yang, Yan Lu, Yan-Lin Liao, Arif Ullah, Zhi Lin","doi":"10.1088/1612-202x/ad7246","DOIUrl":"https://doi.org/10.1088/1612-202x/ad7246","url":null,"abstract":"To efficiently complete quantum information processing tasks, quantum neural networks (QNNs) should be introduced rather than the common classical neural networks, but the QNNs in the current noisy intermediate-scale quantum era cannot perform better than classical neural networks because of scale and the efficiency limits. So if the quantum properties can be introduced into classical neural networks, more efficient classical neural networks may be constructed for tasks in the field of quantum information. Complex numbers play an indispensable role in the standard quantum theory, and constitute an important feature in quantum theory. So if complex numbers are introduced in classical neural networks, they may outperform the common classical neural networks in dealing with the tasks in the quantum information field. In this paper, we verify this conjecture by studying quantum state classification via complex-valued neural networks (CVNNs). The numerical results show that the performance of CVNNs is much better than the real-valued neural network in classifying the entangled states. Our results not only provide a new way to improve the performance of artificial neural networks in quantum state classifiers, but also might shed light on the study of CVNNs in the field of other quantum information processing tasks before the appearance of the universal quantum computer.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"9 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Semiquantum private comparison based on Bell states without quantum measurements from the classical user 基于贝尔态的半量子私密比较，无需经典用户进行量子测量
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-09-04 DOI: 10.1088/1612-202x/ad72de
Mao-Jie Geng, Xia Li, Tian-Yu Ye
{"title":"Semiquantum private comparison based on Bell states without quantum measurements from the classical user","authors":"Mao-Jie Geng, Xia Li, Tian-Yu Ye","doi":"10.1088/1612-202x/ad72de","DOIUrl":"https://doi.org/10.1088/1612-202x/ad72de","url":null,"abstract":"In this paper, we propose a novel semiquantum private comparison (SQPC) protocol based on Bell states, which enables one quantum user and one classical user to compare the equality of their private inputs with the help of a semi-honest quantum third party (TP). TP is assumed to be semi-honest in the sense that she may take all possible attacks to steal users’ private inputs except conspiring with anyone. The security analysis validates that our protocol can resist not only the attacks from internal participants but also the attacks from an external eavesdropper. Besides, our protocol only asks TP to perform Bell basis measurements but does not need quantum entanglement swapping; and it releases the classical user from conducting quantum measurements and having a quantum memory. Moreover, our protocol can take advantage over previous SQPC protocols based on Bell states in qubit efficiency. Finally, our protocol can be generalized into its counterpart of the collective-dephasing noise quantum channel.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"23 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tighter uncertainty relations based on Wigner–Yanase skew information for N quantum channels 基于 Wigner-Yanase 偏斜信息的 N 量子信道的更严格不确定性关系
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-30 DOI: 10.1088/1612-202x/ad7252
Quan Zhang, Xu Zheng, Qiong Guo
{"title":"Tighter uncertainty relations based on Wigner–Yanase skew information for N quantum channels","authors":"Quan Zhang, Xu Zheng, Qiong Guo","doi":"10.1088/1612-202x/ad7252","DOIUrl":"https://doi.org/10.1088/1612-202x/ad7252","url":null,"abstract":"In this paper, we build some uncertainty relations for arbitrary <italic toggle=\"yes\">N</italic> quantum channels based on the Wigner–Yanase skew information. It is shown that our lower bounds are stronger than the ones proposed by Zhang <italic toggle=\"yes\">et al</italic> (2021 <italic toggle=\"yes\">Phys. Lett.</italic> A <bold>387</bold> 127029; 2021 <italic toggle=\"yes\">Laser Phys. Lett.</italic> <bold>18</bold> 095204) respectively in all intervals. In particular, we derive several uncertainty relations for <italic toggle=\"yes\">N</italic> unitary channels. Moreover, we establish several descending sequences of lower bounds for the uncertainty relations of <italic toggle=\"yes\">N</italic> quantum channels. Detailed examples are provided.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"9 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bidirectional quantum teleportation in continuous variables 连续变量中的双向量子传送
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-30 DOI: 10.1088/1612-202x/ad72df
E A Nesterova, S B Korolev
{"title":"Bidirectional quantum teleportation in continuous variables","authors":"E A Nesterova, S B Korolev","doi":"10.1088/1612-202x/ad72df","DOIUrl":"https://doi.org/10.1088/1612-202x/ad72df","url":null,"abstract":"We propose a bidirectional quantum teleportation (BQT) protocol in continuous variables. We use a cluster state in continuous variables as the main resource to realize this protocol. In the paper, we obtain a family of configurations of cluster states in continuous variables that can be used to realize the BQT protocol. From the whole family of configurations, we have chosen those that realize the protocol with the smallest possible error.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"19 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum coherence protection by utilizing hybrid noise 利用混合噪声保护量子相干性
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-30 DOI: 10.1088/1612-202x/ad72d8
Jiahui Feng, Tengtao Guo, Yuxuan Zhou, Xinyu Zhao, Yan Xia
{"title":"Quantum coherence protection by utilizing hybrid noise","authors":"Jiahui Feng, Tengtao Guo, Yuxuan Zhou, Xinyu Zhao, Yan Xia","doi":"10.1088/1612-202x/ad72d8","DOIUrl":"https://doi.org/10.1088/1612-202x/ad72d8","url":null,"abstract":"Noise is often considered as the biggest enemy of maintaining quantum coherence. However, in this paper, we show a scheme to protect quantum coherence by introducing extra noise. To be specific, we study an atom coupled to a single mode cavity (Jaynes–Cummings model) with two noises. One is from the cavity leakage, the other is from the stochastic atom-cavity coupling. Based on the non-Markovian dynamical equation, we show the quantum coherence can be protected by introducing the noise in the atom-cavity coupling. We study four different types of noises and show their performance on the coherence protection. We also analytically reveal the mechanism of the quantum coherence protection, namely the high frequency noise can freeze the dynamics thus protect coherence. Last but not least, a mixture of different types of noises (hybrid noise) is studied. We show the mixture can lower the performance of the coherence protection scheme and provide an explanation. We hope the results presented here may attract more attention on protecting quantum coherence by utilizing noise.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"46 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal conductivity analysis of nanofluid through laser speckle method 通过激光斑点法分析纳米流体的导热性
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-30 DOI: 10.1088/1612-202x/ad7251
Jayashree Sa, Amita Tripathy, Ganeswar Nath
{"title":"Thermal conductivity analysis of nanofluid through laser speckle method","authors":"Jayashree Sa, Amita Tripathy, Ganeswar Nath","doi":"10.1088/1612-202x/ad7251","DOIUrl":"https://doi.org/10.1088/1612-202x/ad7251","url":null,"abstract":"The significance of laser interaction in assessing the stability of colloidal CeO<sub>2</sub> nanoparticles (NPs) in water medium is highlighted in this study. Utilizing the laser speckle technique, a non-destructive optical method, the activities of NPs synthesized in continuous wave (CW) mode are examined. The size of the cerium oxide NPs is determined through Particle Size Analyzer technique. The fluctuation in intensity of laser speckle scattered from various particles reflects the configuration of NPs in the base fluid medium, offering valuable insights into their stability. Further confirmation of NP stability is obtained through UV–Visible absorption spectroscopy. The examination of CeO<sub>2</sub> NPs in deionized water is conducted with a CW mode He–Ne laser operating at 632 nm. This laser interaction approach proves to be instrumental in evaluating the thermal properties of the prepared samples, particularly the thermal conductivity, which shows enhancements at varying concentrations and temperatures. The findings demonstrate the potential of fabricating CeO<sub>2</sub>-water nanofluids with improved thermal conductivity through laser interaction in a liquid medium, thereby eliminating the need for hazardous chemicals and vacuum conditions. This suggests promising applications in medium-temperature scenarios.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal quantum correlations and disorder in a fermionic system described by the extended Fermi–Hubbard-like model 扩展费米-哈伯德类模型描述的费米系统中的热量子相关性和无序性
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-23 DOI: 10.1088/1612-202x/ad6e6d
Mohamed Essakhi, Mostafa Mansour
{"title":"Thermal quantum correlations and disorder in a fermionic system described by the extended Fermi–Hubbard-like model","authors":"Mohamed Essakhi, Mostafa Mansour","doi":"10.1088/1612-202x/ad6e6d","DOIUrl":"https://doi.org/10.1088/1612-202x/ad6e6d","url":null,"abstract":"This research investigates thermal quantum correlations in a fermionic system modeled using an extended Fermi–Hubbard-like model. We examine the impacts of noisy temperature, local chemical potential, and nearest-neighbor interaction. The Fermi–Hubbard model provides a framework for understanding fermion interactions in a lattice and shows potential for simulating fermionic systems with superconducting circuits in quantum simulation. Using the Jordan–Wigner transformation, we convert the fermionic system into a qubit system, bridging quantum information and particle physics. Thermal entanglement is assessed using concurrence measurement, while thermal quantum correlations are measured through trace distance discord and local quantum uncertainty. Our findings indicate that increasing temperature causes disorder, negatively affecting quantum entanglement and correlations. However, by adjusting the nearest-neighbor interaction strength and local potential, we can mitigate thermal noise effects, enhancing correlations and entanglement. Selecting appropriate parameters can ensure the system’s potential for quantum technology development.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"7 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase-mediated single-photon scattering and nonreciprocal transmission in a coupled resonator waveguide with a three-level giant atom 带有三电平巨原子的耦合谐振器波导中的相位介导单光子散射和非互易传输
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-21 DOI: 10.1088/1612-202x/ad6e64
Keke Chen, Zhonghua Zhu, Yuqing Zhang, Xiangyun Fu, Zhaohui Peng, Zhenyan Lu, Yifeng Chai, Zuzhou Xiong, Lei Tan
{"title":"Phase-mediated single-photon scattering and nonreciprocal transmission in a coupled resonator waveguide with a three-level giant atom","authors":"Keke Chen, Zhonghua Zhu, Yuqing Zhang, Xiangyun Fu, Zhaohui Peng, Zhenyan Lu, Yifeng Chai, Zuzhou Xiong, Lei Tan","doi":"10.1088/1612-202x/ad6e64","DOIUrl":"https://doi.org/10.1088/1612-202x/ad6e64","url":null,"abstract":"We theoretically investigate single-photon scattering and nonreciprocal transmission in a coupled resonator waveguide which is coupled to a driven three-level giant atom via two distant sites. In our system, the local coupling phases are introduced to induce intriguing interference effects. As a result, the phase difference can serve as a sensitive controller for the photon scattering. It is found that the photon scattering properties can be effectively tailored by the size of the giant atom, the driving field and the phase difference. Intriguingly, by carefully tuning the parameters such as the atomic dissipation and the phase difference, a perfect nonreciprocal single-photon transmission can be realized. Additionally, the photon frequency can be adjusted by modulating Rabi frequency of the driving field. These results have significant potential for the development of nonreciprocal optical devices using the giant-atom configuration.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"19 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation on gain-managed nonlinearity in Mamyshev oscillators 关于马迈雪夫振荡器中增益管理非线性的研究
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-21 DOI: 10.1088/1612-202x/ad6e66
Sihua Lu, Wei Guo, Baofu Zhang, Qiurun He, Zhongxing Jiao, Tianshu Lai
{"title":"Investigation on gain-managed nonlinearity in Mamyshev oscillators","authors":"Sihua Lu, Wei Guo, Baofu Zhang, Qiurun He, Zhongxing Jiao, Tianshu Lai","doi":"10.1088/1612-202x/ad6e66","DOIUrl":"https://doi.org/10.1088/1612-202x/ad6e66","url":null,"abstract":"Mamyshev oscillators and gain-managed nonlinear (GMN) amplifiers have the capability to generate high-power sub-50 fs pulses, but their close relationship has not been systematically investigated. In this paper, we numerically study the influence of gain-managed nonlinearity on the laser evolution and output characteristics of the Mamyshev oscillator. The impact of the gain fibre length, as well as the central wavelength and bandwidth of spectral filters on GMN evolution in the laser are investigated. The results indicate that optimizing these cavity parameters can lead to the GMN evolution, which can improve the output peak power by 1.5–4 times in Mamyshev oscillators.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"34 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimation of the set of states obtained in particle number measurement schemes 估计粒子数测量方案中获得的状态集
IF 1.7 4区 物理与天体物理
Laser Physics Letters Pub Date : 2024-08-21 DOI: 10.1088/1612-202x/ad6e6f
S B Korolev, E N Bashmakova, T Yu Golubeva
{"title":"Estimation of the set of states obtained in particle number measurement schemes","authors":"S B Korolev, E N Bashmakova, T Yu Golubeva","doi":"10.1088/1612-202x/ad6e6f","DOIUrl":"https://doi.org/10.1088/1612-202x/ad6e6f","url":null,"abstract":"The paper investigated a set of non-Gaussian states generated by measuring the number of particles in one of the modes of a two-mode entangled Gaussian state. It was demonstrated that all generated states depend on two types of parameters: some parameters are responsible for Gaussian characteristics, while other parameters are responsible for non-Gaussian characteristics. Among all generated states, we identified those optimally generated in terms of the generation probability and the magnitude of non-Gaussianity.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":"19 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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