Pub Date : 2024-02-14DOI: 10.1088/1612-202x/ad26eb
Semen A Kiriy, Dmitry A. Rymov, Andrey S. Svistunov, A. Shifrina, R. Starikov, P. Cheremkhin
Neural-network-based reconstruction of digital holograms can improve the speed and the quality of micro- and macro-object images, as well as reduce the noise and suppress the twin image and the zero-order. Usually, such methods aim to reconstruct the 2D object image or amplitude and phase distribution. In this paper, we investigated the feasibility of using a generative adversarial neural network to reconstruct 3D-scenes consisting of a set of cross-sections. The method was tested on computer-generated and optically-registered digital inline holograms. It enabled the reconstruction of all layers of a scene from each hologram. The reconstruction quality is improved 1.8 times when compared to the U-Net architecture on the normalized standard deviation value.
{"title":"Generative adversarial neural network for 3D-hologram reconstruction","authors":"Semen A Kiriy, Dmitry A. Rymov, Andrey S. Svistunov, A. Shifrina, R. Starikov, P. Cheremkhin","doi":"10.1088/1612-202x/ad26eb","DOIUrl":"https://doi.org/10.1088/1612-202x/ad26eb","url":null,"abstract":"\u0000 Neural-network-based reconstruction of digital holograms can improve the speed and the quality of micro- and macro-object images, as well as reduce the noise and suppress the twin image and the zero-order. Usually, such methods aim to reconstruct the 2D object image or amplitude and phase distribution. In this paper, we investigated the feasibility of using a generative adversarial neural network to reconstruct 3D-scenes consisting of a set of cross-sections. The method was tested on computer-generated and optically-registered digital inline holograms. It enabled the reconstruction of all layers of a scene from each hologram. The reconstruction quality is improved 1.8 times when compared to the U-Net architecture on the normalized standard deviation value.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839196","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}
The quench dynamics of strongly interacting bosons on quartic and sextic traps are studied by exactly solving the time-dependent many-boson Schrödinger equation numerically. The dynamics are addressed by the key measures of one-body density in conjugate space and information entropy. For both cases, rich many-body dynamics are exhibited and the loss of the Bose–Fermi oscillation in the Tonks–Girardeau limit is also attributed.
{"title":"Quench dynamics of a Tonks-Girardeau gas in one dimensional anharmonic trap","authors":"Pankaj Kumar Debnath, Barnali Chakrabarti, Mantile Leslie Lekala","doi":"10.1088/1612-202x/ad21eb","DOIUrl":"https://doi.org/10.1088/1612-202x/ad21eb","url":null,"abstract":"The quench dynamics of strongly interacting bosons on quartic and sextic traps are studied by exactly solving the time-dependent many-boson Schrödinger equation numerically. The dynamics are addressed by the key measures of one-body density in conjugate space and information entropy. For both cases, rich many-body dynamics are exhibited and the loss of the Bose–Fermi oscillation in the Tonks–Girardeau limit is also attributed.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757386","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}
Pub Date : 2024-02-07DOI: 10.1088/1612-202x/ad244a
Anh Nguyen Tuan, Thanh Thai Doan, Bang Nguyen Huy, Nga Luong Thi Yen, Dong Hoang Minh
We proposed a simple model for investigating subluminal and superluminal light propagation via an external magnetic field in an inhomogeneously broadened degenerate two-level atomic medium. We show that a magnetic field can be utilized as a knob to control the absorption/dispersion properties and group index of the medium. By changing the magnitude and reversing the direction of the magnetic field, the positive group index is converted to the negative group index at the center of the EIT window, corresponding with the propagation of a weak light pulse from subluminal to superluminal. Moreover, the influence of the Doppler broadening effect on the group index is also included, making the results approach to actual conditions. Therefore, the suggested model may be helpful for the application realization of optical storage in quantum computers and quantum information processing.
我们提出了一个简单的模型，用于研究亚光速和超光速光在不均匀拓宽的退化两级原子介质中通过外部磁场传播的情况。我们的研究表明，磁场可用作控制介质吸收/色散特性和群指数的旋钮。通过改变磁场的大小和反转磁场的方向，正群集指数会在 EIT 窗口的中心转换为负群集指数，这与微弱光脉冲从亚光速向超光速传播的过程相对应。此外，多普勒展宽效应对群集指数的影响也包括在内，从而使结果接近实际情况。因此，建议的模型可能有助于在量子计算机和量子信息处理中实现光存储的应用。
{"title":"Knob of adjusting light group velocity in an inhomogeneously broadened degenerate two-level atomic medium by a magnetic field","authors":"Anh Nguyen Tuan, Thanh Thai Doan, Bang Nguyen Huy, Nga Luong Thi Yen, Dong Hoang Minh","doi":"10.1088/1612-202x/ad244a","DOIUrl":"https://doi.org/10.1088/1612-202x/ad244a","url":null,"abstract":"We proposed a simple model for investigating subluminal and superluminal light propagation via an external magnetic field in an inhomogeneously broadened degenerate two-level atomic medium. We show that a magnetic field can be utilized as a knob to control the absorption/dispersion properties and group index of the medium. By changing the magnitude and reversing the direction of the magnetic field, the positive group index is converted to the negative group index at the center of the EIT window, corresponding with the propagation of a weak light pulse from subluminal to superluminal. Moreover, the influence of the Doppler broadening effect on the group index is also included, making the results approach to actual conditions. Therefore, the suggested model may be helpful for the application realization of optical storage in quantum computers and quantum information processing.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757388","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}
Pub Date : 2024-02-02DOI: 10.1088/1612-202x/ad21ec
Li-Hua Gong, Zi-Jie Ye, Chao Liu, Shun Zhou
Semi-quantum private comparison is a method for private comparison with fewer quantum resources, enabling classical participants to collaborate with a semi-honest third party possessing complete quantum capabilities. A one-way quantum private comparison protocol is devised only by unitary operations. The protocol facilitates one-way transmission between third party (TP) and classical participants in quantum communication, where the classical participants only need to perform unitary operations and measurement operations on the transmitted qubits. In addition, classical participants do not require pre-shared keys. It is shown that the qubit efficiency of this protocol is 12.5%. Finally, security analysis and the simulation results on the IBM Quantum Experience demonstrate the security and the feasibility of this protocol.
半量子私密比对是一种利用较少量子资源进行私密比对的方法，使经典参与者能够与拥有完全量子能力的半诚信第三方合作。单向量子私密比对协议仅通过单元运算设计。该协议促进了量子通信中第三方（TP）与经典参与者之间的单向传输，经典参与者只需对传输的量子比特执行单元操作和测量操作。此外，经典参与者不需要预共享密钥。研究表明，该协议的量子比特效率为 12.5%。最后，安全分析和在 IBM 量子体验上的仿真结果证明了该协议的安全性和可行性。
{"title":"One-way semi-quantum private comparison protocol without pre-shared keys based on unitary operations","authors":"Li-Hua Gong, Zi-Jie Ye, Chao Liu, Shun Zhou","doi":"10.1088/1612-202x/ad21ec","DOIUrl":"https://doi.org/10.1088/1612-202x/ad21ec","url":null,"abstract":"\u0000 Semi-quantum private comparison is a method for private comparison with fewer quantum resources, enabling classical participants to collaborate with a semi-honest third party possessing complete quantum capabilities. A one-way quantum private comparison protocol is devised only by unitary operations. The protocol facilitates one-way transmission between third party (TP) and classical participants in quantum communication, where the classical participants only need to perform unitary operations and measurement operations on the transmitted qubits. In addition, classical participants do not require pre-shared keys. It is shown that the qubit efficiency of this protocol is 12.5%. Finally, security analysis and the simulation results on the IBM Quantum Experience demonstrate the security and the feasibility of this protocol.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139683710","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}
Pub Date : 2024-02-01DOI: 10.1088/1612-202x/ad21ed
D A Gorlova, I N Tsymbalov, I P Tsygvintsev, A B Savelev
Direct laser electron acceleration in near-critical density plasma produces collimated electron beams with high charge Q (up to µC). This regime could be of interest for high-energy THz radiation generation, as many of the mechanisms have a scaling ∝Q2. In this work, we focus specifically on the challenges that arise during numerical investigations of transition radiation in such interactions. Detailed analytical calculations that include both the diffraction and decoherence effects of the characteristics of transition radiation in the THz range were conducted with the input parameters obtained from 3D particle-in-cell and hydrodynamic simulations. The calculated characteristics of THz radiation are in good agreement with the experimentally measured ones. Therefore, this approach can be used both to optimize the properties of THz radiation and to distinguish the transition radiation contribution if several mechanisms of THz radiation generation are considered.
{"title":"THz transition radiation of electron bunches laser-accelerated in long-scale near-critical-density plasmas","authors":"D A Gorlova, I N Tsymbalov, I P Tsygvintsev, A B Savelev","doi":"10.1088/1612-202x/ad21ed","DOIUrl":"https://doi.org/10.1088/1612-202x/ad21ed","url":null,"abstract":"Direct laser electron acceleration in near-critical density plasma produces collimated electron beams with high charge <italic toggle=\"yes\">Q</italic> (up to <italic toggle=\"yes\">µ</italic>C). This regime could be of interest for high-energy THz radiation generation, as many of the mechanisms have a scaling <inline-formula>\u0000<tex-math><?CDATA $propto Q^2$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mo>∝</mml:mo><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>\u0000<inline-graphic xlink:href=\"lplad21edieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. In this work, we focus specifically on the challenges that arise during numerical investigations of transition radiation in such interactions. Detailed analytical calculations that include both the diffraction and decoherence effects of the characteristics of transition radiation in the THz range were conducted with the input parameters obtained from 3D particle-in-cell and hydrodynamic simulations. The calculated characteristics of THz radiation are in good agreement with the experimentally measured ones. Therefore, this approach can be used both to optimize the properties of THz radiation and to distinguish the transition radiation contribution if several mechanisms of THz radiation generation are considered.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757569","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}
Pub Date : 2024-01-29DOI: 10.1088/1612-202x/ad1f4f
G P Liu, P H Mu, G Guo, X T Liu, G S Hu
In this paper, a novel method is proposed to generate high-quality chaotic signals using three cascade-coupled nano-lasers (NLs), and generate high-speed, high-quality random number sequences. The master NL (MNL) is subjected to optical feedback, and its output is injected into the intermediate NL (INL), which is further injected into the slave NL (SNL). In the simulation, we first adjust proper parameters so that the SNL generates a chaotic signal with a large bandwidth and time-delay signature concealment. After performing self-delayed differential processing on the chaotic signal, and utilizing an 8-bit analog-to-digital converter for sampling and quantization, followed by extraction of the m-bits least significant bit, the final random bit sequence is obtained. Finally, we use NIST SP 800-22 to test the generated random numbers. The results demonstrate that the obtained random number sequence successfully passed all tests specified by NIST SP 800-22.
{"title":"High-quality random bit generation based on a cascade-coupled nano-laser system","authors":"G P Liu, P H Mu, G Guo, X T Liu, G S Hu","doi":"10.1088/1612-202x/ad1f4f","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1f4f","url":null,"abstract":"In this paper, a novel method is proposed to generate high-quality chaotic signals using three cascade-coupled nano-lasers (NLs), and generate high-speed, high-quality random number sequences. The master NL (MNL) is subjected to optical feedback, and its output is injected into the intermediate NL (INL), which is further injected into the slave NL (SNL). In the simulation, we first adjust proper parameters so that the SNL generates a chaotic signal with a large bandwidth and time-delay signature concealment. After performing self-delayed differential processing on the chaotic signal, and utilizing an 8-bit analog-to-digital converter for sampling and quantization, followed by extraction of the m-bits least significant bit, the final random bit sequence is obtained. Finally, we use NIST SP 800-22 to test the generated random numbers. The results demonstrate that the obtained random number sequence successfully passed all tests specified by NIST SP 800-22.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757579","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}
Pub Date : 2024-01-24DOI: 10.1088/1612-202x/ad1f50
Fuyao Tian, Dianjun Lu, Chengxiang Wang, Weixin Yao
With the continuous development of quantum technology, the quantum signature as an application of quantum cryptography has received great attention. In this paper, we propose a public-key quantum group blind signature scheme based on single-qubit rotations. In this scheme, the group manager generates a public key. Each group member randomly generates his own private key according to the public key. The signer uses his private key and random sequence to generate the signature. The verifier uses the public key to verify the correctness of the quantum signature. The public and private keys can be reused, which simplifies the key management of the signature system. In this scheme, the random sequence is used to enhance the security of the scheme. At the same time, the quantum efficiency is improved by using single-qubit rotations. The security analysis shows that our scheme can ensure the security of the keys, the unforgeability and the non-deniability of the signature.
{"title":"A public-key quantum group blind signature scheme based on single-qubit rotations","authors":"Fuyao Tian, Dianjun Lu, Chengxiang Wang, Weixin Yao","doi":"10.1088/1612-202x/ad1f50","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1f50","url":null,"abstract":"\u0000 With the continuous development of quantum technology, the quantum signature as an application of quantum cryptography has received great attention. In this paper, we propose a public-key quantum group blind signature scheme based on single-qubit rotations. In this scheme, the group manager generates a public key. Each group member randomly generates his own private key according to the public key. The signer uses his private key and random sequence to generate the signature. The verifier uses the public key to verify the correctness of the quantum signature. The public and private keys can be reused, which simplifies the key management of the signature system. In this scheme, the random sequence is used to enhance the security of the scheme. At the same time, the quantum efficiency is improved by using single-qubit rotations. The security analysis shows that our scheme can ensure the security of the keys, the unforgeability and the non-deniability of the signature.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139602808","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}
Pub Date : 2024-01-24DOI: 10.1088/1612-202x/ad1502
A. Nastulyavichus, Sergey Kudryashov, S. Shelygina, Evgenia Ulturgasheva, Irina Dzhun, Polina Krikunova, Тatiana Pallaeva, Pham Hong Minh, Pham Van Duong, Sergey Gonchukov
The feasibility of printing silver and copper conductive elements on a glass substrate in a one- step through the laser-induced forward transfer method has been successfully demonstrated. The topography of the resulting elements was analyzed, using scanning electron microscopy. Investigation of their chemical composition was conducted by means of energy-dispersive x-ray spectroscopy and x-ray diffraction, revealing that both silver and copper in their metallic nanocrystalline state. The maximum specific conductivity of ≈6 kS cm−1 was achieved for both silver and copper at the optimal scanning speed of 3800 mm s−1, providing two-pulse printing with the laser transfer by the first pulse and laser annealing by the second one. The proposed method facilitates the technological additive printing process of conductive elements and rises its throughput.
通过激光诱导正向转移法在玻璃基板上一步印制银和铜导电元件的可行性已得到成功验证。利用扫描电子显微镜分析了所得元件的形貌。通过能量色散 X 射线光谱法和 X 射线衍射法对其化学成分进行了研究，结果表明银和铜都处于金属纳米结晶状态。在 3800 mm s-1 的最佳扫描速度下，银和铜的最大比电导率都达到了 ≈6 kS cm-1。所提出的方法促进了导电元件的技术添加式打印过程，并提高了其产量。
{"title":"One-step additive LIFT printing of conductive elements","authors":"A. Nastulyavichus, Sergey Kudryashov, S. Shelygina, Evgenia Ulturgasheva, Irina Dzhun, Polina Krikunova, Тatiana Pallaeva, Pham Hong Minh, Pham Van Duong, Sergey Gonchukov","doi":"10.1088/1612-202x/ad1502","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1502","url":null,"abstract":"\u0000 The feasibility of printing silver and copper conductive elements on a glass substrate in a one- step through the laser-induced forward transfer method has been successfully demonstrated. The topography of the resulting elements was analyzed, using scanning electron microscopy. Investigation of their chemical composition was conducted by means of energy-dispersive x-ray spectroscopy and x-ray diffraction, revealing that both silver and copper in their metallic nanocrystalline state. The maximum specific conductivity of ≈6 kS cm−1 was achieved for both silver and copper at the optimal scanning speed of 3800 mm s−1, providing two-pulse printing with the laser transfer by the first pulse and laser annealing by the second one. The proposed method facilitates the technological additive printing process of conductive elements and rises its throughput.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139601753","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}
Pub Date : 2024-01-24DOI: 10.1088/1612-202x/ad1f4e
M. D. Truong, Quang Dat Tran
The family of two-mode non-Gaussian entangled states, including the pair coherent states (PCSs) and their genealogies, has been extensively investigated regarding their quantum properties and their practical applications in quantum information. Specifically, certain states, such as the multiphoton catalytic pair coherent states (MCPCSs), have been newly introduced under specific experimental conditions. For a more feasible approach, in this paper, we introduce novel nonclassical states obtained by subtracting photons through conditional measurements using beam splitters applied to the two modes of the PCSs. These states are called pair coherent states with conditional measurements (PCSCMs). Our purpose is to demonstrate that the quantum features, such as entanglement, Einstein–Podolsky–Rosen (EPR) correlation, EPR steering, and the average fidelity in teleportation can be enhanced in comparison with both the original PCSs and the MCPCSs. In specific cases, several characteristics are observed in PCSCMs but not inspected in both PCSs and MCPCSs. In our findings, we prove that the quantum characteristics within the PCSCMs are influenced not just by the number of detected photons, denoted by variables k and l, but also by the discrepancy in photon numbers, especially by the difference of k − l.
双模式非高斯纠缠态家族，包括对相干态（PCSs）及其谱系，其量子特性及其在量子信息中的实际应用已被广泛研究。具体来说，某些态，如多光子催化对相干态（MCPCSs），是在特定实验条件下新引入的。为了采用更可行的方法，我们在本文中引入了新的非经典态，通过使用分束器对多光子催化对相干态的两个模式进行条件测量，减去光子而得到这些态。这些状态被称为有条件测量的成对相干态（PCSCMs）。我们的目的是证明，与原始 PCS 和 MCPCS 相比，量子特性，如纠缠、爱因斯坦-波多尔斯基-罗森（EPR）相关性、EPR 转向和远距传物中的平均保真度都能得到增强。在特定情况下，我们在 PCSCM 中观察到了一些特性，但在 PCS 和 MCPCS 中却没有发现。我们的研究结果证明，PCSCM 中的量子特性不仅受检测到的光子数量（用变量 k 和 l 表示）的影响，还受光子数量差异的影响，尤其是 k - l 的差异。
{"title":"Enhancing quantum features and teleportation fidelity of two-mode non-Gaussian states using conditional measurements","authors":"M. D. Truong, Quang Dat Tran","doi":"10.1088/1612-202x/ad1f4e","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1f4e","url":null,"abstract":"\u0000 The family of two-mode non-Gaussian entangled states, including the pair coherent states (PCSs) and their genealogies, has been extensively investigated regarding their quantum properties and their practical applications in quantum information. Specifically, certain states, such as the multiphoton catalytic pair coherent states (MCPCSs), have been newly introduced under specific experimental conditions. For a more feasible approach, in this paper, we introduce novel nonclassical states obtained by subtracting photons through conditional measurements using beam splitters applied to the two modes of the PCSs. These states are called pair coherent states with conditional measurements (PCSCMs). Our purpose is to demonstrate that the quantum features, such as entanglement, Einstein–Podolsky–Rosen (EPR) correlation, EPR steering, and the average fidelity in teleportation can be enhanced in comparison with both the original PCSs and the MCPCSs. In specific cases, several characteristics are observed in PCSCMs but not inspected in both PCSs and MCPCSs. In our findings, we prove that the quantum characteristics within the PCSCMs are influenced not just by the number of detected photons, denoted by variables k and l, but also by the discrepancy in photon numbers, especially by the difference of k − l.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139599766","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}
Pub Date : 2024-01-22DOI: 10.1088/1612-202x/ad1cdc
Zhicai Chen, Fei Wang
In this paper, we show that the cross-Kerr nonlinearity is induced by the ground-state decoherence in a Λ system even under the exact one- and two-photon resonance conditions, which is attributed to the fact that the dark-state resonance is broken slightly. By adiabatically eliminating the atomic variables, we find that the decoherence results in a frequency shift of cavity detuning and the two cavity fields experience cross-Kerr nonlinearity by choosing appropriate parameters. As a consequence, the internal nonlinear effects are responsible for the generation of light entanglement, which is verified by our numerical results. The present scheme demonstrates that the decoherence plays a positive role in controlling quantum entanglement, which may be useful for quantum information processing.
{"title":"Decoherence-induced cross-Kerr nonlinearity for quantum entanglement","authors":"Zhicai Chen, Fei Wang","doi":"10.1088/1612-202x/ad1cdc","DOIUrl":"https://doi.org/10.1088/1612-202x/ad1cdc","url":null,"abstract":"\u0000 In this paper, we show that the cross-Kerr nonlinearity is induced by the ground-state decoherence in a Λ system even under the exact one- and two-photon resonance conditions, which is attributed to the fact that the dark-state resonance is broken slightly. By adiabatically eliminating the atomic variables, we find that the decoherence results in a frequency shift of cavity detuning and the two cavity fields experience cross-Kerr nonlinearity by choosing appropriate parameters. As a consequence, the internal nonlinear effects are responsible for the generation of light entanglement, which is verified by our numerical results. The present scheme demonstrates that the decoherence plays a positive role in controlling quantum entanglement, which may be useful for quantum information processing.","PeriodicalId":17940,"journal":{"name":"Laser Physics Letters","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139606615","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}
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