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Two-orbital quantum discord in fermion systems 费米子系统中的双轨道量子不和谐
arXiv: Quantum Physics Pub Date : 2020-12-02 DOI: 10.1103/PHYSREVA.103.032426
J. Faba, V. Mart'in, L. Robledo
{"title":"Two-orbital quantum discord in fermion systems","authors":"J. Faba, V. Mart'in, L. Robledo","doi":"10.1103/PHYSREVA.103.032426","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.032426","url":null,"abstract":"A simple expression to compute the quantum discord between two orbitals in fermion systems is derived using the parity superselection rule. As the correlation between orbitals depends on the basis chosen, we discuss a special orbital basis, the natural one. We show that quantum correlations between natural orbital pairs disappear when the pairing tensor is zero, i.e. the particle number symmetry is preserved. The Hartree-Fock orbitals within a Slater determinant state, a Hartree-Fock-Bogoliubov quasiparticle orbitals in a quasiparticle vacuum, or the ground state of a Hamiltonian with particle symmetry and their corresponding natural orbitals are some relevant examples of natural basis and their corresponding states. Since natural orbitals have that special property, we seek for the quantum discord in non-natural orbital basis. We analyze our findings in the context of the Lipkin-Meshkov-Glick and Agassi models.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88593916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Antibunched photon-pair source based on photon blockade in a nondegenerate optical parametric oscillator 非简并光学参量振荡器中基于光子阻断的反束光子对源
arXiv: Quantum Physics Pub Date : 2020-12-01 DOI: 10.1103/PhysRevA.103.053710
Yi-Chong Ren, S. Duan, W. Xie, Yongkang Shao, Z. Duan
{"title":"Antibunched photon-pair source based on photon blockade in a nondegenerate optical parametric oscillator","authors":"Yi-Chong Ren, S. Duan, W. Xie, Yongkang Shao, Z. Duan","doi":"10.1103/PhysRevA.103.053710","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.053710","url":null,"abstract":"Nonclassical light sources, such as correlated photon-pairs, play an important role in quantum optics and quantum information processing systems. This study proposes a process to generate antibunched photon-pairs in a nondegenerate optical parametric oscillator. It is found that when the parameters of the system satisfy certain conditions, the generated photons in subharmonic modes exhibit a strong antibunching behavior and are strongly correlated with one another. In particular, the average photon-pair number is resonantly enhanced. It is also observed that the conventional photon blockade contributes to this phenomenon. In addition, it is interesting to note that fundamental mode photons can blockade the subharmonic mode photons. We refer to this phenomenon as a heterogeneous photon blockade.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79236190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Quantum Physics without the Physics 没有物理学的量子物理学
arXiv: Quantum Physics Pub Date : 2020-12-01 DOI: 10.2172/1729745
N. Petersson, Fortino Garcia, D. Appelo, S. Guenther, Y. Choi, Ryan H. Vogt
{"title":"Quantum Physics without the Physics","authors":"N. Petersson, Fortino Garcia, D. Appelo, S. Guenther, Y. Choi, Ryan H. Vogt","doi":"10.2172/1729745","DOIUrl":"https://doi.org/10.2172/1729745","url":null,"abstract":"This report explains the basic theory and common terminology of quantum physics without assuming any knowledge of physics. It was written by a group of applied mathematicians while they were reading up on the subject. The intended audience consists of applied mathematicians, computer scientists, or anyone else who wants to improve their understanding of quantum physics. We assume that the reader is familiar with fundamental concepts of linear algebra, differential equations, and to some extent the theory of Hilbert spaces. Most of the material can be found in the book by Nielsen and Chuang and in the lecture notes on open quantum systems by Lidar. Another excellent online source of information is Wikipedia, even though most of its articles on quantum physics assume a solid understanding of physics.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77251913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Quantum Algorithms for String Processing. 字符串处理的量子算法。
arXiv: Quantum Physics Pub Date : 2020-12-01 DOI: 10.1007/978-3-030-87809-2_1
F. Ablayev, M. Ablayev, K. Khadiev, Nailya Salihova, Alexander Vasiliev
{"title":"Quantum Algorithms for String Processing.","authors":"F. Ablayev, M. Ablayev, K. Khadiev, Nailya Salihova, Alexander Vasiliev","doi":"10.1007/978-3-030-87809-2_1","DOIUrl":"https://doi.org/10.1007/978-3-030-87809-2_1","url":null,"abstract":"","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83759783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Two-photon superbunching effect of broadband chaotic light at the femtosecond timescale based on a cascaded Michelson interferometer 基于级联迈克尔逊干涉仪的飞秒级宽频带混沌光双光子超聚束效应
arXiv: Quantum Physics Pub Date : 2020-11-30 DOI: 10.1103/PHYSREVA.103.013723
Sheng Luo, Yu Zhou, Huaibin Zheng, Jianbin Liu, Hui Chen, Yuchen He, Wanting Xu, Shuanghao Zhang, Fuli Li, Zhuo Xu
{"title":"Two-photon superbunching effect of broadband chaotic light at the femtosecond timescale based on a cascaded Michelson interferometer","authors":"Sheng Luo, Yu Zhou, Huaibin Zheng, Jianbin Liu, Hui Chen, Yuchen He, Wanting Xu, Shuanghao Zhang, Fuli Li, Zhuo Xu","doi":"10.1103/PHYSREVA.103.013723","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.013723","url":null,"abstract":"It is challenging for observing superbunching effect with true chaotic light, here we propose and demonstrate a method to achieve superbunching effect of the degree of second-order coherence is 2.42 with broadband stationary chaotic light based on a cascaded Michelson interferometer (CMI), exceeding the theoretical upper limit of 2 for the two-photon bunching effect of chaotic light. The superbunching correlation peak is measured with an ultrafast two-photon absorption detector which the full width at half maximum reaches about 95 fs. Two-photon superbunching theory in a CMI is developed to interpret the effect and is in agreement with experimental results. The theory also predicts that the degree of second-order coherence can be much greater than $2$ if chaotic light propagates $N$ times in a CMI. Finally, a new type of weak signals detection setup which employs broadband chaotic light circulating in a CMI is proposed. Theoretically, it can increase the detection sensitivity of weak signals 79 times after the chaotic light circulating 100 times in the CMI.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80781178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Optical focusing of Bose-Einstein condensates 玻色-爱因斯坦凝聚体的光学聚焦
arXiv: Quantum Physics Pub Date : 2020-11-29 DOI: 10.1103/PhysRevA.103.063304
R. Richberg, S. Szigeti, A. M. Martin
{"title":"Optical focusing of Bose-Einstein condensates","authors":"R. Richberg, S. Szigeti, A. M. Martin","doi":"10.1103/PhysRevA.103.063304","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.063304","url":null,"abstract":"We theoretically investigate the optical focusing of a rubidium Bose-Einstein condensate onto a planar surface. Our analysis uses a Gaussian variational method that includes the effects of two-body atom-atom interactions and three-body recombination losses. The essential factors such as the width, peak density and atom loss rate of the focused BEC profile on the surface are investigated and compared to Gross-Pitaevskii numerical simulations. We find a reasonable agreement in the results between our analytical approach and the numerical simulations. Our analysis predicts that condensates of $10^5$ atoms could be focused down to $sim 10$nm widths, potentially allowing nanometer-scale atomic deposition with peak densities greater than $10^5$ atoms/$mu$m$^2$.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78518904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Nonuniform phases in the geometrically frustrated dissipative XYZ model 几何受挫耗散XYZ模型中的非均匀相位
arXiv: Quantum Physics Pub Date : 2020-11-29 DOI: 10.1103/PHYSREVB.103.035127
Xingli Li, Jiasen Jin
{"title":"Nonuniform phases in the geometrically frustrated dissipative XYZ model","authors":"Xingli Li, Jiasen Jin","doi":"10.1103/PHYSREVB.103.035127","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.035127","url":null,"abstract":"We investigate the steady-state phase diagram of the dissipative spin-1/2 XYZ model on a two-dimensional triangular lattice, in which each site is coupled to a local environment. By means of cluster mean-field approximation, we find that the steady-state phases of the system is rather rich, in particular there exists various types of nonuniform antiferromagnetic phases due to the geometrical frustration. As the short-ranges correlations included in the analysis, we rule out the oscillatory phase and confirm the existence of triantiferromagnetic and biantiferromagnetic phases in the thermodynamic limit. Moreover, the existence of spin-density-wave phase, which is missed by the single-site mean-field analysis, is also revealed by spin-structure factor.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83405973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Engineering analog quantum chemistry Hamiltonians using cold atoms in optical lattices 利用光学晶格中的冷原子进行工程模拟量子化学哈密顿量
arXiv: Quantum Physics Pub Date : 2020-11-28 DOI: 10.1103/PHYSREVA.103.043318
Javier Argüello-Luengo, T. Shi, A. Gonz'alez-Tudela
{"title":"Engineering analog quantum chemistry Hamiltonians using cold atoms in optical lattices","authors":"Javier Argüello-Luengo, T. Shi, A. Gonz'alez-Tudela","doi":"10.1103/PHYSREVA.103.043318","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.043318","url":null,"abstract":"Using quantum systems to efficiently solve quantum chemistry problems is one of the long-sought applications of near-future quantum technologies. In a recent work, ultra-cold fermionic atoms have been proposed for these purposes by showing how to simulate in an analog way the quantum chemistry Hamiltonian projected in a lattice basis set. Here, we continue exploring this path and go beyond these first results in several ways. First, we numerically benchmark the working conditions of the analog simulator, and find less demanding experimental setups where chemistry-like behaviour in three-dimensions can still be observed. We also provide a deeper understanding of the errors of the simulation appearing due to discretization and finite size effects and provide a way to mitigate them. Finally, we benchmark the simulator characterizing the behaviour of two-electron atoms (He) and molecules (HeH$^+$) beyond the example considered in the original work.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89756712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Simulating hadronic physics on noisy intermediate-scale quantum devices using basis light-front quantization 用基光前量子化模拟噪声中尺度量子器件上的强子物理
arXiv: Quantum Physics Pub Date : 2020-11-26 DOI: 10.1103/PhysRevA.103.062601
Michael Kreshchuk, Shaoyang Jia, William M. Kirby, G. Goldstein, J. Vary, P. Love
{"title":"Simulating hadronic physics on noisy intermediate-scale quantum devices using basis light-front quantization","authors":"Michael Kreshchuk, Shaoyang Jia, William M. Kirby, G. Goldstein, J. Vary, P. Love","doi":"10.1103/PhysRevA.103.062601","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.062601","url":null,"abstract":"The analogy between quantum chemistry and light-front quantum field theory, first noted by Kenneth G. Wilson, serves as motivation to develop light-front quantum simulation of quantum field theory. We demonstrate how calculations of hadron structure can be performed on Noisy Intermediate-Scale Quantum devices within the Basis Light-Front Quantization framework. We calculate the light-front wave functions of pions using an effective light-front Hamiltonian in a basis representation on a current quantum processor. We use the Variational Quantum Eigensolver to find the ground state energy and wave function, which is subsequently used to calculate pion mass radius, decay constant, elastic form factor, and charge radius.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78433924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Consistency testing for robust phase estimation 鲁棒相位估计的一致性测试
arXiv: Quantum Physics Pub Date : 2020-11-26 DOI: 10.1103/PHYSREVA.103.042609
A. Russo, William M. Kirby, K. Rudinger, A. Baczewski, S. Kimmel
{"title":"Consistency testing for robust phase estimation","authors":"A. Russo, William M. Kirby, K. Rudinger, A. Baczewski, S. Kimmel","doi":"10.1103/PHYSREVA.103.042609","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.042609","url":null,"abstract":"We present an extension to the robust phase estimation protocol, which can identify incorrect results that would otherwise lie outside the expected statistical range. Robust phase estimation is increasingly a method of choice for applications such as estimating the effective process parameters of noisy hardware, but its robustness is dependent on the noise satisfying certain threshold assumptions. We provide consistency checks that can indicate when those thresholds have been violated, which can be difficult or impossible to test directly. We test these consistency checks for several common noise models, and identify two possible checks with high accuracy in locating the point in a robust phase estimation run at which further estimates should not be trusted. One of these checks may be chosen based on resource availability, or they can be used together in order to provide additional verification.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78548135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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