Pub Date : 2024-09-06DOI: 10.1103/physreva.110.032406
Ming-jie Liao, Mei-Song Wei, Yi-Qing Wang, Jingping Xu, Yaping Yang
We demonstrate a controllable and tunable topological beam splitter with a multiport based on the one-dimensional extended Su-Schrieffer-Heeger model, which supports the topological interface by introducing the nearest-neighbor (NN) coupling defect at the central site. The quantum state initially prepared at the interface can be transmitted with high fidelity to multiple output ports with equal or unequal probability on both sides of the model by modulating the NN coupling between the sites in the time domain. We show that the output port can be added by increasing the number of sublattices . Especially, by setting the on-site potential energy, we can easily control the direction of the quantum state transfer process and ensure that this state is only transmitted to the multiple output ports on the left or multiple output ports on the right, which realizes the function of topological switching. Benefiting from the topological protection of the edge states, the quantum states can be transmitted with high fidelity even if there is the NN coupling disorder. Our work realizes a robust and multifunctional topological beam splitter.
我们展示了一种基于一维扩展 Su-Schrieffer-Heeger 模型的可控可调拓扑多端口分光器，该模型通过在中心位点引入最近邻（NN）耦合缺陷来支持拓扑界面。通过在时域中调制位点间的 NN 耦合，最初在界面上制备的量子态可以高保真地传输到模型两侧概率相等或不相等的多个输出端口。我们的研究表明，可以通过增加子晶格数 a 来增加输出端口。特别是，通过设置位点势能，我们可以方便地控制量子态转移过程的方向，确保该态只传输到左边的多个输出端口或右边的多个输出端口，实现拓扑切换的功能。得益于边缘态的拓扑保护，即使存在 NN 耦合紊乱，量子态也能高保真地传输。我们的工作实现了一种坚固耐用的多功能拓扑分光器。
{"title":"Controllable and tunable topological multiport beam splitter in an extended Su-Schrieffer-Heeger array","authors":"Ming-jie Liao, Mei-Song Wei, Yi-Qing Wang, Jingping Xu, Yaping Yang","doi":"10.1103/physreva.110.032406","DOIUrl":"https://doi.org/10.1103/physreva.110.032406","url":null,"abstract":"We demonstrate a controllable and tunable topological beam splitter with a multiport based on the one-dimensional extended Su-Schrieffer-Heeger model, which supports the topological interface by introducing the nearest-neighbor (NN) coupling defect at the central site. The quantum state initially prepared at the interface can be transmitted with high fidelity to multiple output ports with equal or unequal probability on both sides of the model by modulating the NN coupling between the sites in the time domain. We show that the output port can be added by increasing the number of sublattices <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>a</mi></math>. Especially, by setting the on-site potential energy, we can easily control the direction of the quantum state transfer process and ensure that this state is only transmitted to the multiple output ports on the left or multiple output ports on the right, which realizes the function of topological switching. Benefiting from the topological protection of the edge states, the quantum states can be transmitted with high fidelity even if there is the NN coupling disorder. Our work realizes a robust and multifunctional topological beam splitter.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"5 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.032804
Krzysztof Pachucki, Vladimir A. Yerokhin
The quantum electrodynamic formalism is presented for the systematic and exact in derivation of nuclear recoil corrections in hydrogenic systems.
提出了量子电动力学形式主义，用于在 Zα 内系统而精确地推导含氢系统的核反冲修正。
{"title":"Heavy-particle quantum electrodynamics","authors":"Krzysztof Pachucki, Vladimir A. Yerokhin","doi":"10.1103/physreva.110.032804","DOIUrl":"https://doi.org/10.1103/physreva.110.032804","url":null,"abstract":"The quantum electrodynamic formalism is presented for the systematic and exact in <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>Z</mi><mspace width=\"0.16em\"></mspace><mi>α</mi></mrow></math> derivation of nuclear recoil corrections in hydrogenic systems.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"1 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.032803
C. Wang, Y. Lu, S. K. Kanungo, F. B. Dunning, T. C. Killian, S. Yoshida
Spectroscopic measurements of the rotational distribution of and ultralong-range Rydberg molecular dimers created via photoassociation in a cold gas are reported. The dimers are produced by two-photon excitation via the intermediate state. The use of singlet states permits detailed study of the roles that the initial atom-atom interaction, photon momentum transfer during Rydberg excitation, and sample temperature play in determining the spectral line shape and final dimer rotational distribution. The results are in good agreement with the predictions of a model that includes these effects. The present work further highlights the sensitivity of ultralong-range Rydberg molecule formation to the state of the initial cold gas.
{"title":"Elucidating the roles of collision energy and photon momentum transfer in the formation of ultralong-range Rydberg molecules","authors":"C. Wang, Y. Lu, S. K. Kanungo, F. B. Dunning, T. C. Killian, S. Yoshida","doi":"10.1103/physreva.110.032803","DOIUrl":"https://doi.org/10.1103/physreva.110.032803","url":null,"abstract":"Spectroscopic measurements of the rotational distribution of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Sr</mi><mprescripts></mprescripts><none></none><mn>84</mn></mmultiscripts></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mmultiscripts><mi>Sr</mi><mprescripts></mprescripts><none></none><mn>86</mn></mmultiscripts><mspace width=\"4pt\"></mspace><mspace width=\"0.16em\"></mspace><mn>5</mn><mi>s</mi><mi>n</mi><mi>s</mi><msup><mrow><mspace width=\"0.16em\"></mspace></mrow><mn>1</mn></msup><msub><mi>S</mi><mn>0</mn></msub></mrow></math> ultralong-range Rydberg molecular dimers created via photoassociation in a cold gas are reported. The dimers are produced by two-photon excitation via the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>5</mn><mi>s</mi><mn>5</mn><mi>p</mi></mrow></math> <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>P</mi><mn>1</mn><none></none><mprescripts></mprescripts><none></none><mn>1</mn></mmultiscripts></math> intermediate state. The use of singlet states permits detailed study of the roles that the initial atom-atom interaction, photon momentum transfer during Rydberg excitation, and sample temperature play in determining the spectral line shape and final dimer rotational distribution. The results are in good agreement with the predictions of a model that includes these effects. The present work further highlights the sensitivity of ultralong-range Rydberg molecule formation to the state of the initial cold gas.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"57 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.032206
Bhilahari Jeevanesan
Given the recent advances in quantum technology, the complexity of quantum states is an important notion. The idea of the Krylov spread complexity has come into focus recently with the goal of capturing this in a quantitative way. The present paper sheds light on the Krylov complexity measure by exploring it in the context of continuous-time quantum walks on graphs. A close relationship between Krylov spread complexity and the concept of limiting distributions for quantum walks is established. Moreover, using a graph optimization algorithm, quantum-walk graphs are constructed that have vertex states with minimal and maximal (long-time average) Krylov complexity. This reveals an empirical upper bound for the complexity as a function of Hilbert-space dimension and an exact lower bound.
{"title":"Krylov spread complexity of quantum walks","authors":"Bhilahari Jeevanesan","doi":"10.1103/physreva.110.032206","DOIUrl":"https://doi.org/10.1103/physreva.110.032206","url":null,"abstract":"Given the recent advances in quantum technology, the complexity of quantum states is an important notion. The idea of the <i>Krylov spread complexity</i> has come into focus recently with the goal of capturing this in a quantitative way. The present paper sheds light on the Krylov complexity measure by exploring it in the context of continuous-time quantum walks on graphs. A close relationship between Krylov spread complexity and the concept of <i>limiting distributions</i> for quantum walks is established. Moreover, using a graph optimization algorithm, quantum-walk graphs are constructed that have vertex states with minimal and maximal (long-time average) Krylov <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mover accent=\"true\"><mi mathvariant=\"script\">C</mi><mo>¯</mo></mover></math> complexity. This reveals an empirical upper bound for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mover accent=\"true\"><mi mathvariant=\"script\">C</mi><mo>¯</mo></mover></math> complexity as a function of Hilbert-space dimension and an exact lower bound.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"15 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.033512
M. Kolesik
The propagation effects reshaping the excitation pulse are known to exhibit a strong influence on the high-harmonic generation (HHG) in solid-state media. Previous measurements showed that the midinfrared pulse dynamics, most importantly the nonlinear loss and spectral broadening, can dampen or even extinguish the highest harmonic peaks. Despite the importance of these effects, their inclusion in the HHG modeling has been so far restricted to one-dimensional propagation and/or very thin samples. This work demonstrates an approach where the driving pulse is simulated with a full spatial and temporal resolution in samples of realistic thickness while the material interfaces are included as well. We show that the HHG spectrum measured in the transmission geometry is greatly affected by the Fresnel reflections causing interference in the vicinity of the material surface, and we find that different parts of the harmonic spectra originate from different regions of the material sample. Our results underline the importance of realistic and comprehensive simulations in the interpretation of high-harmonic generation from solids in the transmission geometry.
{"title":"Propagation and material-interface effects in the higher-order harmonic radiation from solid-state samples","authors":"M. Kolesik","doi":"10.1103/physreva.110.033512","DOIUrl":"https://doi.org/10.1103/physreva.110.033512","url":null,"abstract":"The propagation effects reshaping the excitation pulse are known to exhibit a strong influence on the high-harmonic generation (HHG) in solid-state media. Previous measurements showed that the midinfrared pulse dynamics, most importantly the nonlinear loss and spectral broadening, can dampen or even extinguish the highest harmonic peaks. Despite the importance of these effects, their inclusion in the HHG modeling has been so far restricted to one-dimensional propagation and/or very thin samples. This work demonstrates an approach where the driving pulse is simulated with a full spatial and temporal resolution in samples of realistic thickness while the material interfaces are included as well. We show that the HHG spectrum measured in the transmission geometry is greatly affected by the Fresnel reflections causing interference in the vicinity of the material surface, and we find that different parts of the harmonic spectra originate from different regions of the material sample. Our results underline the importance of realistic and comprehensive simulations in the interpretation of high-harmonic generation from solids in the transmission geometry.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"6 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.032607
Leonardo K. Castelano, Iann Cunha, Fabricio S. Luiz, Reginaldo de Jesus Napolitano, Marcelo V. de Souza Prado, Felipe F. Fanchini
The precision required to characterize a Hamiltonian is central to developing advantageous quantum computers, providing powerful advances in quantum sensing and crosstalk mitigation. Traditional methods to determine a Hamiltonian are difficult due to the intricacies of quantum systems, involving numbers of equations and parameters that grow exponentially with the number of qubits. To mitigate these shortcomings, in this paper, we introduce an innovative and effective procedure integrating a physics-informed neural network (PINN) with a freezing mechanism to learn the Hamiltonian parameters efficiently. Although PINN and experimental data alone would become impractical as increases, the mechanism we introduce freezes the interactions of most of the qubits, leaving just a qubit subsystem to be analyzed by the PINN method. Determination of all physical parameters is accomplished by analyzing the system by parts until completion. We validated the efficacy of our method using simulation data obtained from the IBM quantum computer to obtain the training data and we found that a PINN can learn the two-qubit parameters with high accuracy, achieving a median error of less than for systems of up to four qubits. We have successfully combined the PINN analysis of two qubits with the freezing mechanism in the case of a four-qubit system.
表征哈密顿方程所需的精度是开发优势量子计算机的核心，可为量子传感和串扰缓解带来强大的进步。由于量子系统错综复杂，涉及的方程和参数数量随量子比特数量呈指数增长，因此确定哈密顿的传统方法非常困难。为了缓解这些缺陷，我们在本文中介绍了一种创新而有效的程序，它将物理信息神经网络（PINN）与冻结机制整合在一起，从而高效地学习哈密顿参数。虽然随着 N 的增加，仅靠 PINN 和实验数据将变得不切实际，但我们引入的机制冻结了大部分量子比特的相互作用，只留下一个量子比特子系统供 PINN 方法分析。所有物理参数的确定都是通过分析系统的各个部分完成的。我们利用从 IBM 量子计算机获得的模拟数据来获取训练数据，验证了我们方法的有效性，我们发现 PINN 可以高精度地学习双量子比特参数，对于多达四个量子比特的系统，中位误差小于 0.1%。在四量子比特系统中，我们成功地将双量子比特的 PINN 分析与冻结机制结合起来。
{"title":"Combining physics-informed neural networks with the freezing mechanism for general Hamiltonian learning","authors":"Leonardo K. Castelano, Iann Cunha, Fabricio S. Luiz, Reginaldo de Jesus Napolitano, Marcelo V. de Souza Prado, Felipe F. Fanchini","doi":"10.1103/physreva.110.032607","DOIUrl":"https://doi.org/10.1103/physreva.110.032607","url":null,"abstract":"The precision required to characterize a Hamiltonian is central to developing advantageous quantum computers, providing powerful advances in quantum sensing and crosstalk mitigation. Traditional methods to determine a Hamiltonian are difficult due to the intricacies of quantum systems, involving numbers of equations and parameters that grow exponentially with the number of qubits. To mitigate these shortcomings, in this paper, we introduce an innovative and effective procedure integrating a physics-informed neural network (PINN) with a freezing mechanism to learn the Hamiltonian parameters efficiently. Although PINN and experimental data alone would become impractical as <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>N</mi></math> increases, the mechanism we introduce freezes the interactions of most of the qubits, leaving just a qubit subsystem to be analyzed by the PINN method. Determination of all physical parameters is accomplished by analyzing the system by parts until completion. We validated the efficacy of our method using simulation data obtained from the IBM quantum computer to obtain the training data and we found that a PINN can learn the two-qubit parameters with high accuracy, achieving a median error of less than <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>0.1</mn><mo>%</mo></mrow></math> for systems of up to four qubits. We have successfully combined the PINN analysis of two qubits with the freezing mechanism in the case of a four-qubit system.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"10 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.032205
Abel Rojo-Francàs, Felipe Isaule, Alan C. Santos, Bruno Juliá-Díaz, Nikolaj Thomas Zinner
We propose a quantum battery realized with a few interacting particles in a three-well system with different on-site energies, which could be realized with ultracold-atom platforms. We prepare the initial state in the lowest-energy well and charge the battery using a spatial-adiabatic-passage–based protocol, enabling the population of a higher-energy well. We examine the charging under varying interaction strengths and reveal that the consideration of collective charging results in an intriguing oscillatory behavior of the final charge for finite interactions, through diabatic evolution. Our findings provide an opportunity for building stable and controllable quantum batteries.
{"title":"Stable collective charging of ultracold-atom quantum batteries","authors":"Abel Rojo-Francàs, Felipe Isaule, Alan C. Santos, Bruno Juliá-Díaz, Nikolaj Thomas Zinner","doi":"10.1103/physreva.110.032205","DOIUrl":"https://doi.org/10.1103/physreva.110.032205","url":null,"abstract":"We propose a quantum battery realized with a few interacting particles in a three-well system with different on-site energies, which could be realized with ultracold-atom platforms. We prepare the initial state in the lowest-energy well and charge the battery using a spatial-adiabatic-passage–based protocol, enabling the population of a higher-energy well. We examine the charging under varying interaction strengths and reveal that the consideration of collective charging results in an intriguing oscillatory behavior of the final charge for finite interactions, through diabatic evolution. Our findings provide an opportunity for building stable and controllable quantum batteries.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"328 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-06DOI: 10.1103/physreva.110.032608
Seyed Mohammad Hosseiny, Jamileh Seyed-Yazdi, Milad Norouzi
Many quantum systems display Markovian and non-Markovian behaviors with the information flow and backflow between the system and the surrounding environment. In this paper, we introduce a definition of the dynamics of open quantum systems called information trapping, which is a special case of the information flow. We show that under specific conditions, the information flow can exhibit behavior beyond Markovian or non-Markovian system dynamics. The physical reason behind this phenomenon may arise from the entanglement between the system and the environment, such that the rates of entangling and disentangling can equalize over time, influenced by the quantum memory of the system and environmental decoherence effects. This proposal is investigated by considering some witnesses of the behavior of the system dynamics such as fidelity, trace distance, the Holevo quantity, and Hilbert-Schmidt speed in the quantum teleportation and dense coding protocols based on the open quantum system consisting of an chain Heisenberg affected by intrinsic decoherence. The main achievement of this work is focused on facilitating access to faithful quantum communication.
{"title":"Information trapping in quantum communications","authors":"Seyed Mohammad Hosseiny, Jamileh Seyed-Yazdi, Milad Norouzi","doi":"10.1103/physreva.110.032608","DOIUrl":"https://doi.org/10.1103/physreva.110.032608","url":null,"abstract":"Many quantum systems display Markovian and non-Markovian behaviors with the information flow and backflow between the system and the surrounding environment. In this paper, we introduce a definition of the dynamics of open quantum systems called information trapping, which is a special case of the information flow. We show that under specific conditions, the information flow can exhibit behavior beyond Markovian or non-Markovian system dynamics. The physical reason behind this phenomenon may arise from the entanglement between the system and the environment, such that the rates of entangling and disentangling can equalize over time, influenced by the quantum memory of the system and environmental decoherence effects. This proposal is investigated by considering some witnesses of the behavior of the system dynamics such as fidelity, trace distance, the Holevo quantity, and Hilbert-Schmidt speed in the quantum teleportation and dense coding protocols based on the open quantum system consisting of an <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>X</mi><mi>X</mi><mi>Z</mi></mrow></math> chain Heisenberg affected by intrinsic decoherence. The main achievement of this work is focused on facilitating access to faithful quantum communication.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"3 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-05DOI: 10.1103/physreva.110.032606
Jack S. Baker, Pablo A. M. Casares, Modjtaba Shokrian Zini, Jaydeep Thik, Debasish Banerjee, Chen Ling, Alain Delgado, Juan Miguel Arrazola
There is a pressing need for more accurate computational simulations of the optoelectronic properties of defects in materials to aid in the development of quantum sensing platforms. In this work, we explore how quantum computers could be effectively utilized for this purpose. Specifically, we develop fault-tolerant quantum algorithms to simulate optically active defect states and their radiative emission rates. We employ quantum defect embedding theory to translate the Hamiltonian of a defect-containing supercell into a smaller, effective Hamiltonian that accounts for dielectric screening effects. Our approach integrates block-encoding of the dipole operator with quantum phase estimation to selectively sample the optically active excited states that exhibit the largest dipole transition amplitudes. We also provide estimates of the quantum resources required to simulate a negatively charged boron vacancy in a hexagonal boron nitride cluster. We conclude by offering a forward-looking perspective on the potential of quantum computers to enhance quantum sensor capabilities and identify specific scenarios where quantum computing can resolve problems traditionally challenging for classical computers.
{"title":"Simulating optically active spin defects with a quantum computer","authors":"Jack S. Baker, Pablo A. M. Casares, Modjtaba Shokrian Zini, Jaydeep Thik, Debasish Banerjee, Chen Ling, Alain Delgado, Juan Miguel Arrazola","doi":"10.1103/physreva.110.032606","DOIUrl":"https://doi.org/10.1103/physreva.110.032606","url":null,"abstract":"There is a pressing need for more accurate computational simulations of the optoelectronic properties of defects in materials to aid in the development of quantum sensing platforms. In this work, we explore how quantum computers could be effectively utilized for this purpose. Specifically, we develop fault-tolerant quantum algorithms to simulate optically active defect states and their radiative emission rates. We employ quantum defect embedding theory to translate the Hamiltonian of a defect-containing supercell into a smaller, effective Hamiltonian that accounts for dielectric screening effects. Our approach integrates block-encoding of the dipole operator with quantum phase estimation to selectively sample the optically active excited states that exhibit the largest dipole transition amplitudes. We also provide estimates of the quantum resources required to simulate a negatively charged boron vacancy in a hexagonal boron nitride cluster. We conclude by offering a forward-looking perspective on the potential of quantum computers to enhance quantum sensor capabilities and identify specific scenarios where quantum computing can resolve problems traditionally challenging for classical computers.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"45 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-09-05DOI: 10.1103/physreva.110.032405
Xi Lu, Wojciech Górecki, Chiara Macchiavello, Lorenzo Maccone
We give two upper bounds to the mutual information in arbitrary quantum estimation strategies. The first is based on some simple Fourier properties of the estimation apparatus. The second is derived using the first, but, interestingly, depends only on the Fisher information of the parameter, so it is valid even beyond quantum estimation. We illustrate the usefulness of these bounds by characterizing the quantum phase estimation algorithm in the presence of noise. In addition, for the noiseless case, we extend the analysis beyond applying the bound and we discuss the optimal entangled and adaptive strategies, clarifying inaccuracies appearing on this topic in the literature.
{"title":"Number of bits returned by a quantum estimation","authors":"Xi Lu, Wojciech Górecki, Chiara Macchiavello, Lorenzo Maccone","doi":"10.1103/physreva.110.032405","DOIUrl":"https://doi.org/10.1103/physreva.110.032405","url":null,"abstract":"We give two upper bounds to the mutual information in arbitrary quantum estimation strategies. The first is based on some simple Fourier properties of the estimation apparatus. The second is derived using the first, but, interestingly, depends only on the Fisher information of the parameter, so it is valid even beyond quantum estimation. We illustrate the usefulness of these bounds by characterizing the quantum phase estimation algorithm in the presence of noise. In addition, for the noiseless case, we extend the analysis beyond applying the bound and we discuss the optimal entangled and adaptive strategies, clarifying inaccuracies appearing on this topic in the literature.","PeriodicalId":20146,"journal":{"name":"Physical Review A","volume":"1 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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