Quantum Reports最新文献_第7页

Model-Free Deep Recurrent Q-Network Reinforcement Learning for Quantum Circuit Architectures Design 用于量子电路结构设计的无模型深度递归Q网络强化学习

Quantum Reports Pub Date : 2022-09-21 DOI: 10.3390/quantum4040027

T. Sogabe, Tomoaki Kimura, Chih-Chieh Chen, Kodai Shiba, Nobuhiro Kasahara, Masaru Sogabe, K. Sakamoto

{"title":"Model-Free Deep Recurrent Q-Network Reinforcement Learning for Quantum Circuit Architectures Design","authors":"T. Sogabe, Tomoaki Kimura, Chih-Chieh Chen, Kodai Shiba, Nobuhiro Kasahara, Masaru Sogabe, K. Sakamoto","doi":"10.3390/quantum4040027","DOIUrl":"https://doi.org/10.3390/quantum4040027","url":null,"abstract":"Artificial intelligence (AI) technology leads to new insights into the manipulation of quantum systems in the Noisy Intermediate-Scale Quantum (NISQ) era. Classical agent-based artificial intelligence algorithms provide a framework for the design or control of quantum systems. Traditional reinforcement learning methods are designed for the Markov Decision Process (MDP) and, hence, have difficulty in dealing with partially observable or quantum observable decision processes. Due to the difficulty of building or inferring a model of a specified quantum system, a model-free-based control approach is more practical and feasible than its counterpart of a model-based approach. In this work, we apply a model-free deep recurrent Q-network (DRQN) reinforcement learning method for qubit-based quantum circuit architecture design problems. This paper is the first attempt to solve the quantum circuit design problem from the recurrent reinforcement learning algorithm, while using discrete policy. Simulation results suggest that our long short-term memory (LSTM)-based DRQN method is able to learn quantum circuits for entangled Bell–Greenberger–Horne–Zeilinger (Bell–GHZ) states. However, since we also observe unstable learning curves in experiments, suggesting that the DRQN could be a promising method for AI-based quantum circuit design application, more investigation on the stability issue would be required.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47178727","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

Cyclic Six-Atomic Boron-Nitrides: Quantum-Chemical Consideration by Ab Initio CCSD(T) Method 循环六原子氮化硼：Ab Initio CCSD（T）方法的量子化学思考

Quantum Reports Pub Date : 2022-09-16 DOI: 10.3390/quantum4030025

D. Chachkov, O. Mikhailov

引用次数: 0

Simultaneity and Time Reversal in Quantum Mechanics in Relation to Proper Time 量子力学中与固有时相关的同时性和时间反转

Quantum Reports Pub Date : 2022-09-08 DOI: 10.3390/quantum4030023

S. Yasmineh

引用次数: 0

An Overview of Basis Set Effects for Diatomic Boron Nitride Compounds (B2N(∓,0)): A Quantum Symmetry Breaking 双原子氮化硼化合物（B2N（∓，0））的基集效应综述：量子对称性破缺

Quantum Reports Pub Date : 2022-09-08 DOI: 10.3390/quantum4030024

M. Monajjemi, Fatemeh Mollaamin, Neda Samiei Soofi

{"title":"An Overview of Basis Set Effects for Diatomic Boron Nitride Compounds (B2N(∓,0)): A Quantum Symmetry Breaking","authors":"M. Monajjemi, Fatemeh Mollaamin, Neda Samiei Soofi","doi":"10.3390/quantum4030024","DOIUrl":"https://doi.org/10.3390/quantum4030024","url":null,"abstract":"The symmetry breaking (SB) of B2 not only exhibits an energy barrier for ionic or neutral forms dependent on various basis sets but it also exhibits a few SBs due to the asymmetry stretching and bending mode interactions. SB obeys the mechanical quantum theorem among discrete symmetries and their connection to the spin statistics in physical sciences. In this investigation, the unusual amount of energy barrier of SBs appeared upon the orbit–orbit coupling of BNB (both radical and ions) between transition states and the ground state. Our goal in this study is to understand the difference among the electromagnetic structures of the (B2N(∓,0)) variants due to effects of various basis sets and methods and also the quantum symmetry breaking phenomenon. In the D∞h point group of (B2N(∓,0)) variants, the unpaired electron is delocalized, while in the asymmetric C∞v point group, it is localized on either one of the B atoms. Structures with broken symmetry, C∞v, can be stable by interacting with the D∞h point group. In viewpoints of quantum chemistry, the second-order Jahn–Teller effect permits the unpaired electron to localize on boron atom, rather than being delocalized. In this study, we observed that the energy barrier of SB for BNB increases by post HF methods.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47207295","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: 1

Simple and Rigorous Proof Method for the Security of Practical Quantum Key Distribution in the Single-Qubit Regime Using Mismatched Basis Measurements 基于不匹配基测量的单量子位实际量子密钥分发安全性的简单严格证明方法

Quantum Reports Pub Date : 2022-08-29 DOI: 10.3390/quantum5010005

Michel Boyer, G. Brassard, N. Godbout, R. Liss, S. Virally

引用次数: 1

Kupczynski’s Contextual Locally Causal Probabilistic Models Are Constrained by Bell’s Theorem Kupczynski上下文局部因果概率模型受Bell定理约束

Quantum Reports Pub Date : 2022-08-21 DOI: 10.3390/quantum5020032

Richard D. Gill, J. P. Lambare

引用次数: 3

Integral Quantization for the Discrete Cylinder 离散圆柱的积分量化

Quantum Reports Pub Date : 2022-08-19 DOI: 10.3390/quantum4040026

J. Gazeau, R. Murenzi

{"title":"Integral Quantization for the Discrete Cylinder","authors":"J. Gazeau, R. Murenzi","doi":"10.3390/quantum4040026","DOIUrl":"https://doi.org/10.3390/quantum4040026","url":null,"abstract":"Covariant integral quantizations are based on the resolution of the identity by continuous or discrete families of normalized positive operator valued measures (POVM), which have appealing probabilistic content and which transform in a covariant way. One of their advantages is their ability to circumvent problems due to the presence of singularities in the classical models. In this paper, we implement covariant integral quantizations for systems whose phase space is Z×S1, i.e., for systems moving on the circle. The symmetry group of this phase space is the discrete & compact version of the Weyl–Heisenberg group, namely the central extension of the abelian group Z×SO(2). In this regard, the phase space is viewed as the right coset of the group with its center. The non-trivial unitary irreducible representation of this group, as acting on L2(S1), is square integrable on the phase space. We show how to derive corresponding covariant integral quantizations from (weight) functions on the phase space and resulting resolution of the identity. As particular cases of the latter we recover quantizations with de Bièvre-del Olmo–Gonzales and Kowalski–Rembielevski–Papaloucas coherent states on the circle. Another straightforward outcome of our approach is the Mukunda Wigner transform. We also look at the specific cases of coherent states built from shifted gaussians, Von Mises, Poisson, and Fejér kernels. Applications to stellar representations are in progress.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43216339","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

The Laplace Method for Energy Eigenvalue Problems in Quantum Mechanics 量子力学中能量本征值问题的拉普拉斯方法

Quantum Reports Pub Date : 2022-08-15 DOI: 10.3390/quantum5020024

J. Canfield, A. Galler, J. Freericks

引用次数: 0

Schrödinger Equation with Geometric Constraints and Position-Dependent Mass: Linked Fractional Calculus Models 具有几何约束和位置相关质量的Schrödinger方程：连接分数微积分模型

Quantum Reports Pub Date : 2022-08-14 DOI: 10.3390/quantum4030021

E. Lenzi, L. R. Evangelista, H. V. Ribeiro, R. Magin

引用次数: 2

Electromagnetic Signatures of Possible Charge Anomalies in Tunneling 隧道施工中可能电荷异常的电磁特征

Quantum Reports Pub Date : 2022-08-11 DOI: 10.3390/quantum4030020

F. Minotti, G. Modanese

{"title":"Electromagnetic Signatures of Possible Charge Anomalies in Tunneling","authors":"F. Minotti, G. Modanese","doi":"10.3390/quantum4030020","DOIUrl":"https://doi.org/10.3390/quantum4030020","url":null,"abstract":"We reconsider some well-known tunneling processes from the point of view of Aharonov-Bohm electrodynamics, a unique extension of Maxwell’s theory which admits charge-current sources that are not locally conserved. In particular we are interested into tunneling phenomena having relatively long range (otherwise the non-Maxwellian effects become irrelevant, especially at high frequency) and involving macroscopic wavefunctions and coherent matter, for which it makes sense to evaluate the classical e.m. field generated by the tunneling particles. For some condensed-matter systems, admitting discontinuities in the probability current is a possible way of formulating phenomenological models. In such cases, the Aharonov-Bohm theory offers a logically consistent approach and allows to derive observable consequences. Typical e.m. signatures of the failure of local conservation are at high frequency the generation of a longitudinal electric radiation field, and at low frequency a small effect of “missing” magnetic field. Possible causes of this failure are instant tunneling and phase slips in superconductors. For macroscopic quantum systems in which the phase-number uncertainty relation ΔNΔφ∼1 applies, the expectation value of the anomalous source I=∂tρ+∇·j has quantum fluctuations, thus becoming a random source of weak non-Maxwellian fields.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46043478","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: 1