Quantum Reports最新文献

Quantum Reports Pub Date : 2024-06-14 DOI: 10.3390/quantum6020019

Larisa Latypova, F. Murzakhanov, G. Mamin, M. Sadovnikova, H. J. von Bardeleben, Marat Gafurov

{"title":"Nitrogen-Related High-Spin Vacancy Defects in Bulk (SiC) and 2D (hBN) Crystals: Comparative Magnetic Resonance (EPR and ENDOR) Study","authors":"Larisa Latypova, F. Murzakhanov, G. Mamin, M. Sadovnikova, H. J. von Bardeleben, Marat Gafurov","doi":"10.3390/quantum6020019","DOIUrl":"https://doi.org/10.3390/quantum6020019","url":null,"abstract":"The distinct spin, optical, and coherence characteristics of solid-state spin defects in semiconductors have positioned them as potential qubits for quantum technologies. Both bulk and two-dimensional materials, with varying structural properties, can serve as crystalline hosts for color centers. In this study, we conduct a comparative analysis of the spin–optical, electron–nuclear, and relaxation properties of nitrogen-bound vacancy defects using electron paramagnetic resonance (EPR) and electron–nuclear double resonance (ENDOR) techniques. We examine key parameters of the spin Hamiltonian for the nitrogen vacancy (NV−) center in 4H-SiC: D = 1.3 GHz, Azz = 1.1 MHz, and CQ = 2.53 MHz, as well as for the boron vacancy (VB−) in hBN: D = 3.6 GHz, Azz = 85 MHz, and CQ = 2.11 MHz, and their dependence on the material matrix. The spin–spin relaxation times T2 (NV− center: 50 µs and VB−: 15 µs) are influenced by the local nuclear environment and spin diffusion while Rabi oscillation damping times depend on crystal size and the spatial distribution of microwave excitation. The ENDOR absorption width varies significantly among color centers due to differences in crystal structures. These findings underscore the importance of selecting an appropriate material platform for developing quantum registers based on high-spin color centers in quantum information systems.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":"21 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141340654","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

Fisher Information for a System Composed of a Combination of Similar Potential Models 类似潜在模型组合系统的费雪信息

Quantum Reports Pub Date : 2024-05-13 DOI: 10.3390/quantum6020015

Clement Atachegbe Onate, Ituen B. Okon, Edwin Samson Eyube, Ekwevugbe Omugbe, Kizito O. Emeje, Michael C. Onyeaju, Olumide O. Ajani, Jacob A. Akinpelu

{"title":"Fisher Information for a System Composed of a Combination of Similar Potential Models","authors":"Clement Atachegbe Onate, Ituen B. Okon, Edwin Samson Eyube, Ekwevugbe Omugbe, Kizito O. Emeje, Michael C. Onyeaju, Olumide O. Ajani, Jacob A. Akinpelu","doi":"10.3390/quantum6020015","DOIUrl":"https://doi.org/10.3390/quantum6020015","url":null,"abstract":"The solutions to the radial Schrödinger equation for a pseudoharmonic potential and Kratzer potential have been studied separately in the past. Despite different reports on the Kratzer potential, the fundamental theoretical quantities such as Fisher information have not been reported. In this study, we obtain the solution to the radial Schrödinger equation for the combination of the pseudoharmonic and Kratzer potentials in the presence of a constant-dependent potential, utilizing the concepts and formalism of the supersymmetric and shape invariance approach. The position expectation value and momentum expectation value are calculated employing the Hellmann–Feynman Theory. These expectation values are then used to calculate the Fisher information for both position and momentum spaces in both the absence and presence of the constant-dependent potential. The results obtained revealed that the presence of the constant-dependent potential leads to an increase in the energy eigenvalue, as well as in the position and momentum expectation values. Additionally, the constant-dependent potential increases the Fisher information for both position and momentum spaces. Furthermore, the product of the position expectation value and the momentum expectation value, along with the product of the Fisher information, satisfies both Fisher’s inequality and Cramer–Rao’s inequality.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140984467","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

A Normalization Condition for the Probability Current in Some Remarkable Cases 一些重要情况下概率电流的归一化条件

Quantum Reports Pub Date : 2024-04-23 DOI: 10.3390/quantum6020012

A. Feoli, E. Benedetto, A. L. Iannella

引用次数: 0

The Many-Worlds Interpretation of Quantum Mechanics: Current Status and Relation to Other Interpretations 量子力学的多世界解释：现状及其与其他诠释的关系

Quantum Reports Pub Date : 2024-04-18 DOI: 10.3390/quantum6020011

L. Vaidman

引用次数: 0

Tomographic Universality of the Discrete Wigner Function 离散维格纳函数的断层普遍性

Quantum Reports Pub Date : 2024-01-19 DOI: 10.3390/quantum6010005

I. Sainz, Ernesto Camacho, Andrés García, Andrei B. Klimov

引用次数: 0

An Ultra-Energy-Efficient Reversible Quantum-Dot Cellular Automata 8:1 Multiplexer Circuit 超节能可逆量子点蜂窝自动机 8:1 多路复用器电路

Quantum Reports Pub Date : 2024-01-16 DOI: 10.3390/quantum6010004

Mohammed Alharbi, Gerard Edwards, Richard Stocker

引用次数: 0

The Rise of Quantum Information and Communication Technologies 量子信息和通信技术的崛起

Quantum Reports Pub Date : 2024-01-11 DOI: 10.3390/quantum6010003

Antonio Manzalini, Luigi Artusio

{"title":"The Rise of Quantum Information and Communication Technologies","authors":"Antonio Manzalini, Luigi Artusio","doi":"10.3390/quantum6010003","DOIUrl":"https://doi.org/10.3390/quantum6010003","url":null,"abstract":"Today, we are already using several-component devices and systems based on the technologies developed during the first quantum revolution. Examples include microchips for servers, laptops and smartphones, medical imaging devices, LED, lasers, etc. Now, a second quantum revolution is progressing fast, exploiting technological advances for the ability to engineer and manipulate other quantum phenomena such as superposition, entanglement and measurement. As a matter of fact, there is an impressive increase in research and development activities, innovation, public and private investments in a new wave of quantum services and applications. In this scenario, quantum information and communication technologies (QICTs) can be defined as a set of technological components, devices, systems and methods for elaborating, storing and transmitting/sharing quantum information. This paper addresses the challenges and opportunities enabling the rise of QICTs. In order to provide a concrete example, the paper describes an overview of the European project EQUO (European Quantum ecOsystems) dealing with ongoing innovation activities in the QICT avenue; in fact, EQUO aims at developing and demonstrating the feasibility of QKD (quantum key distribution) networks and their related integration in current telecommunications infrastructures towards the quantum internet.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":"41 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139533830","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

The Quantum Amplitude Estimation Algorithms on Near-Term Devices: A Practical Guide 近端设备上的量子振幅估算算法：实用指南

Quantum Reports Pub Date : 2023-12-24 DOI: 10.3390/quantum6010001

Marco Maronese, Massimiliano Incudini, Luca Asproni, Enrico Prati

{"title":"The Quantum Amplitude Estimation Algorithms on Near-Term Devices: A Practical Guide","authors":"Marco Maronese, Massimiliano Incudini, Luca Asproni, Enrico Prati","doi":"10.3390/quantum6010001","DOIUrl":"https://doi.org/10.3390/quantum6010001","url":null,"abstract":"The Quantum Amplitude Estimation (QAE) algorithm is a major quantum algorithm designed to achieve a quadratic speed-up. Until fault-tolerant quantum computing is achieved, being competitive over classical Monte Carlo (MC) remains elusive. Alternative methods have been developed so as to require fewer resources while maintaining an advantageous theoretical scaling. We compared the standard QAE algorithm with two Noisy Intermediate-Scale Quantum (NISQ)-friendly versions of QAE on a numerical integration task, with the Monte Carlo technique of Metropolis–Hastings as a classical benchmark. The algorithms were evaluated in terms of the estimation error as a function of the number of samples, computational time, and length of the quantum circuits required by the solutions, respectively. The effectiveness of the two QAE alternatives was tested on an 11-qubit trapped-ion quantum computer in order to verify which solution can first provide a speed-up in the integral estimation problems. We concluded that an alternative approach is preferable with respect to employing the phase estimation routine. Indeed, the Maximum Likelihood estimation guaranteed the best trade-off between the length of the quantum circuits and the precision in the integral estimation, as well as greater resistance to noise.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":"389 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139160870","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

Applications of Supersymmetric Polynomials in Statistical Quantum Physics 超对称多项式在统计量子物理学中的应用

Quantum Reports Pub Date : 2023-12-08 DOI: 10.3390/quantum5040043

I. Chernega, Mariia Martsinkiv, Taras Vasylyshyn, Andriy Zagorodnyuk

引用次数: 0

A Schrödinger Equation for Evolutionary Dynamics 进化动力学的Schrödinger方程

Quantum Reports Pub Date : 2023-10-31 DOI: 10.3390/quantum5040042

Vi D. Ao, Duy V. Tran, Kien T. Pham, Duc M. Nguyen, Huy D. Tran, Tuan K. Do, Van H. Do, Trung V. Phan

{"title":"A Schrödinger Equation for Evolutionary Dynamics","authors":"Vi D. Ao, Duy V. Tran, Kien T. Pham, Duc M. Nguyen, Huy D. Tran, Tuan K. Do, Van H. Do, Trung V. Phan","doi":"10.3390/quantum5040042","DOIUrl":"https://doi.org/10.3390/quantum5040042","url":null,"abstract":"We establish an analogy between the Fokker–Planck equation describing evolutionary landscape dynamics and the Schrödinger equation which characterizes quantum mechanical particles, showing that a population with multiple genetic traits evolves analogously to a wavefunction under a multi-dimensional energy potential in imaginary time. Furthermore, we discover within this analogy that the stationary population distribution on the landscape corresponds exactly to the ground-state wavefunction. This mathematical equivalence grants entry to a wide range of analytical tools developed by the quantum mechanics community, such as the Rayleigh–Ritz variational method and the Rayleigh–Schrödinger perturbation theory, allowing us not only the conduct of reasonable quantitative assessments but also exploration of fundamental biological inquiries. We demonstrate the effectiveness of these tools by estimating the population success on landscapes where precise answers are elusive, and unveiling the ecological consequences of stress-induced mutagenesis—a prevalent evolutionary mechanism in pathogenic and neoplastic systems. We show that, even in an unchanging environment, a sharp mutational burst resulting from stress can always be advantageous, while a gradual increase only enhances population size when the number of relevant evolving traits is limited. Our interdisciplinary approach offers novel insights, opening up new avenues for deeper understanding and predictive capability regarding the complex dynamics of evolving populations.","PeriodicalId":34124,"journal":{"name":"Quantum Reports","volume":"98 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135870557","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