Quantum Science and Technology最新文献_第3页

Generalized quantum Arimoto–Blahut algorithm and its application to quantum information bottleneck 广义量子 Arimoto-Blahut 算法及其在量子信息瓶颈中的应用

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-09-03 DOI: 10.1088/2058-9565/ad6eb1

Masahito Hayashi and Geng Liu

引用次数: 0

Enhancing quantum annealing accuracy through replication-based error mitigation * 通过基于复制的错误缓解提高量子退火的准确性 *

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-09-01 DOI: 10.1088/2058-9565/ad6eb3

Hristo N Djidjev

{"title":"Enhancing quantum annealing accuracy through replication-based error mitigation *","authors":"Hristo N Djidjev","doi":"10.1088/2058-9565/ad6eb3","DOIUrl":"https://doi.org/10.1088/2058-9565/ad6eb3","url":null,"abstract":"Quantum annealers like those manufactured by D-Wave Systems are designed to find high quality solutions to optimization problems that are typically hard for classical computers. They utilize quantum effects like tunneling to evolve toward low-energy states representing solutions to optimization problems. However, their analog nature and limited control functionalities present challenges to correcting or mitigating hardware errors. As quantum computing advances towards applications, effective error suppression is an important research goal. We propose a new approach called replication based mitigation (RBM) based on parallel quantum annealing (QA). In RBM, physical qubits representing the same logical qubit are dispersed across different copies of the problem embedded in the hardware. This mitigates hardware biases, is compatible with limited qubit connectivity in current annealers, and is well-suited for currently available noisy intermediate-scale quantum annealers. Our experimental analysis shows that RBM provides solution quality on par with previous methods while being more flexible and compatible with a wider range of hardware connectivity patterns. In comparisons against standard QA without error mitigation on larger problem instances that could not be handled by previous methods, RBM consistently gets better energies and ground state probabilities across parameterized problem sets.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":null,"pages":null},"PeriodicalIF":6.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142118227","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}

引用次数: 0

Quantum battery supercharging via counter-diabatic dynamics 通过反绝热动力学实现量子电池增压

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-29 DOI: 10.1088/2058-9565/ad71ed

L F C de Moraes, Alan C Duriez, A Saguia, Alan C Santos and M S Sarandy

{"title":"Quantum battery supercharging via counter-diabatic dynamics","authors":"L F C de Moraes, Alan C Duriez, A Saguia, Alan C Santos and M S Sarandy","doi":"10.1088/2058-9565/ad71ed","DOIUrl":"https://doi.org/10.1088/2058-9565/ad71ed","url":null,"abstract":"We introduce a counter-diabatic (CD) approach for deriving Hamiltonians modeling superchargable quantum batteries (QBs). A necessary requirement for the supercharging process is the existence of multipartite interactions among the cells of the battery. Remarkably, this condition may be insufficient no matter the number of multipartite terms in the Hamiltonian. We analytically illustrate this kind of insufficiency through a model of QB based on the adiabatic version for the Grover search problem. On the other hand, we provide QB supercharging with just a mild number of global connections in the system. To this aim, we consider a spin- chain with n sites in the presence of Ising multipartite interactions. We then show that, by considering the validity of the adiabatic approximation and by adding n terms of -site interactions, we can achieve a Hamiltonian exhibiting maximum QB power, with respect to a normalized evolution time, growing quadratically with n. Therefore, supercharging can be achieved by O(n) terms of multipartite connections. The time constraint required by the adiabatic approximation can be surpassed by considering a CD expansion in terms of the gauge potential for the original Hamiltonian, with a limited O(n) many-body interaction terms assured via a Floquet approach for the CD implementation.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":null,"pages":null},"PeriodicalIF":6.7,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100985","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}

引用次数: 0

Synchronization-induced violation of thermodynamic uncertainty relations 同步引起的热力学不确定性关系的违反

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-28 DOI: 10.1088/2058-9565/ad6fc9

Luca Razzoli, Matteo Carrega, Fabio Cavaliere, Giuliano Benenti and Maura Sassetti

引用次数: 0

Hardware requirements for trapped-ion-based verifiable blind quantum computing with a measurement-only client 基于困离子的可验证盲量子计算与纯测量客户端的硬件要求

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-26 DOI: 10.1088/2058-9565/ad6eb2

J van Dam, G Avis, Tz B Propp, F Ferreira da Silva, J A Slater, T E Northup and S Wehner

{"title":"Hardware requirements for trapped-ion-based verifiable blind quantum computing with a measurement-only client","authors":"J van Dam, G Avis, Tz B Propp, F Ferreira da Silva, J A Slater, T E Northup and S Wehner","doi":"10.1088/2058-9565/ad6eb2","DOIUrl":"https://doi.org/10.1088/2058-9565/ad6eb2","url":null,"abstract":"In blind quantum computing (BQC), a user with a simple client device can perform a quantum computation on a remote quantum server such that the server cannot gain knowledge about the computation. Here, we numerically investigate hardware requirements for verifiable BQC using an ion trap as server and a distant measurement-only client. While the client has no direct access to quantum-computing resources, it can remotely execute quantum programs on the server by measuring photons emitted by the trapped ion. We introduce a numerical model for trapped-ion quantum devices in NetSquid, a discrete-event simulator for quantum networks. Using this, we determine the minimal hardware requirements on a per-parameter basis to perform the verifiable BQC protocol. We benchmark these for a five-qubit linear graph state, with which any single-qubit rotation can be performed, where client and server are separated by 50 km. Current state-of-the-art ion traps satisfy the minimal requirements on a per-parameter basis, but all current imperfections combined make it impossible to perform the blind computation securely over 50 km using existing technology. Using a genetic algorithm, we determine the set of hardware parameters that minimises the total improvements required, finding directions along which to improve hardware to reach our threshold error probability that would enable experimental demonstration. In this way, we lay a path for the near-term experimental progress required to realise the implementation of verifiable BQC over a 50 km distance.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":null,"pages":null},"PeriodicalIF":6.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084821","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}

引用次数: 0

Individually tunable tunnelling coefficients in optical lattices using local periodic driving 利用局部周期性驱动在光晶格中实现可单独调谐的隧道系数

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-26 DOI: 10.1088/2058-9565/ad69bb

Georgia M Nixon, F Nur Ünal and Ulrich Schneider

{"title":"Individually tunable tunnelling coefficients in optical lattices using local periodic driving","authors":"Georgia M Nixon, F Nur Ünal and Ulrich Schneider","doi":"10.1088/2058-9565/ad69bb","DOIUrl":"https://doi.org/10.1088/2058-9565/ad69bb","url":null,"abstract":"Ultracold atoms in optical lattices have emerged as powerful quantum simulators of translationally invariant systems with many applications in e.g. strongly-correlated and topological systems. However, the ability to locally tune all Hamiltonian parameters remains an outstanding goal that would enable the simulation of a wider range of quantum phenomena. Motivated by recent advances in quantum gas microscopes and optical tweezers, we here show theoretically how local control over individual tunnelling links in an optical lattice can be achieved by incorporating local time-periodic potentials. We propose to periodically modulate the on-site energy of individual lattice sites and employ Floquet theory to demonstrate how this provides full individual control over the tunnelling amplitudes in one dimension. We provide various example configurations realising interesting topological models such as extended Su–Schrieffer–Heeger models that would be challenging to realise by other means. Extending to two dimensions, we demonstrate that local periodic driving in a Lieb lattice engineers a two-dimensional (2D) network with fully controllable tunnelling magnitudes. In a three-site plaquette, we show full simultaneous control over the relative tunnelling amplitudes and the gauge-invariant flux piercing the plaquette, providing a clear stepping stone to building a fully programmable 2D tight-binding model. We also explicitly demonstrate how utilise our technique to generate a magnetic field gradient in 2D. This local modulation scheme is applicable to many different lattice geometries.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":null,"pages":null},"PeriodicalIF":6.7,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084819","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}

引用次数: 0

Thermodynamic sensing of quantum nonlinear noise correlations 量子非线性噪声相关性的热力学传感

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-21 DOI: 10.1088/2058-9565/ad6eb4

Nilakantha Meher, Tomáš Opatrný and Gershon Kurizki

引用次数: 0

Photonic variational quantum eigensolver using entanglement measurements 利用纠缠测量的光子变分量子求解器

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-20 DOI: 10.1088/2058-9565/ad6d87

Jinil Lee, Wooyeong Song, Donghwa Lee, Yosep Kim, Seung-Woo Lee, Hyang-Tag Lim, Hojoong Jung, Sang-Wook Han and Yong-Su Kim

引用次数: 0

Entanglement-preserving measurement of the Bell parameter on a single entangled pair 对单个纠缠对的贝尔参数进行纠缠保全测量

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-19 DOI: 10.1088/2058-9565/ad6a37

Salvatore Virzì, Enrico Rebufello, Francesco Atzori, Alessio Avella, Fabrizio Piacentini, Rudi Lussana, Iris Cusini, Francesca Madonini, Federica Villa, Marco Gramegna, Eliahu Cohen, Ivo Pietro Degiovanni and Marco Genovese

{"title":"Entanglement-preserving measurement of the Bell parameter on a single entangled pair","authors":"Salvatore Virzì, Enrico Rebufello, Francesco Atzori, Alessio Avella, Fabrizio Piacentini, Rudi Lussana, Iris Cusini, Francesca Madonini, Federica Villa, Marco Gramegna, Eliahu Cohen, Ivo Pietro Degiovanni and Marco Genovese","doi":"10.1088/2058-9565/ad6a37","DOIUrl":"https://doi.org/10.1088/2058-9565/ad6a37","url":null,"abstract":"Bell inequalities represent one of the cornerstones of quantum foundations, and a fundamental tool for quantum technologies. Although a lot of effort was put in exploring and generalizing them, because of the wave function collapse it was deemed impossible to estimate the entire Bell parameter from one entangled pair, since this would involve measuring incompatible observables on the same quantum state. Conversely, here it is reported the first implementation of a new generation of Bell inequality tests, able to extract a Bell parameter value from each entangled pair and, at the same time, preserve the pair entanglement instead of destroying it. This is obtained by exploiting sequences of weak measurements, allowing incompatible observable measurements on a quantum state without collapsing its wave function. On the fundamental side, by removing the need to choose between different measurement bases our approach stretches the concept of counterfactual definiteness, since it allows measuring the entangled pair in all the bases needed for the Bell inequality test, intrinsically eliminating the issues connected with the otherwise not-chosen bases. On the practical side, after our Bell parameter measurement the entanglement within the pair remains (basically) unaltered, hence exploitable for other quantum-technology-related or foundational purposes.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":null,"pages":null},"PeriodicalIF":6.7,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007541","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}

引用次数: 0

A differentiable quantum phase estimation algorithm 可变量子相位估计算法

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-08-12 DOI: 10.1088/2058-9565/ad69bc

Davide Castaldo, Soran Jahangiri, Agostino Migliore, Juan Miguel Arrazola and Stefano Corni

引用次数: 0