Quantum最新文献_第6页

Witnessing mass-energy equivalence with trapped atom interferometers 用俘获原子干涉仪见证质能等效

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-08-08 DOI: 10.22331/q-2025-08-08-1827

Jerzy Paczos, Joshua Foo, Magdalena Zych

引用次数: 0

Nonlinear Spectroscopy via Generalized Quantum Phase Estimation 广义量子相位估计的非线性光谱学

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-08-07 DOI: 10.22331/q-2025-08-07-1822

Ignacio Loaiza, Danial Motlagh, Kasra Hejazi, Modjtaba Shokrian Zini, Alain Delgado, Juan Miguel Arrazola

{"title":"Nonlinear Spectroscopy via Generalized Quantum Phase Estimation","authors":"Ignacio Loaiza, Danial Motlagh, Kasra Hejazi, Modjtaba Shokrian Zini, Alain Delgado, Juan Miguel Arrazola","doi":"10.22331/q-2025-08-07-1822","DOIUrl":"https://doi.org/10.22331/q-2025-08-07-1822","url":null,"abstract":"Response theory has a successful history of connecting experimental observations with theoretical predictions. Of particular interest is the optical response of matter, from which spectroscopy experiments can be modelled. However, the calculation of response properties for quantum systems is often prohibitively expensive, especially for nonlinear spectroscopy, as it requires access to either the time evolution of the system or to excited states. In this work, we introduce a generalized quantum phase estimation framework designed for multi-variate phase estimation. This allows the treatment of general correlation functions enabling the recovery of response properties of arbitrary orders. The generalized quantum phase estimation circuit has an intuitive construction that is linked with a physical process of interest, and can directly sample frequencies from the distribution that would be obtained experimentally. In addition, we provide a single-ancilla modification of the new framework for early fault-tolerant quantum computers. Overall, our framework enables the efficient simulation of spectroscopy experiments beyond the linear regime, such as Raman spectroscopy, having that the circuit cost grows linearly with respect to the order of the target nonlinear response. This opens up an exciting new field of applications for quantum computers with potential technological impact.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"27 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792496","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

Density matrix representation of hybrid tensor networks for noisy quantum devices 噪声量子器件混合张量网络的密度矩阵表示

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-08-07 DOI: 10.22331/q-2025-08-07-1823

Hiroyuki Harada, Yasunari Suzuki, Bo Yang, Yuuki Tokunaga, Suguru Endo

{"title":"Density matrix representation of hybrid tensor networks for noisy quantum devices","authors":"Hiroyuki Harada, Yasunari Suzuki, Bo Yang, Yuuki Tokunaga, Suguru Endo","doi":"10.22331/q-2025-08-07-1823","DOIUrl":"https://doi.org/10.22331/q-2025-08-07-1823","url":null,"abstract":"The hybrid tensor network (HTN) method is a general framework allowing for the construction of an effective wavefunction with the combination of classical tensors and quantum tensors, i.e., amplitudes of quantum states. In particular, hybrid tree tensor networks (HTTNs) are very useful for simulating larger systems beyond the available size of the quantum hardware. However, while the realistic quantum states in NISQ hardware are highly likely to be noisy, this framework is formulated for pure states. In this work, as well as discussing the relevant methods, i.e., Deep VQE and entanglement forging under the framework of HTTNs, we investigate the noisy HTN states by introducing the expansion operator for providing the description of the expansion of the size of simulated quantum systems and the noise propagation. This framework enables the general tree HTN states to be explicitly represented and their physicality to be discussed. We also show that the expectation value of a measured observable exponentially vanishes with the number of contracted quantum tensors. Our work will lead to providing the noise-resilient construction of HTN states.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"3 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792474","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

Families of $d=2$ 2D subsystem stabilizer codes for universal Hamiltonian quantum computation with two-body interactions 具有两体相互作用的通用哈密顿量子计算的$d=2$ 2D子系统稳定器码族

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-08-05 DOI: 10.22331/q-2025-08-05-1821

Phattharaporn Singkanipa, Zihan Xia, Daniel A. Lidar

引用次数: 0

A little bit of self-correction 一点点自我纠正

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-08-04 DOI: 10.22331/q-2025-08-04-1820

Michael J. Kastoryano, Lasse B. Kristensen, Chi-Fang Chen, Andras Gilyén

引用次数: 0

Connecting extended Wigner’s friend arguments and noncontextuality 连接扩展了维格纳的朋友论点和非语境性

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-07-31 DOI: 10.22331/q-2025-07-31-1819

Laurens Walleghem, Yìlè Yīng, Rafael Wagner, David Schmid

{"title":"Connecting extended Wigner’s friend arguments and noncontextuality","authors":"Laurens Walleghem, Yìlè Yīng, Rafael Wagner, David Schmid","doi":"10.22331/q-2025-07-31-1819","DOIUrl":"https://doi.org/10.22331/q-2025-07-31-1819","url":null,"abstract":"The Local Friendliness argument is an extended Wigner's friend no-go theorem that provides strong constraints on the nature of reality – stronger even than those imposed by Bell's theorem or by noncontextuality arguments. In this work, we prove a variety of connections between Local Friendliness scenarios and Kochen-Specker noncontextuality. Specifically, we first show how one can derive new Local Friendliness inequalities using known tools and results from the literature on Kochen-Specker noncontextuality. In doing so, we provide a new derivation for some of the facets of the Local Friendliness polytope, and we prove that this polytope is equal to the Bell polytope in a wide range of extended Wigner's friend scenarios with multipartite agents and sequential measurements. We then show how any possibilistic Kochen-Specker argument can be mathematically translated into a related proof of the Local Friendliness no-go theorem. In particular, we construct a novel kind of Local Friendliness scenario where a friend implements several compatible measurements (or joint measurements of these) in between the superobserver's operations on them. We illustrate this with the well-known 5-cycle and Peres-Mermin contextuality arguments.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"27 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144747619","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

Multipartite Embezzlement of Entanglement 多方侵占纠葛

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-07-30 DOI: 10.22331/q-2025-07-30-1818

Lauritz van Luijk, Alexander Stottmeister, Henrik Wilming

{"title":"Multipartite Embezzlement of Entanglement","authors":"Lauritz van Luijk, Alexander Stottmeister, Henrik Wilming","doi":"10.22331/q-2025-07-30-1818","DOIUrl":"https://doi.org/10.22331/q-2025-07-30-1818","url":null,"abstract":"Embezzlement of entanglement refers to the task of extracting entanglement from an entanglement resource via local operations and without communication while perturbing the resource arbitrarily little. Recently, the existence of embezzling states of bipartite systems of type III von Neumann algebras was shown. However, both the multipartite case and the precise relation between embezzling states and the notion of embezzling families, as originally defined by van Dam and Hayden, was left open. Here, we show that finite-dimensional approximations of multipartite embezzling states form multipartite embezzling families. In contrast, not every embezzling family converges to an embezzling state. We identify an additional consistency condition that ensures that an embezzling family converges to an embezzling state. This criterion distinguishes the embezzling family of van Dam and Hayden from the one by Leung, Toner, and Watrous. The latter generalizes to the multipartite setting. By taking a limit, we obtain a multipartite system of commuting type III$_1$ factors on which every state is an embezzling state. We discuss our results in the context of quantum field theory and quantum many-body physics. As open problems, we ask whether vacua of relativistic quantum fields in more than two spacetime dimensions are multipartite embezzling states and whether multipartite embezzlement allows for an operator-algebraic characterization.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"26 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144747652","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

Learning unitaries with quantum statistical queries 用量子统计查询学习酉元

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-07-30 DOI: 10.22331/q-2025-07-30-1817

Armando Angrisani

{"title":"Learning unitaries with quantum statistical queries","authors":"Armando Angrisani","doi":"10.22331/q-2025-07-30-1817","DOIUrl":"https://doi.org/10.22331/q-2025-07-30-1817","url":null,"abstract":"We propose several algorithms for learning unitary operators from quantum statistical queries with respect to their Choi-Jamiolkowski state. Quantum statistical queries capture the capabilities of a learner with limited quantum resources, which receives as input only noisy estimates of expected values of measurements. Our approach leverages quantum statistical queries to estimate the Fourier mass of a unitary on a subset of Pauli strings, generalizing previous techniques developed for uniform quantum examples. Specifically, we show that the celebrated quantum Goldreich-Levin algorithm can be implemented with quantum statistical queries, whereas the prior version of the algorithm involves oracle access to the unitary and its inverse. As an application, we prove that quantum Boolean functions with constant total influence or with constant degree are efficiently learnable in our model. Moreover, we prove that $mathcal{O}(log n)$-juntas are efficiently learnable and constant-depth circuits are learnable query-efficiently with quantum statistical queries. On the other hand, all previous algorithms for these tasks demand significantly greater resources, such as oracle access to the unitary or direct access to the Choi-Jamiolkowski state. We also demonstrate that, despite these positive results, quantum statistical queries lead to an exponentially larger query complexity for certain tasks, compared to separable measurements to the Choi-Jamiolkowski state. In particular, we show an exponential lower bound for learning a class of phase-oracle unitaries and a double exponential lower bound for testing the unitarity of channels. Taken together, our results indicate that quantum statistical queries offer a unified framework for various unitary learning tasks, with potential applications in quantum machine learning, many-body physics and benchmarking of near-term devices.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"1 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737701","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 Learning Theory Beyond Batch Binary Classification 超越批处理二进制分类的量子学习理论

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-07-29 DOI: 10.22331/q-2025-07-29-1813

Preetham Mohan, Ambuj Tewari

引用次数: 0

Exact Model Reduction for Continuous-Time Open Quantum Dynamics 连续时间开放量子动力学的精确模型简化

IF 6.4 2区物理与天体物理

Quantum Pub Date : 2025-07-29 DOI: 10.22331/q-2025-07-29-1814

Tommaso Grigoletto, Yukuan Tao, Francesco Ticozzi, Lorenza Viola

{"title":"Exact Model Reduction for Continuous-Time Open Quantum Dynamics","authors":"Tommaso Grigoletto, Yukuan Tao, Francesco Ticozzi, Lorenza Viola","doi":"10.22331/q-2025-07-29-1814","DOIUrl":"https://doi.org/10.22331/q-2025-07-29-1814","url":null,"abstract":"We consider finite-dimensional many-body quantum systems described by time-independent Hamiltonians and Markovian master equations, and present a systematic method for constructing smaller-dimensional, reduced models that $exactly$ reproduce the time evolution of a set of initial conditions or observables of interest. Our approach exploits Krylov operator spaces and their extension to operator algebras, and may be used to obtain reduced linear models of minimal dimension, well-suited for simulation on classical computers, or reduced quantum models that preserve the structural constraints of physically admissible quantum dynamics, as required for simulation on quantum computers. Notably, we prove that the reduced quantum-dynamical generator is still in Lindblad form. By introducing a new type of $textit{observable-dependent symmetries}$, we show that our method provides a non-trivial generalization of techniques that leverage symmetries, unlocking new reduction opportunities. We quantitatively benchmark our method on paradigmatic open many-body systems of relevance to condensed-matter and quantum-information physics. In particular, we demonstrate how our reduced models can quantitatively describe decoherence dynamics in central-spin systems coupled to structured environments, magnetization transport in boundary-driven dissipative spin chains, and unwanted error dynamics on information encoded in a noiseless quantum code.","PeriodicalId":20807,"journal":{"name":"Quantum","volume":"4 1","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144719525","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