npj Quantum Information最新文献

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Randomized semi-quantum matrix processing 随机半量子矩阵处理
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-30 DOI: 10.1038/s41534-024-00883-0
Allan Tosta, Thais de Lima Silva, Giancarlo Camilo, Leandro Aolita
{"title":"Randomized semi-quantum matrix processing","authors":"Allan Tosta, Thais de Lima Silva, Giancarlo Camilo, Leandro Aolita","doi":"10.1038/s41534-024-00883-0","DOIUrl":"https://doi.org/10.1038/s41534-024-00883-0","url":null,"abstract":"<p>We present a hybrid quantum-classical framework for simulating generic matrix functions more amenable to early fault-tolerant quantum hardware than standard quantum singular-value transformations. The method is based on randomization over the Chebyshev approximation of the target function while keeping the matrix oracle quantum, and is assisted by a variant of the Hadamard test that removes the need for post-selection. The resulting statistical overhead is similar to the fully quantum case and does not incur any circuit depth degradation. On the contrary, the average circuit depth is shown to get smaller, yielding equivalent reductions in noise sensitivity, as explicitly shown for depolarizing noise and coherent errors. We apply our technique to partition-function estimation, linear system solvers, and ground-state energy estimation. For these cases, we prove advantages on average depths, including quadratic speed-ups on costly parameters and even the removal of the approximation-error dependence.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"115 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142330330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Protocol for certifying entanglement in surface spin systems using a scanning tunneling microscope 利用扫描隧道显微镜认证表面自旋系统纠缠的协议
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-28 DOI: 10.1038/s41534-024-00888-9
Rik Broekhoven, Curie Lee, Soo-hyon Phark, Sander Otte, Christoph Wolf
{"title":"Protocol for certifying entanglement in surface spin systems using a scanning tunneling microscope","authors":"Rik Broekhoven, Curie Lee, Soo-hyon Phark, Sander Otte, Christoph Wolf","doi":"10.1038/s41534-024-00888-9","DOIUrl":"https://doi.org/10.1038/s41534-024-00888-9","url":null,"abstract":"<p>Certifying quantum entanglement is a critical step toward realizing quantum-coherent applications. In this work, we show that entanglement of spins can be unambiguously evidenced in a scanning tunneling microscope with electron spin resonance by exploiting the fact that entangled states undergo a free time evolution with a distinct characteristic time constant that clearly distinguishes it from the time evolution of non-entangled states. By implementing a phase control scheme, the phase of this time evolution can be mapped back onto the population of one entangled spin, which can then be read out reliably using a weakly coupled sensor spin in the junction of the scanning tunneling microscope. We demonstrate through open quantum system simulations with currently available spin coherence times of <i>T</i><sub>2</sub> ≈ 300 ns, that a signal directly correlated with the degree of entanglement can be measured at temperatures of 100–400 mK accessible in sub-Kelvin scanning tunneling microscopes.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"25 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Superdiffusive to ballistic transport in nonintegrable Rydberg simulator 非积分雷德贝格模拟器中的超扩散到弹道输运
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-19 DOI: 10.1038/s41534-024-00884-z
Chun Chen, Yan Chen, Xiaoqun Wang
{"title":"Superdiffusive to ballistic transport in nonintegrable Rydberg simulator","authors":"Chun Chen, Yan Chen, Xiaoqun Wang","doi":"10.1038/s41534-024-00884-z","DOIUrl":"https://doi.org/10.1038/s41534-024-00884-z","url":null,"abstract":"<p>A common wisdom posits that transport of conserved quantities across clean nonintegrable quantum systems at high temperatures is diffusive when probed from the emergent hydrodynamic regime. We show that this empirical paradigm may alter if the strong interaction limit is taken. Using Krylov-typicality and purification matrix-product-state methods, we establish in short-to-intermediate time scales the following observations for the nonintegrable lattice model imitating the experimental Rydberg blockade simulator. Given the strict projection owing to the infinite density-density repulsion <i>V</i>, the Rydberg chain’s energy transport in the presence of a transverse field <i>g</i> is tentatively superdiffusive at infinite temperature featured by an anomalous scaling exponent <span>(frac{3}{4})</span>, indicating the potential existence of a novel dynamical universality class. Imposing, in addition, a growing longitudinal field <i>h</i> causes a putative superdiffusion-to-ballistic transport transition at <i>h</i> ≈ <i>g</i>. Interestingly, all the above results persist for large but finite interactions and temperatures, provided that the strongly interacting condition <i>g</i>, <i>h</i> <span>≪</span> <i>k</i><sub>B</sub><i>T</i> <span>≪</span> <i>V</i> is fulfilled. Our predictions are testable by current Rydberg quantum simulation facilities.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"14 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142245185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Demonstration of quantum network protocols over a 14-km urban fiber link 通过 14 千米城市光纤链路演示量子网络协议
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-14 DOI: 10.1038/s41534-024-00886-x
Stephan Kucera, Christian Haen, Elena Arenskötter, Tobias Bauer, Jonas Meiers, Marlon Schäfer, Ross Boland, Milad Yahyapour, Maurice Lessing, Ronald Holzwarth, Christoph Becher, Jürgen Eschner
{"title":"Demonstration of quantum network protocols over a 14-km urban fiber link","authors":"Stephan Kucera, Christian Haen, Elena Arenskötter, Tobias Bauer, Jonas Meiers, Marlon Schäfer, Ross Boland, Milad Yahyapour, Maurice Lessing, Ronald Holzwarth, Christoph Becher, Jürgen Eschner","doi":"10.1038/s41534-024-00886-x","DOIUrl":"https://doi.org/10.1038/s41534-024-00886-x","url":null,"abstract":"<p>We report on the implementation of quantum entanglement distribution and quantum state teleportation over a 14.4 km urban dark-fiber link, which is partially underground, partially overhead, and patched in several stations. We characterize the link for its use as a quantum channel and realize its active polarization stabilization. Using a type-II cavity-enhanced SPDC photon pair source, a <sup>40</sup>Ca<sup>+</sup> single-ion quantum memory, and quantum frequency conversion to the telecom C-band, we demonstrate photon-photon entanglement, ion-photon entanglement, and teleportation of a qubit state from the ion onto a remote telecom photon, all realized over the urban fiber link.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"44 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142231455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Experimental preparation of multiphoton-added coherent states of light 光的多光子相干态的实验制备
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-14 DOI: 10.1038/s41534-024-00885-y
Jiří Fadrný, Michal Neset, Martin Bielak, Miroslav Ježek, Jan Bílek, Jaromír Fiurášek
{"title":"Experimental preparation of multiphoton-added coherent states of light","authors":"Jiří Fadrný, Michal Neset, Martin Bielak, Miroslav Ježek, Jan Bílek, Jaromír Fiurášek","doi":"10.1038/s41534-024-00885-y","DOIUrl":"https://doi.org/10.1038/s41534-024-00885-y","url":null,"abstract":"<p>Conditional addition of photons represents a crucial tool for optical quantum state engineering and it forms a fundamental building block of advanced quantum photonic devices. Here we report on experimental implementation of the conditional addition of several photons. We demonstrate the addition of one, two, and three photons to input coherent states with various amplitudes. The resulting highly nonclassical photon-added states are completely characterized with time-domain homodyne tomography, and the nonclassicality of the prepared states is witnessed by the negativity of their Wigner functions. We experimentally demonstrate that the conditional addition of photons realizes approximate noiseless quantum amplification of coherent states with sufficiently large amplitude. We also investigate certification of the stellar rank of the generated multiphoton-added coherent states, which quantifies the non-Gaussian resources required for their preparation. Our results pave the way towards the experimental realization of complex optical quantum operations based on combination of multiple photon additions and subtractions.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"4 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142231454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
An extremely bad-cavity laser 极差腔激光器
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00880-3
Jia Zhang, Tiantian Shi, Jianxiang Miao, Deshui Yu, Jingbiao Chen
{"title":"An extremely bad-cavity laser","authors":"Jia Zhang, Tiantian Shi, Jianxiang Miao, Deshui Yu, Jingbiao Chen","doi":"10.1038/s41534-024-00880-3","DOIUrl":"https://doi.org/10.1038/s41534-024-00880-3","url":null,"abstract":"<p>Lasing in the bad-cavity regime has promising applications in quantum precision measurement and frequency metrology due to the reduced sensitivity of the laser frequency to cavity-length fluctuations. Thus far, relevant studies have been mainly focused on conventional cavities whose finesse is high enough that the resonance linewidth is sufficiently narrow compared to the cavity’s free spectral range, though still in the bad-cavity regime. However, lasing output from the cavity whose finesse is close to the limit of 2 has never been experimentally accessed. Here, we demonstrate an extremely bad-cavity laser, analyze the physical mechanisms limiting cavity finesse, and report on the worst-ever laser cavity with finesse reaching 2.01. The optical cavity has a reflectance close to zero and only provides weak optical feedback. The laser power can be as high as tens of <i>μ</i>W and the spectral linewidth reaches a few kHz, over one thousand times narrower than the gain bandwidth. In addition, the measurement of cavity pulling reveals a pulling coefficient of 0.0148, the lowest value ever achieved for a continuous-wave laser. Our findings open up an unprecedentedly innovative perspective for future new ultra-stable lasers, which could possibly trigger future discoveries in optical clocks, cavity QED, continuous-wave superradiant laser, and explorations of quantum many-body physics.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"4 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142231456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 autoencoders using mixed reference states 使用混合参考状态的量子自动编码器
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00872-3
Hailan Ma, Gary J. Mooney, Ian R. Petersen, Lloyd C. L. Hollenberg, Daoyi Dong
{"title":"Quantum autoencoders using mixed reference states","authors":"Hailan Ma, Gary J. Mooney, Ian R. Petersen, Lloyd C. L. Hollenberg, Daoyi Dong","doi":"10.1038/s41534-024-00872-3","DOIUrl":"https://doi.org/10.1038/s41534-024-00872-3","url":null,"abstract":"<p>One of the fundamental tasks in quantum information theory is quantum data compression, which can be realized via quantum autoencoders that first compress quantum states to low-dimensional ones and then recover to the original ones with a reference state. When taking a pure reference state, there exists an upper bound for the encoding fidelity, which limits the compression of states with high entropy. To overcome the entropy inconsistency, we allow the reference state to be a mixed state and propose a cost function that combines the encoding fidelity and the quantum mutual information. We consider the reference states to be a mixture of maximally mixed states and pure states and propose three strategies for setting the ratio of mixedness. Numerical simulations of different states and experimental implementations on IBM quantum computers illustrate the effectiveness of our approach.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"61 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Polarization-entangled photons from a whispering gallery resonator 来自耳语画廊谐振器的偏振纠缠光子
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00876-z
Sheng-Hsuan Huang, Thomas Dirmeier, Golnoush Shafiee, Kaisa Laiho, Dmitry V. Strekalov, Gerd Leuchs, Christoph Marquardt
{"title":"Polarization-entangled photons from a whispering gallery resonator","authors":"Sheng-Hsuan Huang, Thomas Dirmeier, Golnoush Shafiee, Kaisa Laiho, Dmitry V. Strekalov, Gerd Leuchs, Christoph Marquardt","doi":"10.1038/s41534-024-00876-z","DOIUrl":"https://doi.org/10.1038/s41534-024-00876-z","url":null,"abstract":"<p>Crystalline whispering gallery mode resonators (WGMRs) have been shown to facilitate versatile sources of quantum states that can efficiently interact with atomic systems. These features make WGMRs an efficient platform for quantum information processing. Here, we experimentally show that it is possible to generate polarization entanglement from WGMRs by using an interferometric scheme. Our scheme gives us the flexibility to control the phase of the generated entangled state by changing the relative phase of the interferometer. The <i>S</i> value of Clauser–Horne–Shimony–Holt’s inequality in the system is 2.45 ± 0.07, which violates the inequality by more than six standard deviations.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"73 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Large-scale simulations of Floquet physics on near-term quantum computers 在近期量子计算机上对 Floquet 物理进行大规模模拟
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00866-1
Timo Eckstein, Refik Mansuroglu, Piotr Czarnik, Jian-Xin Zhu, Michael J. Hartmann, Lukasz Cincio, Andrew T. Sornborger, Zoë Holmes
{"title":"Large-scale simulations of Floquet physics on near-term quantum computers","authors":"Timo Eckstein, Refik Mansuroglu, Piotr Czarnik, Jian-Xin Zhu, Michael J. Hartmann, Lukasz Cincio, Andrew T. Sornborger, Zoë Holmes","doi":"10.1038/s41534-024-00866-1","DOIUrl":"https://doi.org/10.1038/s41534-024-00866-1","url":null,"abstract":"<p>Periodically driven quantum systems exhibit a diverse set of phenomena but are more challenging to simulate than their equilibrium counterparts. Here, we introduce the Quantum High-Frequency Floquet Simulation (QHiFFS) algorithm as a method to simulate fast-driven quantum systems on quantum hardware. Central to QHiFFS is the concept of a kick operator which transforms the system into a basis where the dynamics is governed by a time-independent effective Hamiltonian. This allows prior methods for time-independent simulation to be lifted to simulate Floquet systems. We use the periodically driven biaxial next-nearest neighbor Ising (BNNNI) model, a natural test bed for quantum frustrated magnetism and criticality, as a case study to illustrate our algorithm. We implemented a 20-qubit simulation of the driven two-dimensional BNNNI model on Quantinuum’s trapped ion quantum computer. Our error analysis shows that QHiFFS exhibits not only a cubic advantage in driving frequency <i>ω</i> but also a linear advantage in simulation time <i>t</i> compared to Trotterization.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"30 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Heisenberg-limited Hamiltonian learning for interacting bosons 相互作用玻色子的海森堡有限哈密顿学习
IF 7.6 1区 物理与天体物理
npj Quantum Information Pub Date : 2024-09-11 DOI: 10.1038/s41534-024-00881-2
Haoya Li, Yu Tong, Tuvia Gefen, Hongkang Ni, Lexing Ying
{"title":"Heisenberg-limited Hamiltonian learning for interacting bosons","authors":"Haoya Li, Yu Tong, Tuvia Gefen, Hongkang Ni, Lexing Ying","doi":"10.1038/s41534-024-00881-2","DOIUrl":"https://doi.org/10.1038/s41534-024-00881-2","url":null,"abstract":"<p>We develop a protocol for learning a class of interacting bosonic Hamiltonians from dynamics with Heisenberg-limited scaling. For Hamiltonians with an underlying bounded-degree graph structure, we can learn all parameters with root mean square error <i>ϵ</i> using <span>({mathcal{O}}(1/epsilon ))</span> total evolution time, which is independent of the system size, in a way that is robust against state-preparation and measurement error. In the protocol, we only use bosonic coherent states, beam splitters, phase shifters, and homodyne measurements, which are easy to implement on many experimental platforms. A key technique we develop is to apply random unitaries to enforce symmetry in the effective Hamiltonian, which may be of independent interest.</p>","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"213 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142166156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
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