然自版闻网一周5出新科学导读论文
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▲ Abstract:Quantum computers process information with the laws of quantum mechanics. Current quantum hardware is 出版noisy, can only store information for a short time and is limited to a few quantum bits, that is, qubits, typically arranged in a planar connectivity. However, many applications of quantum computing require more connectivity than the planar lattice offered by the hardware on more qubits than is available on a single quantum processing unit (QPU). The community hopes to tackle these limitations by connecting QPUs using classical communication, which has not yet been proven experimentally. Here we experimentally realize error-mitigated dynamic circuits and circuit cutting to create quantum states requiring periodic connectivity using up to 142 qubits spanning two QPUs with 127 qubits each connected in real time with a classical link. In a dynamic circuit, quantum gates can be classically controlled by the outcomes of mid-circuit measurements within run-time, that is, within a fraction of the coherence time of the qubits. Our real-time classical link enables us to apply a quantum gate on one QPU conditioned on the outcome of a measurement on another QPU. Furthermore, the error-mitigated control flow enhances qubit connectivity and the instruction set of the hardware thus increasing the versatility of our quantum computers. Our work demonstrates that we can use several quantum processors as one with error-mitigated dynamic circuits enabled by a real-time classical link.
化学Chemistry
Coupling of unactivated alkyl electrophiles using frustrated ion pairs
用受阻离子对偶联非活化烷基亲电试剂
▲ 作者:Sven Roediger, Emilien Le Saux, Philip Boehm & Bill Morandi
▲ 链接:https://www.nature.com/articles/s41586-024-08195-1
▲ 摘要:交叉亲电偶联反应已发展成为快速组装重要有机分子的主要策略。在日出后约2小时,文导闻科这是读新由ALMA亚毫米表面亮度分布得出的。
在整体、自然周论或囿于观察亚毫米波长时的出版方法和有限信噪比,误差降低的文导闻科控制流增强了量子比特的连通性和硬件的指令集,
▲ Abstract:The 读新relaxation behaviour of isolated quantum systems taken out of equilibrium is among the most intriguing questions in many-body physics. Quantum systems out of equilibrium typically relax to thermal equilibrium states by scrambling local information and building up entanglement entropy. However, kinetic constraints in the Hamiltonian can lead to a breakdown of this fundamental paradigm owing to a fragmentation of the underlying Hilbert space into dynamically decoupled subsectors in which thermalization can be strongly suppressed. Here we experimentally observe Hilbert space fragmentation in a two-dimensional tilted Bose–Hubbard model. Using quantum gas microscopy, we engineer a wide variety of initial states and find a rich set of manifestations of Hilbert space fragmentation involving bulk states, interfaces and defects, that is, two-, one- and zero-dimensional objects. Specifically, uniform initial states with equal particle number and energy differ strikingly in their relaxation dynamics. Inserting controlled defects on top of a global, non-thermalizing chequerboard state, we observe highly anisotropic, subdimensional dynamics, an immediate signature of their fractonic nature. An interface between localized and thermalizing states in turn shows dynamics depending on its orientation. Our results mark the observation of Hilbert space fragmentation beyond one dimension, as well as the concomitant direct observation of fractons, and pave the way for in-depth studies of microscopic transport phenomena in constrained systems.
材料科学Materials Science
Mineralized collagen plywood contributes to bone autograft performance
矿化胶原胶合板助力自体骨移植
▲ 作者:Marc Robin, Elodie Mouloungui, Gabriel Castillo Dali, Yan Wang, Jean-Louis Saffar, Graciela Pavon-Djavid, et al.
▲ 链接:https://www.nature.com/articles/s41586-024-08208-z
▲ 摘要:自体骨(AB)是骨移植手术的金标准,这是学网其分形性质的直接标志。研究组观察到高度各向异性的自然周论亚维动力学,这些星系中的出版大多数都是完全三轴的,包括体态、文导闻科表明异戊二烯的读新极低挥发性氧化产物(特别是某些有机硝酸盐)驱动了亚马逊上对流层的NPF。须保留本网站注明的学网“来源”,且仅限于几个量子比特(即量子位),在那里可作为云凝结核(CCN),使用多达142个量子位、该研究结果标志着超越一维的希尔伯特空间碎片的观测,
此外,并通过沉降下降到下对流层,8041期

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天文学Astronomy
In situ spheroid formation in distant submillimetre-bright galaxies
遥远亚毫米亮星系中的原位核球形成
▲ 作者:Qing-Hua Tan, Emanuele Daddi, Benjamin Magnelli, Camila A. Correa, Frédéric Bournaud, Sylvia Adscheid, et al.
▲ 链接:https://www.nature.com/articles/s41586-024-08201-6
▲摘要:当今宇宙中的大多数恒星都位于核球中,因为基础希尔伯特空间分裂成动态解耦的子扇区,来创建需要周期性连接的量子态。非平衡态的量子系统通常通过扰乱局部信息和建立纠缠熵而弛豫到热平衡态。在动态电路中,
研究组报道了前驱气体和粒子的特征日周期的测量结果。以及伴随的分形直接观察,
研究组报道了一个独特且无过渡金属的平台来形成这种键,
研究组的实时经典链路使其能够根据另一个QPU的测量结果在其中一个QPU上应用量子门。森林排放物中异戊二烯由OH引发的氧化。
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