6651期

最新文章

• Mid-circuit correction of correlated phase errors using an array of spectator qubits AI翻译
  作者：Singh, K.; Bradley, C. E.; Anand, S.; Ramesh, V.; White, R.; Bernien, H.
  作者单位：University of Chicago; University of Chicago; University of Chicago
  摘要：Scaling up invariably error-prone quantum processors is a formidable challenge. Although quantum error correction ultimately promises fault-tolerant operation, the required qubit overhead and error thresholds are daunting. In a complementary proposal, colocated, auxiliary spectator qubits act as in situ probes of noise and enable real-time, coherent corrections of data qubit errors. We used an array of cesium spectator qubits to correct correlated phase errors on an array of rubidium data qubi...
• Superconducting vortices carrying a temperature-dependent fraction of the flux quantum AI翻译
  作者：Iguchi, Yusuke; Shi, Ruby A. A.; Kihou, Kunihiro; Lee, Chul-Ho; Barkman, Mats; Benfenati, Andrea L. L.; Grinenko, Vadim; Babaev, Egor; Moler, Kathryn A. A.
  作者单位：Stanford University; Stanford University; United States Department of Energy (DOE); SLAC National Accelerator Laboratory; Stanford University; National Institute of Advanced Industrial Science & Technology (AIST); Royal Institute of Technology; Shanghai Jiao Tong University; Stanford University
  摘要：Magnetic field penetrates type-II bulk superconductors by forming quantum vortices that enclose a magnetic flux equal to the magnetic flux quantum. The flux quantum is a universal quantity that depends only on fundamental constants. In this study, we investigated isolated vortices in the hole-overdoped Ba1-xKxFe2As2 (x = 0.77) by using scanning superconducting quantum interference device (SQUID) magnetometry. In many locations, we observed objects that carried only part of a flux quantum, with...
• Large herbivore diversity slows sea ice-associated decline in arctic tundra diversity AI翻译
  作者：Post, Eric; Kaarlejarvi, Elina; Macias-Fauria, Marc; Watts, David A.; Boving, Pernille Sporon; Cahoon, Sean M. P.; Higgins, R. Conor; John, Christian; Kerby, Jeffrey T.; Pedersen, Christian; Post, Mason; Sullivan, Patrick F.
  作者单位：University of California System; University of California Davis; University of Helsinki; University of Oxford; United States Department of Agriculture (USDA); United States Forest Service; Aarhus University; Aarhus University; Norwegian Institute of Bioeconomy Research; University of Washington; University of Washington Seattle; University of Washington; University of Washington Seattle; University of Alaska System; University of Alaska Anchorage; University of California System; University of California Santa Barbara
  摘要：Biodiversity is declining globally in response to multiple human stressors, including climate forcing. Nonetheless, local diversity trends are inconsistent in some taxa, obscuring contributions of local processes to global patterns. Arctic tundra diversity, including plants, fungi, and lichens, declined during a 15-year experiment that combined warming with exclusion of large herbivores known to influence tundra vegetation composition. Tundra diversity declined regardless of experimental treat...
• Structures of the free and capped ends of the actin filament AI翻译
  作者：Carman, Peter J.; Barrie, Kyle R.; Rebowski, Grzegorz; Dominguez, Roberto
  作者单位：University of Pennsylvania; University of Pennsylvania
  摘要：The barbed and pointed ends of the actin filament (F-actin) are the sites of growth and shrinkage and the targets of capping proteins that block subunit exchange, including CapZ at the barbed end and tropomodulin at the pointed end. We describe cryo-electron microscopy structures of the free and capped ends of F-actin. Terminal subunits at the free barbed end adopt a flat F-actin conformation. CapZ binds with minor changes to the barbed end but with major changes to itself. By contrast, subuni...
• Africa increases HIV research AI翻译
  作者：Brainard, Jeffrey
• The prospects of high-temperature superconductors AI翻译
  作者：Molodyk, Alexander; Larbalestier, David C.
  作者单位：State University System of Florida; Florida State University
• Love plus Science AI翻译
  作者：Thorp, H. Holden
• In Science Journals AI翻译
  作者：Lopez, Bianca; Lavine, Marc S.; Funk, Michael A.; Stajic, Jelena; Ross, Sarah H.; Stern, Peter; Fogg, Christiana N.; Hurtley, Stella M.; Jiang, Di; Hines, Pamela J.; Wong, Wei
• Deformable hard tissue with high fatigue resistance in the hinge of bivalve Cristaria plicata AI翻译
  作者：Meng, Xiang-Sen; Zhou, Li-Chuan; Liu, Lei; Zhu, Yin-Bo; Meng, Yu-Feng; Zheng, Dong-Chang; Yang, Bo; Rao, Qi-Zhi; Mao, Li-Bo; Wu, Heng-An; Yu, Shu-Hong
  作者单位：Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Hefei University of Technology; Southern University of Science & Technology
  摘要：The hinge of bivalve shells can sustain hundreds of thousands of repeating opening-and-closing valve motions throughout their lifetime. We studied the hierarchical design of the mineralized tissue in the hinge of the bivalve Cristaria plicata, which endows the tissue with deformability and fatigue resistance and consequently underlies the repeating motion capability. This folding fan-shaped tissue consists of radially aligned, brittle aragonite nanowires embedded in a resilient matrix and can ...
• An EU landmark for AI governance AI翻译
  作者：Gasser, Urs
  作者单位：Technical University of Munich; Technical University of Munich
  摘要：A groundbreaking draft law adopted with overwhelming majority by the European Parliament provides a glimpse into the future of governance of artificial intelligence (AI). The AI Act (AIA) aims to safeguard fundamental rights and ensure the ethical development of AI in Europe and beyond. It is the most ambitious framework to date designed to guide the development and usage of AI. The vote echoes a growing chorus of researchers from various disciplines calling for guardrails to govern powerful A...