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"Feng, Li"
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Multiplexed storage and real-time manipulation based on a multiple degree-of-freedom quantum memory
The faithful storage and coherent manipulation of quantum states with matter-systems would enable the realization of large-scale quantum networks based on quantum repeaters. To achieve useful communication rates, highly multimode quantum memories are required to construct a multiplexed quantum repeater. Here, we present a demonstration of on-demand storage of orbital-angular-momentum states with weak coherent pulses at the single-photon-level in a rare-earth-ion-doped crystal. Through the combination of this spatial degree-of-freedom (DOF) with temporal and spectral degrees of freedom, we create a multiple-DOF memory with high multimode capacity. This device can serve as a quantum mode converter with high fidelity, which is a fundamental requirement for the construction of a multiplexed quantum repeater. This device further enables essentially arbitrary spectral and temporal manipulations of spatial-qutrit-encoded photonic pulses in real time. Therefore, the developed quantum memory can serve as a building block for scalable photonic quantum information processing architectures.
Multiplexing of quantum memories would enable higher communication rate for repeater based quantum networks. Here, the authors demonstrate multiplexed storage of single-photon-level pulses using multiple degree-of-freedom, with the additional function of arbitrary manipulation of photonic pulses in real time.
Journal Article
Heterovalent-doping-enabled atom-displacement fluctuation leads to ultrahigh energy-storage density in AgNbO3-based multilayer capacitors
Dielectric capacitors with high energy storage performance are highly desired for next-generation advanced high/pulsed power capacitors that demand miniaturization and integration. However, the poor energy-storage density that results from the low breakdown strength, has been the major challenge for practical applications of dielectric capacitors. Herein, we propose a heterovalent-doping-enabled atom-displacement fluctuation strategy for the design of low-atom-displacements regions in the antiferroelectric matrix to achieve the increase in breakdown strength and enhancement of the energy-storage density for AgNbO
3
-based multilayer capacitors. An ultrahigh breakdown strength ~1450 kV·cm
−1
is realized in the Sm
0.05
Ag
0.85
Nb
0.7
Ta
0.3
O
3
multilayer capacitors, especially with an ultrahigh U
rec
~14 J·cm
−3
, excellent η ~ 85% and P
D,max
~ 102.84 MW·cm
−3
, manifesting a breakthrough in the comprehensive energy storage performance for lead-free antiferroelectric capacitors. This work offers a good paradigm for improving the energy storage properties of antiferroelectric multilayer capacitors to meet the demanding requirements of advanced energy storage applications.
AgNbO
3
has a potential for high power capacitors due to its antiferroelectric characteristics. Here, the authors achieve multilayer capacitors with energy-storage density of 14 J·cm
−3
by heterovalent-doping-enabled atom-displacement fluctuation.
Journal Article
Bureaucracy and the state in early China : governing the western Zhou
Ancient Chinese society developed a sophisticated bureaucracy which is still in operation today and which had its pristine form in the government of the Western Zhou from 1045 to 771 BC. This study explores and interprets the origins and operational characteristics of that bureaucracy.
Book
Hypoxia and the Tumor Microenvironment
Hypoxia is an important feature of the tumor microenvironment, and is closely associated with cell proliferation, angiogenesis, metabolism and the tumor immune response. All these factors can further promote tumor progression, increase tumor aggressiveness, enhance tumor metastatic potential and lead to poor prognosis. In this review, these effects of hypoxia on tumor biology will be discussed, along with their significance for tumor detection and treatment.
Journal Article
حيوية شينجيانغ
يتناول كتاب (حيوية شينجيانغ) الإنجازات والنتائج المتميزة التي حققتها شينجيانغ منذ عهد الإصلاح والانفتاح تحت قيادة اللجنة المركزية للحزب الشيوعي الصيني وفي ظل الجهود المشتركة بين كافة القوميات بشينجيانغ معتمدا على التغيير والتنمية التي حظيت بها شينجيانغ في العصر الحديث، وذلك من خلال مجموعة من الجوانب مثل تطور النقل والمواصلات بشينجيانغ والتحضر والزراعة والصناعة والقضايا الاجتماعية والجوانب المعيشية وغيرها، كما استعرض الكتاب الحياة السعيدة التي تمتعت بها كافة قوميات شينجيانغ في ظل العصر الحديث. وهكذا يكون الكتاب قد قدم للقارئ شينجيانغ الحيوية التي تتمتع بالنشاط والعزيمة.
Book
Lead-free piezoceramics: Status and perspectives
The field of lead-free piezoceramics, which aims to replace lead zirconate titanate (PZT) and related perovskite materials, has been vibrant for almost 15 years. Once the science in this field attained a certain stage of maturity, materials with properties better than PZT have appeared, and the first products are about to reach the marketplace. This article describes the three most promising lead-free piezoceramics currently under discussion to replace PZT. Each has a pronounced property profile geared for specific applications. Guidelines for directions for fundamental future research on as well as technology transfer to industry of lead-free piezoceramics are provided.
Journal Article
A single mutation in the prM protein of Zika virus contributes to fetal microcephaly
Zika virus (ZIKV) has evolved into a global health threat because of its unexpected causal link to microcephaly. Phylogenetic analysis reveals that contemporary epidemic strains have accumulated multiple substitutions from their Asian ancestor. Here we show that a single serine-to-asparagine substitution [Ser139→Asn139 (S139N)] in the viral polyprotein substantially increased ZIKV infectivity in both human and mouse neural progenitor cells (NPCs) and led to more severe microcephaly in the mouse fetus, as well as higher mortality rates in neonatal mice. Evolutionary analysis indicates that the S139N substitution arose before the 2013 outbreak in French Polynesia and has been stably maintained during subsequent spread to the Americas. This functional adaption makes ZIKV more virulent to human NPCs, thus contributing to the increased incidence of microcephaly in recent ZIKV epidemics.
Journal Article