We present a scheme to entangle two magnon modes in a cavity magnomechanical system. The two magnon modes are embodied by collective motions of a large number of spins in two macroscopic ...ferrimagnets, and couple to a single microwave cavity mode via magnetic dipole interaction. We show that by activating the nonlinear magnetostrictive interaction in one ferrimagnet, realized by driving the magnon mode with a strong red-detuned microwave field, the two magnon modes can be prepared in an entangled state. The entanglement is achieved by exploiting the nonlinear magnon-phonon coupling and the linear magnon-cavity coupling, and is in the steady state and robust against temperature. The entangled magnon modes in two massive ferrimagnets represent genuinely macroscopic quantum states, and may find applications in the study of macroscopic quantum mechanics and quantum information processing based on magnonics.
A model-by-model analysis for historical simulations was necessary for identifying reasonably performing models in the updated Coupled Model Intercomparison Project (CMIP6) over the Tibetan Plateau. ...To determine whether the capacity of the CMIP6 models in simulating temperature and precipitation over the Plateau has been enhanced, we compared the outputs of 23 CMIP6 models with an observational dataset (CN05.1) for the period 1961–2014. The results suggest the systematic model biases (cold bias and wet bias) in the Tibetan Plateau still exist in CMIP6. Most models in CMIP6 realistically simulated the surface temperature and spatial distribution of precipitation, with a pattern correlation exceeding 0.75. The bias in the mean surface temperature of the multi-model ensemble (MME) simulation was 1.08 °C lower than the observational data, which had been decreased compared with the cold bias of CMIP5 (1.52 °C). At the seasonal scale, most models exhibited a warm temperature bias in summer and a cold bias in winter. The CMIP6 MME displayed a higher reproducibility of the precipitation amplitude over dry regions compared with CMIP5 and a lower ability over wet regions.
A
bstract
Analysis of EDGES data shows an absorption signal of the redshifted 21-cm line of atomic hydrogen at
z
∼ 17 which is stronger than expected from the standard ΛCDM model. The absorption ...signal interpreted as brightness temperature
T
21
of the 21-cm line gives an amplitude of
−
500
−
500
+
200
mK at 99% C.L. which is a 3.8
σ
deviation from what the standard ΛCDM cosmology gives. We present a particle physics model for the baryon cooling where a fraction of the dark matter resides in the hidden sector with a U(1) gauge symmetry and a Stueckelberg mechanism operates mixing the visible and the hidden sectors with the hidden sector consisting of dark Dirac fermions and dark photons. The Stueckelberg mass mixing mechanism automatically generates a millicharge for the hidden sector dark fermions providing a theoretical basis for using millicharged dark matter to produce the desired cooling of baryons seen by EDGES by scattering from millicharged dark matter. We compute the relic density of the millicharged dark matter by solving a set of coupled equations for the dark fermion and dark photon yields and for the temperature ratio of the hidden sector and the visible sector heat baths. For the analysis of baryon cooling, we analyze the evolution equations for the temperatures of baryons and millicharged dark matter as a function of the redshift. We exhibit regions of the parameter space which allow consistency with the EDGES data. We note that the Stueckelberg mechanism arises naturally in strings and the existence of a millicharge would point to its string origin.
Purpose
Workplace bullying is a common negative event suffered by employees in the workplace. The harm it brings to the organization has become the focus of the field of organizational behavior. The ...purpose of this study was to explore whether workplace bullying has an impact on employee knowledge hiding and to discover the underlying mechanism between the two.
Design/methodology/approach
Based on the conservation of resource theory and the cognitive-affective personality system theory, this paper surveys 327R&D employees of Chinese technological corporations at two time points and explores the relationship between workplace bullying and knowledge hiding as well as the underlying mechanism. This study used confirmatory factor analysis, bootstrapping method and structural equation model to validate the research hypothesis.
Findings
The results show that workplace bullying positively correlates with knowledge hiding; emotional exhaustion and organizational identification play a mediation role between workplace bullying and knowledge hiding, and both variables play a chain mediation role in that relationship; and forgiveness climate moderates the positive impact of workplace bullying on emotional exhaustion, further moderating the chain mediation role of emotional exhaustion and organizational identification.
Originality/value
The findings of this study can not only complement the existing researches on the influence of negative workplace events on employees’ knowledge hiding behaviors but also strengthen scholars’ attention and understanding of the internal mechanism between workplace bullying and knowledge hiding.
Multipartite entangled states are crucial for numerous applications in quantum information science. However, the generation and verification of multipartite entanglement on fully controllable and ...scalable quantum platforms remains an outstanding challenge. We report the deterministic generation of an 18-qubit Greenberger-Horne-Zeilinger (GHZ) state and multicomponent atomic Schrödinger cat states of up to 20 qubits on a quantum processor, which features 20 superconducting qubits, also referred to as artificial atoms, interconnected by a bus resonator. By engineering a one-axis twisting Hamiltonian, the system of qubits, once initialized, coherently evolves to multicomponent atomic Schrödinger cat states-that is, superpositions of atomic coherent states including the GHZ state-at specific time intervals as expected. Our approach on a solid-state platform should not only stimulate interest in exploring the fundamental physics of quantum many-body systems, but also enable the development of applications in practical quantum metrology and quantum information processing.
In 2010, a panel of Chinese pathologists reported the first expert consensus for the pathological diagnosis of primary liver cancers to address the many contradictions and inconsistencies in the ...pathological characteristics and diagnostic criteria for PLC. Since then considerable clinicopathological studies have been conducted globally, prompting us to update the practice guidelines for the pathological diagnosis of PLC. In April 18, 2014, a Guideline Committee consisting of 40 specialists from seven Chinese Societies(including Chinese Society of Liver Cancer, Chinese Anti-Cancer Association; Liver Cancer Study Group, Chinese Society of Hepatology, Chinese Medical Association; Chinese Society of Pathology, Chinese Anti-Cancer Association; Digestive Disease Group, Chinese Society of Pathology, Chinese Medical Association; Chinese Society of Surgery, Chinese Medical Association; Chinese Society of Clinical Oncology, Chinese Anti-Cancer Association; Pathological Group of Hepatobiliary Tumor and Liver Transplantation, Chinese Society of Pathology, Chinese Medical Association) was created for the formulation of the first guidelines for the standardization of the pathological diagnosis of PLC, mainly focusing on the following topics: gross specimen sampling, concepts and diagnostic criteria of small hepatocellular carcinoma(SHCC), microvascular invasion(MVI), satellite nodules,and immunohistochemical and molecular diagnosis. The present updated guidelines are reflective of current clinicopathological studies, and include a novel 7-point baseline sampling protocol, which stipulate that at least four tissue specimens should be sampled at the junction of the tumor and adjacent liver tissues in a 1:1 ratio at the 12, 3, 6 and 9 o’clock reference positions. For the purposes of molecular pathological examination, at least one specimen should be sampled at the intratumoral zone, but more specimens should be sampled for tumors harboring different textures or colors. Specimens should be sampled at both adjacent and distant peritumoral liver tissues or the tumor margin in order to observe MVI, satellite nodules and dysplastic foci/nodules distributed throughout the background liver tissues. Complete sampling of whole SHCC ≤ 3 cm should be performed to assess its biological behavior, and in clinical practice, therapeutic borders should be also preserved, even in SHCC. The diagnostic criteria of MVI and satellite nodules, immunohistochemical panels, as well as molecular diagnostic principles, such as clonal typing, for recurrent HCC and multinodule HCC were also proposed and recommended. The standardized process of pathological examination is aimed at ensuring the accuracy of pathological PLC diagnoses as well as providing a valuable frame of reference for the clinical assessment of tumor invasive potential, the risk of postoperative recurrence, long-term survival, and the development of individualized treatment regimens. The updated guidelines could ensure the accuracy of pathological diagnoses of PLC, and provide a valuable frame of reference for its clinical assessment.
Purpose
The crucial role of knowledge sharing in an organization has become even more crucial lately, resulting in garnering more attention by scholars. In reality, while several organizations expect ...their employees to share knowledge with colleagues actively, many choose to hide their knowledge when asked for help. This study aims to explore whether negative workplace gossip (NWG) affects employee knowledge hiding (KH), as well as analyzes whether relational identification (RI) and interpersonal trust (IT) play a chain mediating role between the two, and discusses whether forgiveness climate (FC) could be used as a boundary condition in the relationships mentioned above.
Design/methodology/approach
Based on the conservation of resource (COR) theory and the cognitive–affective personality system (CAPS) theory, the authors surveyed 326 employees in China at 2 time-points and explored the correlation between NWG and KH, as well as the underlying mechanism. Using confirmatory factor analysis, bootstrapping method and structural equation model, the authors validated the research hypotheses.
Findings
The findings revealed the following: NWG negatively correlates with KH; RI and IT play a mediation role between NWG and KH, respectively, and both variables also play a chain mediation role in the relationship mentioned above; and FC moderates the negative impact of NWG on RI, further moderating the chain mediation between RI and IT and between NWG and KH.
Originality/value
First, this study established the correlation between NWG and KH, as well as analyzed the internal mechanism between the two. Besides, this study adds to scholars’ understanding of the underlying mechanisms by which these effects could occur. Second, this study demonstrated the moderating effect of FC – a situational feature that has been neglected in previous studies. Furthermore, this study can not only complement the situational factors ignored in previous studies but also broaden the application scope of CAPS. Finally, this study effectively combines COR and CAPS, which provides a basis for the application of these two theories in the future.
According to quantum mechanics, chiral states cannot be non-degenerate eingenstates of a parity-conserving Hamiltonian. This is in contradiction to the existence of chiral molecules—a fact known as ...as the Hund paradox1. The origin of molecular and biological chirality is conjectured to be related to parity-breaking interactions2,3 or environmental decoherence4, but a quantum superposition of two chiral molecular states with distinctive optical activities has never been observed5. To make progress in addressing these questions, it would be helpful to construct an artificial quantum system that breaks the parity symmetry and that can be prepared in a superposition of two chiral states. Here we report the synthesis of the parity-breaking antisymmetric spin exchange interaction in all-to-all connected superconducting circuits, which allows us to show various chiral spin dynamics in up to five-spin clusters. We also demonstrate the entanglement of up to five qubits in Greenberger–Horne–Zeilinger states based on a three-spin chiral logic gate. Our results are a step towards quantum simulation of magnetism with antisymmetric spin exhange interaction and quantum computation with chiral spin states.Parity-breaking antisymmetric spin exchange interaction is reported in clusters of five qubits within superconducting circuits. This allows the creation of chiral spin dynamics, with potential for future quantum simulations of chiral molecules.
Residue‐selective bioconjugation methods for biomolecules are highly sought to expand the scope of their biological and medical applications. Inspired by the mechanism of the generation of natural ...vinylogous γ‐pyridones (vPDNs), we have developed a novel unique azaphilone‐based, activation‐free primary‐amine‐selective bioconjugation method for biomolecules. Our strategy allows facile functionalization of primary amine groups in peptides and proteins, including the clinically used therapeutic antibody trastuzumab, by generating a highly stable vPDN linkage. Excellent chemoselectivity toward primary amines also enables the azaphilone derivatives to specifically modify the lipid components of Gram‐positive bacteria while bypassing Gram‐negative bacteria and mammalian cells. The new method shows significant advantages including chemoselectivity, efficiency, flexibility and biocompatibility, and therefore provides a valuable addition to the current toolbox for biomolecule conjugation.
Inspired by the unique natural reaction of azaphilones with amines, an efficient, highly chemoselective and activation‐free primary amine bioconjugation protocol has been developed and demonstrated in a variety of applications.
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