3,274 research outputs found
Robust interface between flying and topological qubits
Hybrid architectures, consisting of conventional and topological qubits, have
recently attracted much attention due to their capability in consolidating the
robustness of topological qubits and the universality of conventional qubits.
However, these two kinds of qubits are normally constructed in significantly
different energy scales, and thus this energy mismatch is a major obstacle for
their coupling that supports the exchange of quantum information between them.
Here, we propose a microwave photonic quantum bus for a direct strong coupling
between the topological and conventional qubits, in which the energy mismatch
is compensated by the external driving field via the fractional ac Josephson
effect. In the framework of tight-binding simulation and perturbation theory,
we show that the energy splitting of the topological qubits in a finite length
nanowire is still robust against local perturbations, which is ensured not only
by topology, but also by the particle-hole symmetry. Therefore, the present
scheme realizes a robust interface between the flying and topological qubits.
Finally, we demonstrate that this quantum bus can also be used to generate
multipartitie entangled states with the topological qubits.Comment: Accepted for publication in Scientific Report
Global and partitioned reconstructions of undirected complex networks
It is a significant challenge to predict the network topology from a small
amount of dynamical observations. Different from the usual framework of the
node-based reconstruction, two optimization approaches (i.e., the global and
partitioned reconstructions) are proposed to infer the structure of undirected
networks from dynamics. These approaches are applied to evolutionary games
occurring on both homogeneous and heterogeneous networks via compressed
sensing, which can more efficiently achieve higher reconstruction accuracy with
relatively small amounts of data. Our approaches provide different perspectives
on effectively reconstructing complex networks.Comment: 6 pages, 2 figures, 1 table; revised version; added numerical results
of the PR in Table 1 and expanded Section 4; added 7 reference
Transplantation of artificial gelatin-co-bletillastriata gelatin/Salvia miltiorrhiza Corium promotes dermal repair in rats
Purpose: To evaluate the growth of the composite corium (constructed with fibroblast cells and gelatinco- Bletillastriata gelatin/Salvia miltiorrhiza materials) on rats.Methods: The composite artificial corium was constructed by culturing fibroblast cells in gelatin-co- Bletillastriata gelatin/Salvia miltiorrhiza materials. Full-thickness area of skin was excised from the mice and subsequently, the composite corium was transplanted on the wound. Thereafter, the growth difference of the composite artificial corium and natural corium were compared. In addition, real-time fluorogenic reverse transcription polymerase chain reaction (qRT-PCR) and western blot were performed to determine vascular endothelial growth factor (VEGF) expression at gene and protein levels.Results: The composite artificial corium showed significant repair promoting effect on the skin, and the structure of the repaired skin was similar to that of natural corium. Interestingly, PCR and western blot results showed that the expressions of VEGF were higher in composite artificial corium than in natural corium on days 3 and 7 post-transplantation.Conclusion: The composite artificial corium has some clinical prospects for use in the treatment of wounds on large areas of skin.Keywords: Tissue engineering, Corium, Gelatin-co-Bletillastriata, Gelatin, Salvia miltiorrhiza, Vascularization, Vascular endothelial growth factor, VEGF
Electronic Landscape of Kagome Superconductors VSb ( = K, Rb, Cs): A Perspective from Angle-Resolved Photoemission Spectroscopy
The recently discovered layered kagome superconductors
VSb ( = K, Rb, Cs) have garnered
significant attention, as they exhibit an intriguing combination of
superconductivity, charge density wave (CDW) order, and nontrivial band
topology. As such, these kagome systems serve as an exceptional quantum
platform for investigating the intricate interplay between electron correlation
effects, geometric frustration, and topological electronic structure. A
comprehensive understanding of the underlying electronic structure is crucial
for unveiling the nature and origin of the CDW order, as well as determining
the electron pairing symmetry in the kagome superconductors. In this review, we
present a concise survey of the electronic properties of
VSb, with a particular focus on the insights derived
from angle-resolved photoemission spectroscopy (ARPES). Through the lens of
ARPES, we shed light on the electronic characteristics of the kagome
superconductors VSb, which will pave the way for
exciting new research frontiers in kagome-related physics.Comment: This review paper is currently under review, and we eagerly await any
comments or feedbac
Rapid Dynamics of Contrast Responses in the Cat Primary Visual Cortex
The visual information we receive during natural vision changes rapidly and continuously. The visual system must adapt to the spatiotemporal contents of the environment in order to efficiently process the dynamic signals. However, neuronal responses to luminance contrast are usually measured using drifting or stationary gratings presented for a prolonged duration. Since motion in our visual field is continuous, the signals received by the visual system contain an abundance of transient components in the contrast domain. Here using a modified reverse correlation method, we studied the properties of responses of neurons in the cat primary visual cortex to different contrasts of grating stimuli presented statically and transiently for 40 ms, and showed that neurons can effectively discriminate the rapidly changing contrasts. The change in the contrast response function (CRF) over time mainly consisted of an increment in contrast gain (CRF shifts to left) in the developing phase of temporal responses and a decrement in response gain (CRF shifts downward) in the decay phase. When the distribution range of stimulus contrasts was increased, neurons demonstrated decrement in contrast gain and response gain. Our results suggest that contrast gain control (contrast adaptation) and response gain control mechanisms are well established during the first tens of milliseconds after stimulus onset and may cooperatively mediate the rapid dynamic responses of visual cortical neurons to the continuously changing contrast. This fast contrast adaptation may play a role in detecting contrast contours in the context of visual scenes that are varying rapidly
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