278 research outputs found
Quantum steering for continuous variable in de Sitter space
We study the distribution of quantum steerability for continuous variables
between two causally disconnected open charts in de Sitter space. It is shown
that quantum steerability suffers from "sudden death" in de Sitter space, which
is quite different from the behaviors of entanglement and discord because the
latter always survives and the former vanishes only in the limit of infinite
curvature. In addition, we find that the attainment of maximal steerability
asymmetry indicates a transition between unidirectional steerable and
bidirectional steerable. Unlike in the flat space, the asymmetry of quantum
steerability can be completely destroyed in the limit of infinite curvature for
the conformal and massless scalar fields in de Sitter space.Comment: 22 pages, 7 figure
Revolutionising health care: Exploring the latest advances in medical sciences
Recent years have seen a revolution in the domain of medical science, with ground-breaking discoveries changing health care as we once knew it [1]. These advances have considerably improved disease diagnosis, treatment, and management, improving patient outcomes and quality of life [2–5]. . .
Black-box estimation of expanding parameter for de Sitter universe
We study the black-box parameter estimation of expanding parameters and the
dynamics of Gaussian interferometric power for the de Sitter space. We find
that the state between separated open charts can be employed as probe state for
the black-box quantum metrology. This is nontrivial because the open charts are
causally disconnected and classical information can not be exchanged between
them according to the general relativity. It is shown that the mass of the
scalar field remarkably affects the accuracy of the black-box parameter
estimation in the de Sitter space, which is quite different from the flat space
case where the mass parameter does not influence the precision of estimation.
Quantum discord is found to be a key resource for the estimation of the
expanding parameter when there is no entanglement between the initially
uncorrelated open charts.It is demonstrated that the role of the probe state
between different open charts is quite distinct because curvature effect of the
de sitter space damages quantum resources for the initially correlated probe
states, while it generates quantum resources for the initially uncorrelated
probe states.Comment: 16 pages, 8 figure
Reap success from persistence
The road to success is long and arduous. Almost all Nobel prize laureates experienced tremendous efforts and countless failures before they made their scientific breakthroughs. Hypothesis-driven, independent and critical thinking, passion, repeated experiments and repetitive failures and running in circles on the entire scientific process finally approved their hypotheses
Quantum properties of fermionic fields in multi-event horizon spacetime
We investigate the properties of quantum entanglement and mutual information
in the multi-event horizon Schwarzschild-de Sitter (SdS) spacetime for massless
Dirac fields. We obtain the expression for the evolutions of the quantum state
near the black hole event horizon (BEH) and cosmological event horizon (CEH) in
the SdS spacetime. Under the Nariai limit, the physically accessible
entanglement and mutual information are maximized, and the physically
inaccessible correlations are zero. With the increase in temperature of either
horizon, the physically accessible correlations experience degradation.
Notably, the initial state remains entangled and can be utilized in
entanglement-based quantum information processing tasks, which differs form the
scalar field case. Furthermore, the degradation of physically accessible
correlations is more pronounced for small-mass black holes. In contrast, the
physically inaccessible correlations separated by the CEH monotonically
increase with the radiation temperature, and such correlations are not
decisively influenced by the effect of particle creation at the BEH. Moreover,
a similar phenomenon is observed for the inaccessible correlations separated by
the BEH. This result differs from the single event spacetime, in which the
physically inaccessible entanglement is a monotonic function of the Hawking
temperature.Comment: 14 pages, 7 figure
Gravity enhanced quantum spatial target detection
Quantum illumination can utilize entangled light to detect the
low-reflectivity target that is hidden in a bright thermal background. We apply
this technique to the detection of an object under the curved spacetime of the
Earth, and are especially interested in how the curvature of spacetime
influences the spatial quantum illumination. We find that in the near-Earth
curved spacetime, the spatial quantum illumination with entangled state
transmitter outperforms the one with coherent state transmitter. Furthermore,
whether the quantum illumination system or the coherent state system is
employed, the detection error-probability and the transmitted modes in the
curved spacetime case are always lower than those in the flat spacetime case.
That is to say, the Earth's gravity makes the spatial target detection more
efficient. This is because the effects of gravity on the illumination signal
beam can cancel each other out, while the thermal noise in the return signal is
reduced because of the gravitational effect.Comment: 16 pages, 5 figure
Rosavin exerts an antitumor role and inactivates the MAPK/ERK pathway in small-cell lung carcinoma in vitro
This study attempts to explore the function and mechanism of action of rosavin in small-cell lung cancer (SCLC) in vitro. The viability and clone formation of SCLC cells were assessed using cell counting kit-8 and colony formation assays, respectively. Apoptosis and cell cycle were detected using flow cytometry and cell cycle analysis, respectively. Wound healing and transwell assays were performed to evaluate the migration and invasion of SCLC cells. Besides, protein levels of p-ERK, ERK, p-MEK and MEK were determined using western blot analysis. Rosavin repressed the viability and clone formation of SCLC cells, and promoted apoptosis and G0/G1 arrest of SCLC cells. At the same time, rosavin suppressed migration and invasion of SCLC cells. Moreover, protein levels of p-ERK/ERK and p-MEK/MEK were decreased after rosavin addition in SCLC cells. Rosavin impaired malignant behaviors of SCLC cells, which may be associated with inhibition of the MAPK/ERK pathway in vitro
Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales
Biological surfaces with unique wettability in nature have provided an enormous innovation for scientists and engineers. More specifically, materials possessing various wetting properties have drawn considerable attention owing to their promising application prospects. Recently, great efforts have been concentrated on the researches on wetting-induced drag-reduction materials inspired by biology because of their ability to save energy. In this work, the drag-reduction characteristics of the bionic surface with delicate water-trapping microstructures of fish Ctenopharyngodon idellus scales were explored by experimental method. Firstly, the resistance of smooth surface and bionic surface experimental sample at different speeds was carefully tested through the testing system for operation resistance. Then, the contact angle (CA) of fish scale surface was measured by means of the contact angle measuring instrument. It was discovered that the bionic surface created a rewarding drag-reduction effect at a low speed, and the drag-reduction rate significantly displayed a downward trend with the increase in flow speed. Thus, when the rate was 0.66 m/s, the drag-reduction effect was at the optimum level, and the maximum drag reduction rate was 2.805%, which was in concordance with the simulated one. Furthermore, a contact angle (CA) of 11.5° appeared on the fish scale surface, exhibiting fine hydrophilic property. It further manifested the spreading-wetting phenomenon and the higher surface energy for the area of apical of fish scales, which played an important role in drag-reduction performance. This work will have a great potential in the engineering and transportation field
The integration path and promotion of new business majors and ideological and political education in the era of great changes
The world is experiencing unprecedented changes, and from historical experience, the era of great changes often means opportunities and challenges. To seize opportunities and better meet challenges, talent is indispensable. Ideological and political education is a very important component of achieving the goal of "cultivating morality and talents" in universities, and it is also a very important way to improve the quality of talent cultivation. Therefore, the article studies the necessity and integration path of ideological and political education in new business majors in the era of great changes, and proposes promotion strategies for the integration of new business majors and ideological and political education, in order to help them better achieve integration in the era of great changes
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