275 research outputs found
A Feasible Semi-quantum Private Comparison Based on Entanglement Swapping of Bell States
Semi-quantum private comparison (SQPC) enables two classical users with
limited quantum capabilities to compare confidential information using a
semi-honest third party (TP) with full quantum power. However, entanglement
swapping, as an important property of quantum mechanics in previously proposed
SQPC protocols is usually neglected. In this paper, we propose a feasible SQPC
protocol based on the entanglement swapping of Bell states, where two classical
users do not require additional implementation of the semi-quantum key
distribution protocol to ensure the security of their private data. Security
analysis shows that our protocol is resilient to both external and internal
attacks. To verify the feasibility and correctness of the proposed SQPC
protocol, we design and simulate the corresponding quantum circuits using IBM
Qiskit. Finally, we compare and discuss the proposed protocol with previous
similar work. The results reveal that our protocol maintains high qubit
efficiency, even when entanglement swapping is employed. Consequently, our
proposed approach showcases the potential applications of entanglement swapping
in the field of semi-quantum cryptography.Comment: 17 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2210.0342
A hybrid quantum-classical classifier based on branching multi-scale entanglement renormalization ansatz
Label propagation is an essential semi-supervised learning method based on
graphs, which has a broad spectrum of applications in pattern recognition and
data mining. This paper proposes a quantum semi-supervised classifier based on
label propagation. Considering the difficulty of graph construction, we develop
a variational quantum label propagation (VQLP) method. In this method, a
locally parameterized quantum circuit is created to reduce the parameters
required in the optimization. Furthermore, we design a quantum semi-supervised
binary classifier based on hybrid Bell and bases measurement, which has
shallower circuit depth and is more suitable for implementation on near-term
quantum devices. We demonstrate the performance of the quantum semi-supervised
classifier on the Iris data set, and the simulation results show that the
quantum semi-supervised classifier has higher classification accuracy than the
swap test classifier. This work opens a new path to quantum machine learning
based on graphs
Method for Thermo-optic Analysis in a Star Sensor
An autonomous star sensor is a highly accurate attitude-measuring instrument used in spacecraft, and its performance is restricted by ambient temperature of the outer space. This paper puts forward an effective scheme to the thermooptic analysis using finite element analysis (FEA) and ray tracing in star sensor. Specific difficulties: (a) how to evaluate thermo-optic effect in star sensor, and (b) how to make FEA results useful in optical design mode have been resolved using the scheme. Based on this scheme, the errors of star sensor, which are caused by thermo-optic effects, can be investigated in any complicated temperature condition, and the required temperature scope for the thermal design can be achieved. For example, the errors of the star sensor were 0.0863" and 2.2933", when the temperature differences of the experimental optical system were 10 °C and 5 °C in axial and lateral, respectively.Defence Science Journal, 2010, 60(3), pp.276-281, DOI:http://dx.doi.org/10.14429/dsj.60.35
Semi-quantum private comparison and its generalization to the key agreement, summation, and anonymous ranking
Semi-quantum protocols construct connections between quantum users and
``classical'' users who can only perform certain ``classical'' operations. In
this paper, we present a new semi-quantum private comparison protocol based on
entangled states and single particles, which does not require pre-shared keys
between the ``classical'' users to guarantee the security of their private
data. By utilizing multi-particle entangled states and single particles, our
protocol can be easily extended to multi-party scenarios to meet the
requirements of multiple ``classical'' users who want to compare their private
data. The security analysis shows that the protocol can effectively prevent
attacks from outside eavesdroppers and adversarial participants. Besides, we
generalize the proposed protocol to other semi-quantum protocols such as
semi-quantum key agreement, semi-quantum summation, and semi-quantum anonymous
ranking protocols. We compare and discuss the proposed protocols with previous
similar protocols. The results show that our protocols satisfy the demands of
their respective counterparts separately. Therefore, our protocols have a wide
range of application scenarios.Comment: 19 pages 5 table
10,11,12,13-Tetrahydro-4,5,9,14-tetraÂazadibenz[a,c]anthracene–benzene-1,4-dicarboxylic acid (2/1)
In the title adduct, 2C18H14N4·C8H6O4, the centrosymmetric 1,4-benzeneÂdicarboxylic acid molÂecule makes two O—H⋯·N hydrogen bonds to adjacent 10,11,12,13-tetraÂhydro-4,5,9,14-tetraÂazadibenzo[a,c]anthracene (TTBT) molÂecules. Aromatic π–π stacking interÂactions occur between TTBT rings [centroid–centroid distance = 3.570 (3) Å], leading to a two-dimensional supraÂmolecular structure in the crystal
Focal Adjustment for Star Tracker
Technique of measuring intensity distribution and size of spot image developed has been discussed, which is especially suitable for defocus adjustment in ground test of star tracker. A novel approach for choosing a proper defocusing position has been proposed based on collimator, Gaussian surface fitting method, and other ordinary instruments. It proves to be practical and adequate in the development of distant object tracking such as star tracker.Defence Science Journal, 2010, 60(6), pp.678-682, DOI:http://dx.doi.org/10.14429/dsj.60.3
Effects of Astragalus
This paper studied the chronic fatigue induced by excessive exercise and the restoration effects of Astragalus polysaccharides (APS) on mitochondria. In vivo, we found that excessive exercise could cause oxidative stress statue which led to morphological and functional changes of mitochondria. The changes, including imbalance between mitochondria fusion-fission processes, activation of mitophagy, and decrease of PGC-1α expression, could be restored by APS. We further confirmed in vitro, and what is more, we found that APS may ameliorate mitochondrial dysfunction through Sirt1 pathway. Based on the results, we may figure out part of the molecular mechanism of mitochondrial amelioration by APS
Preventive effect of Ibrolipim on suppressing lipid accumulation and increasing lipoprotein lipase in the kidneys of diet-induced diabetic minipigs
<p>Abstract</p> <p>Background</p> <p>The role of renal lipoprotein lipase (LPL) <it>per se </it>in kidney diseases is still controversial and obscure. The purpose of this study was to observe the preventive effects of Ibrolipim, a LPL activator, on lipid accumulation and LPL expression in the kidneys of minipigs fed a high-sucrose and high-fat diet (HSFD).</p> <p>Methods</p> <p>Male Chinese Bama minipigs were fed a control diet or HSFD with or without 0.1 g/kg/day Ibrolipim for 5 months. Body weight, plasma glucose, insulin, lipids, LPL activity, and urinary microalbumin were measured. Renal tissue was obtained for detecting LPL activity and contents of triglyceride and cholesterol, observing the renal lipid accumulation by Oil Red O staining, and examining the mRNA and protein expression of LPL by real time PCR, Western Blot and immunohistochemistry.</p> <p>Results</p> <p>Feeding HSFD to minipigs caused weight gain, hyperglycemia, hyperinsulinemia, hyperlipidemia and microalbuminuria. HSFD increased plasma LPL activity while it decreased the mRNA and protein expression and activity of LPL in the kidney. The increases in renal triglyceride and cholesterol contents were associated with the decrease in renal LPL activity of HSFD-fed minipigs. In contrast, supplementing Ibrolipim into HSFD lowered body weight, plasma glucose, insulin, triglyceride and urinary albumin concentrations while it increased plasma total cholesterol and HDL-C. Ibrolipim suppressed the renal accumulation of triglyceride and cholesterol, and stimulated the diet-induced down-regulation of LPL expression and activity in the kidney.</p> <p>Conclusions</p> <p>Ibrolipim exerts renoprotective and hypolipidemic effects <it>via </it>the increase in renal LPL activity and expression, and thus the increased expression and activity of renal LPL play a vital role in suppressing renal lipid accumulation and ameliorating proteinuria in diet-induced diabetic minipigs.</p
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