Quantum computing is an emerging and promising research field in modern quantum physics and is committed to accelerating traditional calculation processes using the principle of quantum mechanics[1,2].Several computation models have been proposed,including the circuit model[3],topologic quantum computation[4],adiabatic quantum computing[5],and duality quantum computing[6-8].Universal quantum computation generally includes a system initialization,evolutionary control,and a final-state readout[9],where the preparation of the initial state is a key step in the entire process. 相似文献
Let Gi be a closed Lie subgroup of U(n), Ωi be a bounded Gi-invariant domain in Cn which contains 0, and \(O{\left( {{\mathbb{C}^n}} \right)^{{G_i}}} = \mathbb{C}\), for i = 1; 2. If f: Ω1 → Ω2 is a biholomorphism, and f(0) = 0, then f is a polynomial mapping (see Ning et al. (2017)). In this paper, we provide an upper bound for the degree of such polynomial mappings. It is a natural generalization of the well-known Cartan’s theorem. 相似文献
We calculate the high energy afterglow emission from short Gamma-Ray Bursts (SGRBs) in the external shock model. There are two possible components contributing to the high energy afterglow: electron synchrotron emission and synchrotron self-Compton (SSC) emission. We find that for typical parameter values of SGRBs, the early high-energy afterglow emission in 10 MeV-10 GeV is dominated by synchrotron emission. For a burst occurring at redshift z = 0.1, the high-energy emission can be detectable by Fermi LAT if the blast wave has energy E ⩾ 1051 ergs and the fraction of electron energy ɛe ⩾ 0.1. This provides a possible explanation for the high energy tail of SGRB 081024B.
In this study,ultrasound grating was used to measure the sound velocity in solutions of ethylene glycol and polyethylene glycol with molecular weights of 200,600,2000,and 10000.We found Parthasarathy empirical rule,that is,sound velocity is higher in the solution of larger molecules,is invalid in the case of polyethylene glycol solution. We tried to provide a tentative explanation using the Flory-Krigbaum's chained block cloud model. 相似文献
This paper studies the problem of a functionally graded piezoelectric circular plate subjected to a uniform electric potential
difference between the upper and lower surfaces. By assuming the generalized displacements in appropriate forms, five differential
equations governing the generalized displacement functions are derived from the equilibrium equations. These displacement
functions are then obtained in an explicit form, which still involve four undetermined integral constants, through a step-by-step
integration which properly incorporates the boundary conditions at the upper and lower surfaces. The boundary conditions at
the cylindrical surface are then used to determine the integral constants. Hence, three-dimensional analytical solutions for
electrically loaded functionally graded piezoelectric circular plates with free or simply-supported edge are completely determined.
These solutions can account for an arbitrary material variation along the thickness, and thus can be readily degenerated into
those for a homogenous plate. A numerical example is finally given to show the validity of the analysis, and the effect of
material inhomogeneity on the elastic and electric fields is discussed.
Supported by the National Natural Science Foundation of China (Grant Nos. 10472102 and 10432030) and the Specialized Research
Fund for the Doctoral Program of Higher Education of China (Grant No. 20060335107) 相似文献
A novel and simple procedure for the enantiospecific synthesis of penehyclidine hydrochloride (8018) isomers and the R configuration derivatives was described. The intramolecular asymmetric cyclization of the monosulfonate of compound 1,2-diol was applied to the execution of the synthesis of the key chiral building block for the first time. The aimed products were obtained with moderate yield in〉99% ee. 相似文献
This paper addresses the learning algorithm on the unit sphere. The main purpose is to present an error analysis for regression generated by regularized least square algorithms with spherical harmonics kernel. The excess error can be estimated by the sum of sample errors and regularization errors. Our study shows that by introducing a suitable spherical harmonics kernel, the regularization parameter can decrease arbitrarily fast with the sample size. 相似文献