Hierarchical quantum-information splitting

We present a scheme for asymmetric quantum-information splitting, where a sender distributes asymmetrically a quantum secret (quantum state) to distant partners in a network. The asymmetric distribution leads to that the partners have different powers to recover the sender’s secret. In other words, their authorities for getting the secret are hierarchized. In the scheme, the partners do not need to make any nonlocal operation. The scheme can also be modified to implement threshold-controlled teleportation.     

Generalised splitting of spacetime

Normally, when a spacetime splitting is considered the ADM 3+1 split is brought to mind. In this paper, the idea of spacetime splitting is extended to include anm + n splitting of spacetime. The global spacetime has dimension (m + n) and the foliating spaces have dimensionm. There aren independent normals to each of these foliating spaces, thus givingn different extrinsic curvatures. The generalised Gauss-Weingarten and the generalised Gauss-Codazzi equations associated with this splitting are derived. These generalised equations reduce to the familar ADM equations when a 3+1 split is considered. The generalised equations are found to have a particularly elegant form when an orthogonal splitting of spacetime is examined.     

Finite-bias Cooper pair splitting

In a device with a superconductor coupled to two parallel quantum dots (QDs) the electrical tunability of the QD levels can be used to exploit nonclassical current correlations due to the splitting of Cooper pairs. We experimentally investigate the effect of a finite potential difference across one quantum dot on the conductance through the other completely grounded QD in a Cooper pair splitter fabricated on an InAs nanowire. We demonstrate that the nonlocal electrical transport through the device can be tuned by electrical means and that the energy dependence of the effective density of states in the QDs is relevant for the rates of Cooper pair splitting (CPS) and elastic cotunneling. Such experimental tools are necessary to understand and develop CPS-based sources of entangled electrons in solid-state devices.     

可调分束角棱镜分束光强比研究

利用相位匹配条件,坐标转换和菲涅耳公式推导出了可调分束角棱镜的光强分束比的数学表达式,分析了光束的入射角、棱镜的结构角,以及入射波长对光强分束比的影响,给出了使光强分束比为1的条件,并进行了实验测试,测试结果与理论分析相一致,为设计出射光强相等或近似相等的可调分束角棱镜提供了理论依据。     

Generalized model of giant-dipole-resonance splitting

A simple semimicroscopic model that makes it possible to take into account the deformation, configuration, and isospin splitting of a giant dipole resonance is formulated and is used to describe the gross structure of the photoabsorption cross section in spherical, deformed, and transition nuclei over the mass range 10 ? A ? 240.     

Soliton algebra by vortex-beam splitting

We experimentally demonstrate the possibility of breaking up intense vortex light beams into stable and controllable sets of parametric solitons. We report observations performed in seeded second-harmonic generation, but the scheme can be extended to all parametric processes. The number of generated solitons is shown to be determined by a robust arithmetic rule.     

Beam splitting on weak illumination

We demonstrate, in both two and three dimensions, how a self-guided beam in a non-Kerr medium is split into two beams on weak illumination. We also provide an elegant physical explanation that predicts the universal character of the observed phenomenon. Possible applications of our findings to guiding light with light are also discussed.     

Non-singlet splitting functions in QED

Iterative solution of QED evolution equations for non-singlet electron structure functions is considered. Analytical expressions in the fourth and fifth orders are presented in terms of splitting functions. Relation to the existing exponentiated solution is discussed.     

Combining and splitting relativistic strings

It is shown how the three-reggeon vertex of Ademollo, Del Guidice, Di Vecchia and Fubini is obtained from overlap conditions of three relativistic strings.     

Open systems of splitting particles

Systems with an infinite variety of types of splitting particles are investigated. It is shown that if there is a stationary source of particles but no sink, a steady state with finite density of each species is nevertheless possible due to the infinite number of degrees of freedom. It is demonstrated that the limiting (steady) state is independent of the initial state of the system. Typical features of the steady state, which do not depend on the particle splitting law, are shown.     

Effective interaction and isospin splitting

In view of the recently observed isospin splitting in giant dipole resonances in nuclei such as ¹¹B an attempt is made to understand such splittings from the view point of effective interactions. From the simple analysis of central forces it is found that while the Wigner and Bartlett exchange mixtures are irrelevant, the Majorana force (A_M) must contribute significantly compared to the Heisenberg force (A_H) and that (A_M+A_B) must always be positive. It is also necessary for the effective force to be of long range.     

用多粒子态进行量子信息分配

我们提出一个用五粒子态将量子信息分裂成几部分的方案。在这个过程中,如果且只有接受者相互合作才能重建初始比特的态。我们所用的量子通道是Bell太和三比特GHZ态的组合态,这些态在实验上都是很容易制备的。这个方案对某些窃听攻击来说是安全的。而且,它还可以用来实现控制的量子隐形传态。     

Signature splitting in 129Ce

The high spin states of 129Ce have been populated via heavy-ion fusion evaporation reaction 96Mo (37C1, 1p3n) 129Ce. The γ-γ coincidence and intensity balance used to measure the B(M1; I→I-1)/B(E2; I→I-2) (the probability ratio of the dipole and quadrupole transition) in v7/2[523] rotational band of 129Ce. And the energy splitting (Δe') has been got through the experimental Routhians. The lifetimes and quadrupole moments Qt have been extracted from the lineshape analyses using DSAM. The deformation of the v7/2[523] rotational band of 129Ce was extracted from the Qt and moment of inertia JRR.