Bottomonium Spectrum with Screened Potential

As a sister work of Ref.[1], we incorporate the color-screening effect due to light quark pair creation into the heavy quark-antiquark potential, and investigate the effects of screened potential on the spectrum of bottomonium. We calculate the masses, electromagnetic decays, and E1 transitions of bottomonium states. We find that the fine splittings between $\chi_{bJ}$ (J=0,1,2) states are in good agreement with experimental data, and the E1 transition rates of $\Upsilon(2S)\to\gamma\chi_{bJ}(1P)$ and $\Upsilon(3S)\to\gamma\chi_{bJ}(2P)$ (J=0,1,2) all agree with data within experimental errors. In particular, the mass of $\Upsilon(6S)$ is lowered down to match that of the $\Upsilon(11020)$, which is smaller than the predictions of the linear potential models by more than 100 MeV. Comparison between charmonium and bottomonium in some related problems is also discussed.Comment: 9 pages, Commun. Theor. Phys. (in press

Improving the capacity of the ping-pong protocol

We present a quantum communication protocol which keeps all the properties of the ping-pong protocol [Phys. Rev. Lett. 89, 187902 (2002)] but improves the capacity doubly as the ping-pong protocol. Alice and Bob can use the variable measurement basises in control mode to detect Eve's eavesdropping attack. In message mode, Alice can use one unitary operations to encode two bits information. Bob only needs to perform a Bell type measurement to decode Alice's information. A classical message authentification method can protect this protocol against the eavesdropping hiding in the quantum channel losses and the denial-of-service (DoS) attack.Comment: 3page; PACS:03.67.Hk, 03.65.U

Nursing Care of Patients With Transcatheter Closure of Atrial Septal Defect via Femoral Vein

Objective: To explore the operative nursing coordination method for the treatment of congenital atrial septal defect (ASD) by transcatheter closure of atrial septal defect via femoral vein. It provides useful experience for the treatment of congenital heart disease. Methods a total of 12 patients undergoing minimally invasive atrial septal defect closure via femoral vein from January 2017 to November 2017 in our department of cardiac surgery were selected as the subjects. All patients received transesophageal ultrasound guided ASD occlusion by femoral vein. The operation and nursing contents include preoperative care, the cooperation of the itinerant nurses, the coordination of the instrument nurses and the postoperative nursing. Results the operation of 12 patients in this group was successful. The diameter of the occluder was 17.1 + 4.5mm during the operation. The time of tracheal intubation was 2.4 + 0.7h, from the femoral vein to the sheath tube time was 38.7 + 9.4min, the occupancy of ICU was 12.5 + 2.6h after the operation. The average time of hospitalization was 4.5 + 1.8D. There were 2 cases of shunt 1mm immediately after operation. After 24h reexamination, the shunt disappeared, the heart murmur disappeared in the rest of the patients. No residual shunt and other complications occurred

Time Evolution of Entanglement Entropy in Quenched Holographic Superconductors

We investigate the dynamical evolution of entanglement entropy in a holographic superconductor model by quenching the source term of the dual charged scalar operator. By access to the full background geometry, the holographic entanglement entropy is calculated for a strip geometry at the AdS boundary. It is found that the entanglement entropy exhibits a robust non-monotonic behaviour in time, independent of the strength of Gaussian quench and the size of the strip: it first displays a small dip, then grows linearly, and finally saturates. In particular, the linear growth velocity of the entanglement entropy has an upper bound for strip with large width; The equilibrium value of the non-local probe at late time shows a power law scaling behaviour with respect to the quench strength; Moreover, the entanglement entropy can uncover the dynamical transition at certain critical quench strength which happens to coincide with the one obtained form the dynamical evolution of scalar order parameter.Comment: 19 pages; 7 figures; compatible with JHEP versio

Quantum theory of light diffraction

At present, the theory of light diffraction only has the simple wave-optical approach. In this paper, we study light diffraction with the approach of relativistic quantum theory. We find that the slit length, slit width, slit thickness and wave-length of light have affected to the diffraction intensity and form of diffraction pattern. However, the effect of slit thickness on the diffraction pattern can not be explained by wave-optical approach, and it can be explained in quantum theory. We compare the theoretical results with single and multiple slits experiment data, and find the theoretical results are accordance with the experiment data. Otherwise, we give some theory prediction. We think all the new prediction will be tested by the light diffraction experiment.Comment: 10 page