Universal linear Bogoliubov transformations through one-way quantum computation

We show explicitly how to realize an arbitrary linear unitary Bogoliubov transformation (LUBO) on a multi-mode quantum state through homodyne-based one-way quantum computation. Any LUBO can be approximated by means of a fixed, finite-sized, sufficiently squeezed Gaussian cluster state that allows for the implementation of beam splitters (in form of three-mode connection gates) and general one-mode LUBOs. In particular, we demonstrate that a linear four-mode cluster state is a sufficient resource for an arbitrary one-mode LUBO. Arbitrary input quantum states including non-Gaussian states could be efficiently attached to the cluster through quantum teleportation.Comment: 10 pages, 6 figure

Atomic scale localization of Kohn-Sham wavefunction at SiO2/4H-SiC interface under electric field, deviating from envelope function by effective mass approximation

To clarify the cause of the low channel conductivity at the SiO2/4H-SiC interface, the wavefunction at the SiC conduction band minimum was calculated using density functional theory under an applied electric field. We found that the wavefunction for a 4H-SiC (0001) slab tends to be localized at the cubic site closest to the interface. Importantly, because the conduction electrons are distributed closer to the interface (< 5 angstroms) than expected from the effective mass approximation (EMA), they are more frequently scattered by interface defects. This is expected to be the reason why the channel conductivity for the (0001) face is particularly low compared with that for other faces, such as (11-20). The breakdown of the EMA for the (0001) interface is related to the long structural periodicity along the [0001] direction in 4H-SiC crystals

The lurking potential of tangential forces: A case of an arteriovenous shunt developed by percutaneous coronary intervention for the septal branch

SummaryWe describe the case of a 59-year-old male. His first percutaneous coronary intervention (PCI) using a bare metal stent was performed for a 90% stenosis in the mid portion of the left anterior descending artery (LAD). However, we performed re-PCI because in-stent restenosis developed during a chronic stage. After the first dilatation of the restenotic lesion, using a cutting balloon, the stenosis at the ostium of the septal branch, which takes off from the stent strut, became exacerbated. Therefore, after selective guidewire insertion to the septal branch, we performed balloon inflation. Unfortunately, a coronary dissection and perforation developed in the septal branch and a coronary arteriovenous shunt was also formed. Additional inflation for in-stent restenosis with a perfusion balloon provided successful occlusion of the ostium of the septal branch and the shunt flow disappeared. After careful re-selection of a guide wire into the septal branch, the perforated portion was then dilated using a small-sized conventional balloon. Finally, reperfusion of the septal branch was accomplished without any angiographic sign of coronary dissection, perforation or shunt. We herein report a rare case of coronary arteriovenous shunt formation due to the dissection and perforation of a coronary artery

語の意味発達 : 最近の研究動向から

国立国語研究所17の書名 : 国立国語研究所研究報告

A case of pulmonary stenosis after a repair for tetralogy of Fallot treated with percutaneous pulmonary valvuloplasty using a triple-balloon technique

SummaryThe patient was a 37-year-old female who had undergone a repair for tetralogy of Fallot (TOF) at the age of 4 years. Postoperative pulmonary stenosis remained, but she continued to be managed medically. Approximately 3 years ago, at the age of 34, she exhibited a worsening of fatigue and dyspnea during exertion (New York Heart Association III), and was therefore hospitalized for a detailed examination. In cardiac catheterization, a right ventricle to pulmonary artery peak-to-peak gradient of about 90mmHg was observed. Since it appeared that medical treatment alone would not sufficiently control her heart failure, pulmonary valvuloplasty using a triple-balloon technique was performed for the pulmonary stenosis. The peak-to-peak gradient immediately after the procedure decreased to 13mmHg. There were no indications of restenosis approximately 6 months after the procedure, and the symptoms of heart failure in her daily life improved thereafter

Demonstration of unconditional one-way quantum computations for continuous variables

Quantum computing promises to exploit the laws of quantum mechanics for processing information in ways fundamentally different from today's classical computers, leading to unprecedented efficiency. One-way quantum computation, sometimes referred to as the cluster model of quantum computation, is a very promising approach to fulfil the capabilities of quantum information processing. The cluster model is realizable through measurements on a highly entangled cluster state with no need for controlled unitary evolutions. Here we demonstrate unconditional one-way quantum computation experiments for continuous variables using a linear cluster state of four entangled optical modes. We implement an important set of quantum operations, linear transformations, in the optical phase space through one-way computation. Though not sufficient, these are necessary for universal quantum computation over continuous variables, and in our scheme, in principle, any such linear transformation can be unconditionally and deterministically applied to arbitrary single-mode quantum states.Comment: 9 pages, 3 figure