36 research outputs found
Quantum steering for two-mode states with Continuous-variable in laser channel
The Einstein-Podolsky-Rosen steering is an important resource for one-sided
device independent quantum information processing. This steering property will
be destroyed during the interaction between quantum system and environment for
some practical applications. In this paper, we use the representation of
characteristic function for probability to examine the quantum steering of
two-mode states with continuous-variable in laser channel, where both the gain
factor and the loss effect are considered. Firstly, we analyse the steering
time of two-mode squeezed vacuum state under one-mode and two-mode laser
channel respectively. We find the gain process will introduce additional noise
to the two-mode squeezed vacuum state such that the steerable time is reduced.
Secondly, by quantising quantum Einstein-Podolsky-Rosen steering, it shows that
two-side loss presents a smaller steerability than one-side loss although they
share the same two-way steerable time. In addition, we find the more gained
party can steer the others state, while the other party cannot steer the gained
party in a certain threshold value. In this sense, it seems that the gain
effect in one party is equivalent to the loss effect in the others party. Our
results pave way for the distillation of Einstein-Podolsky-Rosen steering and
the quantum information processing in practical quantum channels
Distillation of Gaussian Einstein-Podolsky-Rosen steering with noiseless linear amplification
Einstein-Podolsky-Rosen (EPR) steering is one of the most intriguing features
of quantum mechanics and an important resource for quantum communication. The
inevitable loss and noise in the quantum channel will lead to decrease of the
steerability and turn it from two-way to one-way. Despite an extensive research
on protecting entanglement from decoherence, it remains a challenge to protect
EPR steering due to its intrinsic difference from entanglement. Here, we
experimentally demonstrate the distillation of Gaussian EPR steering in lossy
and noisy environment using measurement-based noiseless linear amplification.
Our scheme recovers the two-way steerability from one-way in certain region of
loss and enhances EPR steering for both directions. We also show that the
distilled EPR steering allows to extract secret key in one-sided
device-independent quantum key distribution. Our work paves the way for quantum
communication exploiting EPR steering in practical quantum channels
Modified Primary Anastomosis Using an Intestinal Internal Drainage Tube for Crohn’s Disease: A Pilot Study
Purpose: Surgical treatment is an important part of the management of Crohn’s disease (CD). However, the current recommended staged procedures require two operations, with long hospital stays and high costs, while traditional primary anastomosis has a high risk of complications. Therefore, the aim of this study was to compare the clinical efficacy and safety of modified primary anastomosis using intestinal internal drainage tubes for CD. Methods: In this study, emergency and nonemergency CD patients were included separately. Then, the patients were divided into three subgroups: patients with intestinal internal drainage tubes (modified primary anastomosis), staged procedures, and traditional primary anastomosis. The main outcomes were the number of hospitalizations, length and cost of the first hospital stay, length and cost of total hospital stays, and complications. Results: The outcomes of the three subgroups of emergency CD patients were not significantly different. For nonemergency CD patients, patients with intestinal internal drainage tubes had shorter total hospital stays and fewer hospitalizations compared with the staged procedures subgroup, while no significant differences in any outcomes were observed between the modified and traditional primary anastomosis subgroups. Conclusions: For emergency CD patients, no significant advantage in terms of the main outcomes was observed for modified primary anastomosis. For nonemergency CD patients, modified primary anastomosis reduced the length of total hospital stays and hospitalizations compared with staged procedures. The placement of intestinal internal drainage tubes allows some patients who cannot undergo primary anastomosis to undergo it, which is a modification of traditional primary anastomosis
Effects of Exogenous Phthalic Acid on Seed Germination, Root Physiological Characteristics, and Mineral Element Absorption of Watermelon
To understand the effect of exogenous PA on the watermelon root system, the watermelon variety ‘Zaojia 84–24’ was used as experimental material. This study investigated the effects of allelochemicals DIBP and DOP at varying different concentrations (0, 0.05, 0.1, 0.5, 1, and 4 mmol·L−1) on the physiological characteristics and mineral content of watermelon roots. The results revealed that proper PA treatment concentrations (0.05~0.1 mmol·L−1) promoted seed germination, increased the number of RBCs and the survival rate of RBCs, and enhanced the activities of PME and dehydrogenase in watermelon roots. In addition, proper PA treatment concentrations (0.05~0.1 mmol·L−1) promoted the activities of SOD, POD, CAT, and NR in watermelon roots. The contents of MDA and soluble protein were increased at 0.05~4 mmol·L−1 PA. In addition, proper PA treatment concentrations promoted the absorption and accumulation of P, K, Ca, Fe, Cu, and Zn elements in watermelon roots. These results indicate that PA at a concentration of 0.05~0.5 mmol·L−1 can promote watermelon seed germination, improve antioxidant enzyme activity of watermelon roots, and maintain normal physiological activities of watermelon by affecting absorption and accumulation of mineral elements in the root system