scholarly journals Phase analysis on the error scaling of entangled qubits in a 53-qubit system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wei-Jia Huang ◽  
Wei-Chen Chien ◽  
Chien-Hung Cho ◽  
Che-Chun Huang ◽  
Tsung-Wei Huang ◽  
...  
Keyword(s):  
Excited States ◽  
Phase Trajectory ◽  
Trajectory Analysis ◽  
Operation Time ◽  
Noisy Environment ◽  
Gate Operation ◽  
Intermediate Scale ◽  
Entanglement Evolution ◽  
Qubit System ◽  
The Impact

AbstractWe have studied carefully the behaviors of entangled qubits on the IBM Rochester with various connectivities and under a “noisy” environment. A phase trajectory analysis based on our measurements of the GHZ-like states is performed. Our results point to an important fact that entangled qubits are “protected” against environmental noise by a scaling property that impacts only the weighting of their amplitudes. The reproducibility of most measurements has been confirmed within a reasonably short gate operation time. But there still are a few combinations of qubits that show significant entanglement evolution in the form of transitions between quantum states. The phase trajectory of an entangled evolution, and the impact of the sudden death of GHZ-like states and the revival of newly excited states are analyzed in details. All observed trajectories of entangled qubits arise under the influences of the newly excited states in a “noisy” intermediate-scale quantum (NISQ) computer.

scholarly journals Phase Analysis on the Error Scaling of Entangled Qubits in a 53-Qubit System

2021 ◽  
Author(s):  
Ching-Ray Chang ◽  
Wei-Jia Huang ◽  
Wei-Chen Chien ◽  
Chien-Hung Cho ◽  
Che-Chun Huang ◽  
...  
Keyword(s):  
Excited States ◽  
Phase Trajectory ◽  
Trajectory Analysis ◽  
Operation Time ◽  
Noisy Environment ◽  
Gate Operation ◽  
Intermediate Scale ◽  
Entanglement Evolution ◽  
Qubit System ◽  
The Impact

Abstract We have studied carefully the behaviors of entangled qubits on the IBM Rochester with various connectivities and under a “noisy” environment. A phase trajectory analysis based on our measurements of the GHZ-like states is performed. Our results point to an important fact that entangled qubits are “protected” against environmental noise by a scaling property that impacts only the weighting of their amplitudes. The reproducibility of most measurements has been confirmed within a reasonably short gate operation time. But there still are a few combinations of qubits that show significant entanglement evolution in the form of transitions between quantum states. The phase trajectory of an entangled evolution, and the impact of the sudden death of GHZ-like states and the revival of newly excited states are analyzed in details. All observed trajectories of entangled qubits arise under the influences of the newly excited states in a “noisy” intermediate-scale quantum (NISQ) computer.

scholarly journals Water Influence on the Uniaxial Tensile Behavior of Polytetrafluoroethylene-Coated Glass Fiber Fabric

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 846
Author(s):  
Hastia Asadi ◽  
Joerg Uhlemann ◽  
Natalie Stranghoener ◽  
Mathias Ulbricht
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Operation Time ◽  
Uniaxial Tensile ◽  
Membrane Structures ◽  
Strength Deterioration ◽  
Coated Glass ◽  
Reversible Loss ◽  
The Impact ◽  
Loss Of Strength

Polytetrafluoroethylene (PTFE)-coated glass fiber fabrics are used for long-lasting membrane structures due to their outstanding mechanical properties, chemical stabilities, and satisfying service life. During their operation time, different environmental impacts might influence their performance, especially regarding the mechanical properties. In this contribution, the impact of water on the tensile strength deterioration was assessed experimentally, providing evidence of considerable but partially reversible loss of strength by up to 20% among the various types of investigated industrially established fabrics.

scholarly journals A Scheme for Controlled Cyclic Asymmetric Remote State Preparation in Noisy Environment

2021 ◽  
Vol 11 (4) ◽  
pp. 1405
Author(s):  
Nan Zhao ◽  
Tingting Wu ◽  
Yan Yu ◽  
Changxing Pei
Keyword(s):  
Quantum Information ◽  
Information Transmission ◽  
Remote State Preparation ◽  
Quantum Computers ◽  
Noisy Environment ◽  
State Preparation ◽  
Channel Expression ◽  
Actual Environment ◽  
The Impact ◽  
Multi Mode

As research on quantum computers and quantum information transmission deepens, the multi-particle and multi-mode quantum information transmission has been attracting increasing attention. For scenarios where multi-parties transmit sequentially increasing qubits, we put forward a novel (N + 1)-party cyclic remote state preparation (RSP) protocol among an arbitrary number of players and a controller. Specifically, we employ a four-party scheme in the case of a cyclic asymmetric remote state preparation scheme and demonstrate the feasibility of the scheme on the IBM Quantum Experience platform. Furthermore, we present a general quantum channel expression under different circulation directions based on the n-party. In addition, considering the impact of the actual environment in the scheme, we discuss the feasibility of the scheme affected by different noises.

The Impact of Classroom Chatter Noise on Comprehension: A Systematic Review

2021 ◽  
pp. 003151252110059
Author(s):  
Anne-Sophie Lamotte ◽  
Aziz Essadek ◽  
Gérard Shadili ◽  
Jean-Michel Perez ◽  
Julien Raft
Keyword(s):  
Systematic Review ◽  
Literature Review ◽  
Teaching Methods ◽  
Classroom Environment ◽  
Field Survey ◽  
Human Life ◽  
Experimental Studies ◽  
Noisy Environment ◽  
Student Comprehension ◽  
The Impact

Communication through discussion and conversations is fundamental to human life; but when such discourse escapes the control of a teacher in the classroom, it becomes little more than chatter. This noise challenges teaching methods and the teaching stance with students. Yet, its impact on comprehension has rarely been studied. The aim of this literature review was to examine the research on the impact of classroom noise generated by chatter on students’ comprehension performance. We adopted the PRISMA (Preferred Reporting Items for Systematic Reviews and Metanalysis) guidelines to examine this literature. This review covered a 10-year period (papers written between 2009 and 2019), with nine experimental studies selected from the 2,954 papers screened. In 89% of these nine studies, there were significant comprehension differences on all tests, revealed when comprehension took place in a noisy environment due to chatter. This review indicated an essential need for a field survey to better understand the impact of chatter on comprehension. Other studies are recommended to highlight any correlation between measured chatter and student comprehension in a real classroom environment.

scholarly journals Speeding Up the Write Operation for Multi-Level Cell Phase Change Memory with Programmable Ramp-Down Current Pulses

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 461 ◽  
Author(s):  
Chenchen Xie ◽  
Xi Li ◽  
Houpeng Chen ◽  
Yang Li ◽  
Yuanguang Liu ◽  
...  
Keyword(s):  
Phase Change ◽  
Current Source ◽  
Phase Change Memory ◽  
Operation Time ◽  
Access Time ◽  
Fully Differential ◽  
Current Pulses ◽  
Multi Level ◽  
The Impact ◽  
Change Memory

Multi-level cell (MLC) phase change memory (PCM) can not only effectively multiply the memory capacity while maintaining the cell area, but also has infinite potential in the application of the artificial neural network. The write and verify scheme is usually adopted to reduce the impact of device-to-device variability at the expense of a greater operation time and more power consumption. This paper proposes a novel write operation for multi-level cell phase change memory: Programmable ramp-down current pulses are utilized to program the RESET initialized memory cells to the expected resistance levels. In addition, a fully differential read circuit with an optional reference current source is employed to complete the readout operation. Eventually, a 2-bit/cell phase change memory chip is presented with a more efficient write operation of a single current pulse and a read access time of 65 ns. Some experiments are implemented to demonstrate the resistance distribution and the drift.

scholarly journals Evaluating the effect of compressing algorithms for trajectory similarity and classification problems

2021 ◽  
Author(s):  
Antonios Makris ◽  
Camila Leite da Silva ◽  
Vania Bogorny ◽  
Luis Otavio Alvares ◽  
Jose Antonio Macedo ◽  
...  
Keyword(s):  
Trajectory Analysis ◽  
Similarity Measures ◽  
Classification Problems ◽  
Trajectory Data ◽  
Compression Algorithms ◽  
Time Ratio ◽  
Ratio Speed ◽  
Trajectory Similarity ◽  
Real World Datasets ◽  
The Impact

AbstractDuring the last few years the volumes of the data that synthesize trajectories have expanded to unparalleled quantities. This growth is challenging traditional trajectory analysis approaches and solutions are sought in other domains. In this work, we focus on data compression techniques with the intention to minimize the size of trajectory data, while, at the same time, minimizing the impact on the trajectory analysis methods. To this extent, we evaluate five lossy compression algorithms: Douglas-Peucker (DP), Time Ratio (TR), Speed Based (SP), Time Ratio Speed Based (TR_SP) and Speed Based Time Ratio (SP_TR). The comparison is performed using four distinct real world datasets against six different dynamically assigned thresholds. The effectiveness of the compression is evaluated using classification techniques and similarity measures. The results showed that there is a trade-off between the compression rate and the achieved quality. The is no “best algorithm” for every case and the choice of the proper compression algorithm is an application-dependent process.

The Impact of Gender on Use of Cybercafé: A Survey of Cybercafé Users

2018 ◽  
Vol 8 (1) ◽  
pp. 80-86
Author(s):  
S. U. Shiva Kumara ◽  
B. T. Sampath Kumar
Keyword(s):  
Internet Services ◽  
Noisy Environment ◽  
Male And Female ◽  
Internet Connection ◽  
History Of ◽  
The Impact

The study aims to know the Impact of gender on the use of cybercafé. The study focused on the frequency and purpose of using cybercafé by male and female users. It also focused on the problems encountered by male and female users while using Internet at cybercafé. An aggregate of 450 copies of questionnaires were circulated to the cybercafé user, of which 416 properly filled questionnaires were returned. Data was analyzed using SPSS 21.0 version. It was observed that male users had a long history of using cybercafé than female counterparts (p<.000). The data also indicate that there is an association between the frequency of visit to the cybercafé and the gender (p<.000). High cost of Internet services (74.2%), noisy environment in and around the cybercafé (55.76%) and slow Internet connection (49.75%) at cybercafé were major problems faced by the cybercafé users.

scholarly journals Postoperative Hypoalbuminemia: Prevalence, Risk Factors, Association with Postoperative Pneumonia in Brain Tumors Patients Undergoing Craniotomy

2021 ◽  
Author(s):  
Da-wei Zhao ◽  
Xu-yang Zhang ◽  
Kai-yan Wei ◽  
Yi-bin Jiang ◽  
Dan Liu ◽  
...  
Keyword(s):  
Risk Factors ◽  
Brain Tumor ◽  
Brain Tumors ◽  
Operation Time ◽  
Postoperative Pneumonia ◽  
Tumor Surgery ◽  
Regression Analyses ◽  
Brain Tumor Surgery ◽  
The Impact ◽  
Preoperative Albumin

Abstract Hypoalbuminemia is associatied with poor outcome in patients undergoing surgery intervention. The main aim for this study was to investigate the incidence and the risk factors of postoperative hypoalbuminemia and assessed the impact of postoperative hypoalbuminemia on complications in patients undergoing brain tumor surgery. This retrospective study included 372 consecutive patients who underwent brain tumors surgery from January 2017 to December 2019. The patients were divided into hypoalbuminemia (< 35 g/L) and non-hypoalbuminemia group (≥ 35 g/L) based on postoperative albumin levels. Logistic regression analyses were used to determine risk factors. Of the total 372 patients, 333 (89.5%) developed hypoalbuminemia after surgery. Hypoalbuminemia was associated with operation time (OR 1.011, P < 0.001), preoperative albumin (OR 0.864, P = 0.015) and peroperative globulin (OR 1.192, P = 0.004). Postoperative pneumonia had a higher incidence in patients with than without hypoalbuminemia (41.1% vs 23.1%, P = 0.029). The independent predictors of postoperative pneumonia were age (OR 1.053, P < 0.001), operation time (OR 1.003, P = 0.013) and lower postoperative albumin (OR 0.946, P = 0.018). Postoperative hypoalbuminemia has a higher incidence with the increase of operation time, and is associated with postoperative pneumonia in patients undergoing brain tumor surgery.

A Clinical Observational Study on the Application of Enhanced Recovery After Laparoscopic Pancreaticoduodenectomy

2021 ◽  
Author(s):  
Rui Liao ◽  
Ping Che ◽  
Jun-Cai Li ◽  
Jie Chen ◽  
Xiong Yan
Keyword(s):  
Enhanced Recovery ◽  
Operation Time ◽  
Perioperative Period ◽  
Medical Costs ◽  
Time Frame ◽  
Laparoscopic Pancreaticoduodenectomy ◽  
Readmission Rates ◽  
Retrospective Clinical Study ◽  
Previously Treated ◽  
The Impact

Abstract Background: The safety and feasibility of enhanced recovery after surgery (ERAS) for laparoscopic pancreaticoduodenectomy (LPD) are unclear. The aim of this retrospective clinical study was to evaluate the impact of ERAS protocols for LPD.Methods: Between March 2016 and December 2018, a total of 34 consecutive patients with ERAS for LPD were prospectively enrolled and compared with 68 consecutive patients previously treated for non-ERAS after LPD during an equal time frame. The intraoperative and postoperative data were collected and comparatively analyzed. Results: The mean length of postoperative hospital stay (15.8±3.4 and 23.1±5.1 days, P<0.001) and total medical costs (¥14.3±4.8 x104 and ¥15.8±4.9 x104, P=0.017) were reduced significantly in ER group than those in non-ER group. The operation time (462.7±117.0 vs 450.9±109.8 min, P=0.627) and intraoperative blood loss (523.5±270.0 vs 537.5±241.8 mL, P=0.800) were similar in the two groups. The complications of patients with ERAS protocols were not increased (P>0.05). No difference in mortality and readmission rates was found.Conclusions: The ERAS is safe and effective in the perioperative period of LPD. It could effectively reduce the length of postoperative stay and medical costs, and does not increase the incidence of postoperative complications.

Realizing an N-two-qubit quantum logic gate in a cavity QED with nearest qubit--qubit interaction

2016 ◽  
Vol 16 (5&6) ◽  
pp. 465-482
Author(s):  
Taoufik Said ◽  
Abdelhaq Chouikh ◽  
Karima Essammouni ◽  
Mohamed Bennai
Keyword(s):  
Quantum Logic ◽  
Cavity Qed ◽  
Logic Gate ◽  
Operation Time ◽  
Logic Gates ◽  
Initial State ◽  
Gate Operation ◽  
Quantum Logic Gates ◽  
Current State ◽  
Phase Gate

We propose an effective way for realizing a three quantum logic gates (NTCP gate, NTCP-NOT gate and NTQ-NOT gate) of one qubit simultaneously controlling N target qubits based on the qubit-qubit interaction. We use the superconducting qubits in a cavity QED driven by a strong microwave field. In our scheme, the operation time of these gates is independent of the number N of qubits involved in the gate operation. These gates are insensitive to the initial state of the cavity QED and can be used to produce an analogous CNOT gate simultaneously acting on N qubits. The quantum phase gate can be realized in a time (nanosecond-scale) much smaller than decoherence time and dephasing time (microsecond-scale) in cavity QED. Numerical simulation under the influence of the gate operations shows that the scheme could be achieved efficiently within current state-of-the-art technology.

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