scholarly journals Bidirectional Quantum Communication through the Composite GHZ-GHZ Channel

2020 ◽  
Vol 10 (16) ◽  
pp. 5500
Author(s):  
Shuangshuang Shuai ◽  
Na Chen ◽  
Bin Yan
Keyword(s):  
Quantum Communication ◽  
Information Leakage ◽  
Quantum Measurements ◽  
Transmission Scheme ◽  
Quantum Bits ◽  
Ghz States ◽  
Surrounding Environment ◽  
Measurement Results ◽  
Different Types ◽  
Communication Scheme

This paper solved the problem of transmitting quantum bits (qubits) in a multi-hop and bidirectional way. Considering that the Greenberger–Horne–Zeilinger (GHZ) states are less prone to the decoherence effects caused by the surrounding environment, we proposed a bidirectional quantum communication scheme based on quantum teleportation and the composite GHZ-GHZ states. On a multi-hop quantum path, different types of GHZ states are previously shared between the adjacent intermediate nodes. To implement qubit transmission, the sender and intermediate nodes perform quantum measurements in parallel, and then send their measurement results and the types of previously shared GHZ states to the receiver independently. Based on the received information, the receiver performs unitary operations on the local particle, thus retrieving the original qubit. Our scheme can avoid information leakage at the intermediate nodes and can reduce the end-to-end communication delay, in contrast to the hop-by-hop qubit transmission scheme.

MULTIPARTY CONTROLLED DETERMINISTIC SECURE QUANTUM COMMUNICATION THROUGH ENTANGLEMENT SWAPPING

2008 ◽  
Vol 19 (11) ◽  
pp. 1673-1681 ◽  
Author(s):  
LI DONG ◽  
XIAO-MING XIU ◽  
YA-JUN GAO ◽  
FENG CHI
Keyword(s):  
Quantum Channel ◽  
Secure Communication ◽  
Quantum Communication ◽  
Entanglement Swapping ◽  
Deterministic Secure Quantum Communication ◽  
Classical Information ◽  
Secret Information ◽  
Ghz States ◽  
Quantum Secure Communication ◽  
Communication Scheme

A three-party controlled deterministic secure quantum communication scheme through entanglement swapping is proposed firstly. In the scheme, the sender needs to prepare a class of Greenberger–Horne–Zeilinger (GHZ) states which are used as quantum channel. The two communicators may securely communicate under the control of the controller if the quantum channel is safe. The roles of the sender, the receiver, and the controller can be exchanged owing to the symmetry of the quantum channel. Different from other controlled quantum secure communication schemes, the scheme needs lesser additional classical information for transferring secret information. Finally, it is generalized to a multiparty controlled deterministic secure quantum communication scheme.

scholarly journals Research of the Photo-Optical Method Application for Measuring Selected Data on the Movement of a Parachute for Type M-282

2021 ◽  
Vol 11 (12) ◽  
pp. 5637
Author(s):  
Peter Kaľavský ◽  
Róbert Rozenberg ◽  
Peter Korba ◽  
Martin Kelemen ◽  
Matej Antoško ◽  
...  
Keyword(s):  
Optical Method ◽  
Training Programs ◽  
Performance Standard ◽  
Motion Data ◽  
Innovative Methods ◽  
Measurement Results ◽  
Different Types ◽  
Vertical Speed ◽  
Individualized Training ◽  
Minimum Performance

Testing in the field of parachute technology provides space for the application of new and innovative methods of measuring operating and functional parameters. The main aim of the paper is to present the results of research for the verification of the photo-optical method of measuring the vertical speed of the M-282 parachutes, and for its use in testing, collecting, and investigating motion data in parachuting. As part of this measuring technology, twelve jumps were performed. It was verified that the experiment was completed for the M-282 parachute according to the regulation of SAE AS 8015B “Minimum Performance Standard Parachute Assemblies and Components”. An analysis of the influencing factors and quantification of their influence on the uncertainty of the measurement results was also performed. The results of the measurement achieved by using the photo-optical method were compared with the measurement with the electronic variometer FLYTEC 4030. The vertical speed of the M-282 parachute (4.655 m·s−1) defined by the photo-optical method is significantly similar to the vertical speed of the M-282 parachute (4.662 m·s−1) defined by FLYTEC 4030. We can state that the process of identifying the vertical speed of the parachute by the photo-optical method was correct. This is a suitable method of evaluating motion data in the operation of M-282 type parachutes. In the following research for generalization of the methodology, we assume the performance of more than 60 experimental jumps using different types of parachutes, digital sensors (cameras), and a photo-optical method to examine motion data and formulate recommendations for testing, investigative applications, individualized training programs, and aspects of parachuting injury prevention.

scholarly journals Application of Extraction and Determination Based on Deep Eutectic Solvents in Different Types of Environmental Samples

Water ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 46
Author(s):  
Yonghua Wang ◽  
Na Li ◽  
Shengnan Jiang ◽  
Xi Chen
Keyword(s):  
Extraction Efficiency ◽  
Deep Eutectic Solvents ◽  
Extraction Methods ◽  
Water Sources ◽  
Environmental Research ◽  
Environmental Matrices ◽  
Controllable Synthesis ◽  
Surrounding Environment ◽  
Target Analytes ◽  
Different Types

Water sources are an indispensable resource for human survival. Monitoring the pollution status of the surrounding environment is necessary to protect water sources. Research on the environmental matrix of deep eutectic solvents (DESs) has expanded rapidly because of their high extraction efficiency for various target analytes, controllable synthesis, and versatile structure. Following the synthesis of hydrophobic deep eutectic solvents (HDESs), their application in aqueous matrices broadened greatly. The present review conducted a survey on the pollutant extraction methods based DESs in environmental matrices from two aspects, application methods and matrix types; discussed the potential risk of DESs to the environment and future development trends; and provided some references for researchers to choose DES-based extraction methods for environmental research.

scholarly journals Multifaceted role of tensins in cancer

2019 ◽  
Author(s):  
Abdulaziz Alfahed ◽  
Teresa P Raposo ◽  
Mohammad Ilyas
Keyword(s):  
Cancer Biology ◽  
Focal Adhesions ◽  
Adaptor Proteins ◽  
Therapeutic Strategies ◽  
Cell Behavior ◽  
Surrounding Environment ◽  
Signaling Mechanisms ◽  
Different Types ◽  
Biochemical Signals

Tensins are structural adaptor proteins localized at focal adhesions. Tensins can act as mechanosensors and participate in the transduction of biochemical signals from the extracellular matrix to the cytoskeleton, acting as an interface able to alter cell behavior in responses to changes in their surrounding environment. This review aims to provide a concise summary of the main functions of the four known tensins in cell and cancer biology, their homology and recently unveiled signaling mechanisms. We focus specifically on how tensin 4 (TNS4/Cten) may contribute to cancer both as an oncogene supporting metastasis and as tumour suppressor in different types of tissue. A better understanding of the cancer mechanistics involving tensins may provide the rationale for development of specific therapeutic strategies.

Quantum communication scheme with freely selectable users

2021 ◽  
pp. 2150156
Author(s):  
Tianqi Dou ◽  
Hongwei Liu ◽  
Jipeng Wang ◽  
Zhenhua Li ◽  
Wenxiu Qu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Quantum Communication ◽  
Information Science ◽  
Quantum Secret Sharing ◽  
Key Distribution ◽  
Communication Process ◽  
Secret Key ◽  
Quantum Information Science ◽  
Transmission Distance ◽  
Communication Scheme

Quantum communication plays an important role in quantum information science due to its unconditional security. In practical implementations, the users of each communication vary with the transmitted information, and hence not all users are required to participate in each communication round. Therefore, improving the flexibility and efficiency of the actual communication process is highly demanded. Here, we propose a theoretical quantum communication scheme that realizes secret key distribution for both the two-party quantum key distribution (QKD) and multi-party quantum secret sharing (QSS) modes. The sender, Alice, can freely select one or more users to share keys among all users, and nonactive users will not participate in the process of secret key sharing. Numerical simulations show the superiority of the proposed scheme in transmission distance and secure key rate. Consequently, the proposed scheme is valuable for secure quantum communication network scenarios.

scholarly journals Random Telegraph Noises from the Source Follower, the Photodiode Dark Current, and the Gate-Induced Sense Node Leakage in CMOS Image Sensors

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5447
Author(s):  
Calvin Yi-Ping Chao ◽  
Shang-Fu Yeh ◽  
Meng-Hsu Wu ◽  
Kuo-Yu Chou ◽  
Honyih Tu ◽  
...  
Keyword(s):  
Dark Current ◽  
Image Sensors ◽  
Integration Time ◽  
X Ray ◽  
Multiple Sampling ◽  
Cmos Image Sensors ◽  
Measurement Results ◽  
Source Follower ◽  
Different Types ◽  
Dark Signal

In this paper we present a systematic approach to sort out different types of random telegraph noises (RTN) in CMOS image sensors (CIS) by examining their dependencies on the transfer gate off-voltage, the reset gate off-voltage, the photodiode integration time, and the sense node charge retention time. Besides the well-known source follower RTN, we have identified the RTN caused by varying photodiode dark current, transfer-gate and reset-gate induced sense node leakage. These four types of RTN and the dark signal shot noises dominate the noise distribution tails of CIS and non-CIS chips under test, either with or without X-ray irradiation. The effect of correlated multiple sampling (CMS) on noise reduction is studied and a theoretical model is developed to account for the measurement results.

A New Quantum Communication Scheme by Using Bell States

2006 ◽  
Vol 45 (2) ◽  
pp. 271-274 ◽  
Author(s):  
Cao Hai-Jing ◽  
Chen Jing ◽  
Song He-Shan
Keyword(s):  
Quantum Communication ◽  
Bell States ◽  
Communication Scheme

Generation of four-photon polarization entangled states with cross-Kerr nonlinearity

2015 ◽  
Vol 13 (05) ◽  
pp. 1550024 ◽  
Author(s):  
Meiyu Wang ◽  
Fengli Yan
Keyword(s):  
Kerr Nonlinearity ◽  
Entangled States ◽  
Entangled State ◽  
Kerr Medium ◽  
Coherent Light ◽  
Photon Polarization ◽  
Beam Splitters ◽  
Ghz States ◽  
Different Types ◽  
Quantum Optical

We show how to prepare three different types of four-photon polarization entangled states among four modes. The scheme only use cross-Kerr medium, polarization beam splitters and X homodyne measurements on coherent light fields, which can be efficiently implemented in quantum optical laboratories. GHZ states and symmetric Dick states can be generated in deterministic way based on the scheme. With the possible availability of suitable strong Kerr nonlinearity, another type of entangled state called genuine four-photon entangled state can be realized as well.

scholarly journals Reactivity in measuring depression

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Rosa W. Runhardt
Keyword(s):  
Social Construction ◽  
Human Subject ◽  
Research Subject ◽  
Harmful Dysfunction ◽  
Measurement Results ◽  
Reactive Changes ◽  
Different Types ◽  
Biological Aspects

AbstractIf a human subject knows they are being measured, this knowledge may affect their attitudes and behaviour to such an extent that it affects the measurement results as well. This broad range of effects is shared under the term ‘reactivity’. Although reactivity is often seen by methodologists as a problem to overcome, in this paper I argue that some quite extreme reactive changes may be legitimate, as long as we are measuring phenomena that are not simple biological regularities. Legitimate reactivity is reactivity which does not undermine the accuracy of a measure; I show that if such reactivity were corrected for, this would unjustifiably ignore the authority of the research subject. Applying this argument to the measurement of depression, I show that under the most commonly accepted models of depression there is room for legitimate reactivity. In the first part of the paper, I provide an inventory of the different types of reactivity that exist in the literature, as well as the different types of phenomena that one could measure. In the second part, I apply my argument to the measurement of depression with the PHQ-9 survey. I argue that depending on what kind of phenomenon we consider depression to be (a disease, a social construction, a harmful dysfunction, or a practical kind), we will accept different kinds of reactivity. I show that both under the harmful dysfunction model and the practical kinds model, certain reactive changes in measuring depression are best seen as legitimate recharacterizations of the underlying phenomenon, and define what legitimate means in this context. I conclude that in both models, biological aspects constrain characterization, but the models are not so strict that only one concept is acceptable, leaving room for reactivity.

Sign in / Sign up

Export Citation Format

Share Document