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About 10,000 papers for “Continuous variable”

Continuous variable information.

Bijoya Saha (19762337), Shah Md Atiqul Haq (11592514) · Figshare · 2025

<div> This study investigates the relationship between environmental concerns and future childbearing aspirations among university students in Bangladesh. It included 380 final-year and master’s students from various academic disciplines at Shahjalal University of Science and Technology (SUST), Bangladesh, who completed a structured questionnaire. The binary logistic regression model and Poisson regression model were employed to examine the effects of these variables (environmental concern, gender, religion, academic performance, university courses related to the environment or climate change, field of study, and perceived vulnerability to extreme weather events or climate change in their home region) on intentions to have children in the future. The findings demonstrate that environmental concerns significantly impact university students’ intentions to have children. Additionally, students who are concerned about environmental issues are more likely to desire children in the future and plan to limit their family size due to these concerns. Students’ future parenting plans are strongly influenced by their perceptions of environmental challenges. According to this study, female students are less likely to intend to have children if environmental conditions worsen. The findings suggest that several factors, including gender, disciplinary background, and environmental degradation, may influence future fertility intentions and, consequently, affect population dynamics. Such factors may also play a crucial role in shaping future population policies aimed at addressing the effects of climate change and achieving environmental sustainability. </div>

Cited by 0Open access

Continuous Variable Systems

Claude Fabre, Rodrigo G. Cortiñas · Cambridge University Press eBooks · 2023

Theoretical chapter devoted to the detailed description of continuous variable (CV) systems by consideringthe "phase space," that is spanned by position and momentum for massive particles, quadratures for a quantum electromagnetic field, and phase and charge for electrical circuits. It introduces tools like the Glauber, Husimi, or Dirac phase–space functions, and in more details the Wigner function, that are convenient to describe CV quantum states and their time evolution using the Moyal equation. The chapter gives examples of Wigner functions and their time evolution in the presence of dissipation. It then defines symplectic quantum maps that are simple and important cases of Hamiltonian evolution and are simply related to the covariance matrix containingvariances and correlations. It details the characterization of the quantum processes using the Williamson reduction and Bloch–Messiah decomposition. It discusses Gaussian and non-Gaussian states and the specific measurement procedures for CV states, such as homodyne and double homodyne detection. It introduces the EPR entangled state and, finally, describes how to characterize entanglement and unconditionally teleport Gaussian quantum states.

Cited by 1

Continuous variable features.

Lingyan Li (152754), Haoyu An (21810494) · Figshare · 2025

<div> Tourism short videos have become a crucial means for disseminating information and promoting tourism destinations, with user engagement directly impacting their spread and the long-term development of tourism industries. Taking Xi’an as a case study, this paper constructs a framework for influencing factors of user engagement in tourism short videos from three dimensions: content, society, and technology, based on the theory of communication ecology. By blending multiple regression analysis with fuzzy-set qualitative comparative analysis (fsQCA), we explore the factors that influence user engagement in tourism short videos and further clarify the configurational causal relationships among these factors. This study found that: Content level (video type, scene quantity, scene representation, title sentence), social level (blogger type, blogger influence, blogger activity), and technological level (narrative way, background music, advertising information) significantly impact user engagement in tourism short videos. No single factor can solely constitute a necessary condition for promoting high user engagement. User engagement is actually the result of a combination of multiple factors. Notably, social level factors play a pervasive role in fostering active user engagement in tourism short videos. Further, fsQCA analysis identifies six conditional configurations that lead to high user engagement, categorizing them into three path types: content-driven, dual-dimensional co-driven, and comprehensive linkage. This study reveals the complex logic behind user engagement in tourism short videos, providing valuable insights for content marketing and promotional strategies of tourism short videos. </div>

Cited by 0Open access

Optical continuous-variable qubit

Neergaard-Nielsen, Jonas S., Takeuchi, Makoto, Wakui, Kentaro et al. · arXiv (Cornell University) · 2010

In a new branch of quantum computing, information is encoded into coherent states, the primary carriers of optical communication. To exploit it, quantum bits of these coherent states are needed, but it is notoriously hard to make superpositions of such continuous-variable states. We have realized the complete engineering and characterization of a qubit of two optical continuous-variable states. Using squeezed vacuum as a resource and a special photon subtraction technique, we could with high precision prepare an arbitrary superposition of squeezed vacuum and a squeezed single photon. This could lead the way to demonstrations of coherent state quantum computing.

Cited by 0Open access

Continuous-variable polarization entanglement

Natalia Korolkova, J. Heersink, Christine Silberhorn et al. · Queensland's institutional digital repository (The University of Queensland) · 2003

Quantum information with continuous variables conventionally exploits quantum variables with canonic: commutation relations, like position and momentum, or quadrature field components. In contrast, this contribution is devoted to quantum continuous polarization variables. The relevant observabIes are quantum Stokes operators which obey the SU(2) algebra with a commutator which is not a c-number but an operator. In this paper, we review the concept of polarization squeezing and the new concept of continuous-variable polarization entanglement using quantum Stokes parameters. We discuss the prospects and specific features of such nonclassical polarization states for quantum communication.

Cited by 1

Continuous variable quantum perceptron

F. Benatti, S. Mancini, S. Mangini · International Journal of Quantum Information · 2019

We present a model of Continuous Variable Quantum Perceptron (CVQP), also referred to as neuron in the following, whose architecture implements a classical perceptron. The necessary nonlinearity is obtained via measuring the output qubit and using the measurement outcome as input to an activation function. The latter is chosen to be the so-called Rectified linear unit (ReLu) activation function by virtue of its practical feasibility and the advantages it provides in learning tasks. The encoding of classical data into realistic finitely squeezed states and the use of superposed (entangled) input states for specific binary problems are discussed.

Cited by 8Open access

ELECTRONIC CONTINUOUS VARIABLE TRANSMISSION

BAUERS, EMILY LAUREN, BAUERS, EMILY LAUREN · UA Campus Repository (The University of Arizona) · 2021

The goal of the project is to design and build a prototype of an “Electronic Continuously Variable Transmission” (E-CVT) as a replacement for the current mechanical CVT on the Baja SAE race vehicle. The Baja race car’s mechanical CVT had two major issues that served as the primary reasons for undertaking this project. The first issue was the tedious and error-prone process of tuning the CVT. The second issue was the mechanical CVT not being properly sealed which put the components inside at a risk of damage from dirt and water. The E-CVT design consists of two pulleys connecting the engine and gearbox that change their diameter based on data collected from the engine. By using electric motors in conjunction with sensors and microcontrollers, the E-CVT algorithmically changes the gear ratio between the engine and gearbox. The E-CVT's insulated wiring and protective casing at IP54 certification level ensures its protection from water and dirt in the off-road racing environment. The new system offers greater adjustability and increased reliability.

Cited by 0

Continuous Variable Entanglement Swapping

Polkinghorne, R E S, Ralph, T C · CERN Bulletin · 1999

We investigate the efficacy with which entanglement can be teleported using a continuous measurement scheme. We show that by using the correct gain for the classical channel the degree of violation of locality that can be demonstrated (using a CH type inequality) is {\\it not} a function of the level of entanglement squeezing used in the teleportation. This is possible because a gain condition can always be chosen such that passage through the teleporter is equivalent to pure attenuation of the input field.

Cited by 0

Adapting continuous-variable teleportation

Mista, L, Filip, R · CERN Bulletin · 2004

A generalization of the standard continuous-variable teleportation protocol [S. L. Braunstein {\\it et al}., Phys. Rev. Lett. {\\bf 80}, 869 (1998)] is considered. The protocol exploits a fixed pure Gaussian entangled state as an entanglement resource and a generic bipartite quadratic interaction in the Bell measurement. Based on this protocol it is shown that a large class of such interactions can be used for realization of the Bell measurement. In addition, it is demonstrated that the noise added into the teleported state is minimum if auxiliary local symplectic transformations are performed on parts of the shared entangled state that convert effectively the protocol to the standard teleportation protocol. Practical utility of our scheme for enhancement of the teleportation fidelity in the teleportation protocol exploiting quantum nondemolition (QND) interaction is illustrated.

Cited by 0

Maturing continuous variable QKD.

Sarovar, Mohan; Bisson, Scott E.; Brif, Constantin; Farley, David Rushton; Grace, Matthew; Soh, Daniel Beom Soo; Young, Kevin · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 2019

Abstract not provided.

Cited by 0Open access