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Measurement - Astrophysics Data System

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Last Updated: 22 September 2022

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Frequency-domain probe beam deflection method for measurement of thermal conductivity of materials on micron length scale

The beam deflection is primarily caused by thermoelastic deformation of the sample surface, which can be determined by the bulk material's measurement's thermal expansion coefficient. We derive an analytical response to the coupled elasticity and heat diffusion equations for periodic heating of a multilayer sample with anisotropic elastic constants, thermal conductivity, and thermal expansion coefficients. In most cases, a simplified model can effectively define the frequency dependence of the beam deflection signal without knowing of the elastic constants and thermal expansion coefficients of the material. If the thermal expansion coefficient is greater than 5x10/K, the magnitude of the probe beam deflection signal is larger than the maximum magnitude achievable by thermoreflectance measurement of surface temperatures. When a larger beam offset is used, the sensitivity to laser beam radii is reduced.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908239S/abstract


Forward Modeling of Magnetic-field Measurements at the Bases of Stellar Coronae through Extreme-Ultraviolet Spectroscopy

Measurements have been extremely difficult, with measurements proving the stellar magnetic field of great importance in understanding the stellar magnetic flux. Recent research has suggested a new method of magnetic field measurements based on the Fe scx ion's magnetic-field-induced transition. In addition, we investigate the source of the stellar coronal magnetic field's accuracy by photon counting error and find that a signal-noise ratio of 2̆23c 50 for the Fescx 175 u00c5 line is required to obtain precise measurements of the stellar coronal magnetic field.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908755L/abstract


Measurement of Stimulated Raman Side-Scattering Predominance and Energetic Importance in the Compression Stage of the Double-Cone Ignition Approach to Inertial Confinement Fusion

The scattered light generated by SRSS has been measured over a wide variety of angles, including a large polar angle, sensitive to the plasma profile and laser polarization. Moreover, direct comparison with back-scattering measurements has shown SRSS as the most common Raman scattering process in the compression stage, resulting in the scattering loss of around 5 percent of the total laser energy.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908251G/abstract


2x2 MIMO Prototype for BER and EVM Measurements in Metal Enclosure

In three different scenarios in a heavily reflecting metal enclosure environment, we investigate the near-field MIMO BER and EVM measurements. When the mode-stirrrer is set to move continuously, the second scenario is similar, with BER and EVM measurements being carried out in dynamic channel conditions. In the third scenario, LOS and EVM measurements are carried out in stable channel conditions but not so in the presence of MIMO interference. At three distinct scenarios, near-field MIMO BER and EVM measurements are investigated at different Tx USRP gain rates and in the presence of various degrees of MIMO interference, in three different scenarios, near-field MIMO BER and EVM measurements are investigated.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908392L/abstract


Measurement of single top-quark production in the s-channel in proton$-$proton collisions at $\mathrm{\sqrt{s}=13}$ TeV with the ATLAS detector

With the ATLAS detector at the CERN Large Hadron Collider, a measurement of single top-quark production in the s-channel is carried out in proton - proton collisions with a center-of-mass energy of 13 TeV.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908990A/abstract


Quantum Non-Demolition Measurement on the Spin Precession of Laser-Trapped $^{171}$Yb Atoms

atoms held in an optical dipole trap are converted into spin-state selectable, spin-state selective, and spin-state preserving by introducing a circularly polarized beam of control laser to optically dress the spin states in the excited degree, while leaving the spin states intact. In a bias magnetic field of 20 mG, we measure the phase of spin precession of ^171 atoms. This QND approach reduces the optical absorption detection noise by 50̆0d710^4 19 dB to a level of 2. 3 dB below the atomic quantum measurement noise.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908218Y/abstract


Efficient Information Retrieval for Sensing via Continuous Measurement

The continuous monitoring of driven dissipative quantum optical systems provides novel techniques for quantum metrology implementation. The acceptor of the emitted radiation quanta in this context is the quantum Fisher data of the system's environment, according to the system's environment. We design a new continuous measurement system that incorporates matrix product states in response to the unavoidable quest for the environmental quantum Fisher data. Such measurements can be implemented economically by converting the emission field of the system into an auxiliary open system, a quantum decoder' module, which converts' specific input matrix product states into simple product states as its output field, and simple continuous measurement at the output. We develop an effective way for determining the quantum Fisher properties of generic open quantum optical systems as a by-product.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908777Y/abstract


Sequential unsharp measurement of photon polarization

For realizing sequential unsharp measurements of photon polarization, we propose a general experimental scheme based on binary trees of partially polarizing beam splitters. In cases in which the particular unsharp measurements are characterized by precise measurement operators, we propose a general framework for describing sequential unsharp measurements of photon polarization in which sequential unsharp measurements are described by appropriate measurement operators. The output polarization states after the sequential measurement and any correlation functions describing the measurement results can be calculated in this manner. We derived the questionable mean value for unsharp polarization test with postselection and the exceptionous second-order correlation function for the sequential unsharp measurement of photon polarization with reselection.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220909044A/abstract


Purification and scrambling in a chaotic Hamiltonian dynamics with measurements

Projective results in the simulation show that the law of the increase dynamics of the purity improves as a result of model assumptions. Using the state-channel map, we created the model for the tripartite mutual information for non-unitary time evolution operators in order to investigate this behavior in depth. In addition, the TMI's real-space dissemination of the TMI is investigated to determine spatial patterns of information dissemination. The spatial pattern of quantum information dissemination is not deformed in the purified period, but the rate of information dissemination is reduced on average by the projective results in quantum trajectories.

Source link: https://ui.adsabs.harvard.edu/abs/2022arXiv220908897K/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions