نتایج جستجو برای: photon polarisation
تعداد نتایج: 74348 فیلتر نتایج به سال:
We derive a simple expression for the photon helicity and polarisation-flip probabilities in arbitrary background fields, in the low energy regime. Taking the background to model a focused laser beam, we study the impact of pulse shape and collision geometry on the probabilities and on ellipticity signals of vacuum birefringence. We find that models which do not account for pulse duration can o...
We extend quantum process calculus in order to describe linear optical elements. In all previous work on quantum process calculus a qubit was considered as the information encoded within a 2 dimensional Hilbert space describing the internal states of a localised particle, most often realised as polarisation information of a single photon. We extend quantum process calculus by allowing multiple ...
Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: AUL wit...
We present and discuss perspectives on developing advanced quantum optical circuits monolithically integrated in the lithium niobate platform. A set of basic components comprising photon pair sources based on parametric down conversion (PDC), passive routing elements and active electrooptically controllable switches and polarisation converters are constituent parts of a toolbox which is the bas...
We have measured the spin polarisation of electrons scattered superelastically from laser-excited Na atoms at a collision energy of 20 eV and a scattering angle of 30’. The measured spin polarisation is 0.095 zt0.048 for scattering from the 3p zPl/z excited state of Na. The polarisation changes sign if the laser is tuned to the 3p 2P3,z state, as is expected on formal grounds. We also present c...
در این پایان نامه ما نگاشت های سایبرگ –ویتن را برای میدان هیگز و میدان پیمانه ای غیر آبلی تا مرتبه ی دوم ? (پارامتر ناجابجایی) بدست آورده ایم. در ادامه، جرم دار کردن نوترینو و خواص الکترومغناطیسی و رابطه ی پاشندگی آن را در دو نسخه ی متفاوت از مدل استاندار در فضای ناجابجایی، مطالعه کردن و نشان داده ایم در مدل استاندارد در فضای ناجابجایی که با استفاده از نگاشت های سایبرگ-ویتن بر اساس گروه تقارن پ...
The high bb cross section produced by the LHC offers an excellent opportunity for the study of flavour changing neutral current B decays, where the effects of new physics can be probed. This thesis presents an analysis of the rare decay B→ K∗0e+e−, which can be used to measure the polarisation of the photon in the b→ sγ transition. When the dilepton mass is low, the e+e− pair comes predominantl...
We solve the wave equation for the electromagnetic field tensors associated with the CMBR photons in a universe with scalar metric perturbations. We show that the coupling of the electromagnetic fields with the curvature associated with the scalar perturbations gives rise to an optical rotation of the microwave background photons. The magnitude of the gravitationally generated V-Stokes paramete...
We draw attention to an elementary flaw in a recently proposed experiment to measure the wave function of a single quantum system. In a recent paper, Aharonov, Anandan and Vaidman [1] claim to have devised an experiment to measure the wave function [2] of a single quantum mechanical system. The experiment they propose is a 'protective measure-ment': while the measurement is being performed, the...
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