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Probabilities of measurement outcomes of two-particle entangled states give a physically transparent interpretation of the concurrence and of the I-concurrence as entanglement measures. The (I-)concurrence can thus be measured experimentally. The tight connection between these measures and Bell...
We introduce a new state of light field, called nonlinear displaced number states which is obtained through the displaced number states, by introducing the nonlinearity. The statistical properties is investigated shown that it presents several interesting quantum effects.
The results of experimental investigation of the mechanical noise produced by fused silica fibers at room temperature is reported. The best achieved resolution is about 0.01 k T for the modes with quality factor from 10 5 to 10 7 . Over the 90 hours of observation no excess (additional to...
Relativistic oscillator strengths for dipole transitions in one valence electron alkali-like atomic systems are determined with Dirac and quasirelativistic quantum-defect radial wave functions. The calculations carried out account explicitly for core polarisation effects. This leads to a change...
The adiabatic theorem shows that the instantaneous eigenstate is a good approximation of the exact solution for a quantum system in adiabatic evolution. One may therefore expect that the geometric phase calculated by using the eigenstate should be also a good approximation of exact geometric...
In allowed photonic bands of one-dimensional photonic crystals (Bragg mirrors) light modes propagate with negative effective masses at certain frequencies. We demonstrate theoretically that this effect allows for the negative refraction of the visible light. We propose a structure made of two...
We show that a simple modification of proposed ribbon suspensions for laser interferometric gravitational wave detectors can substantially reduce the amplitude of violin modes at the expense of a small deterioration of suspension thermal noise. Using low loss fused silica, large amplitude peaks...
Time evolution equation for the probability distribution function (PDF) is derived for system of weakly interacting waves, dominated by the four-wave process. It is shown that a steady state for such system may correspond to strong intermittency. Numerical simulation performed on the surface...
Temperature dependence of the effective tunneling frequency of the spin–phonon model for a few particular types of coupling has been studied within the framework of the simple variational method. Our analysis shows that for the Ohmic type of coupling, temperature drives the system towards...
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