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We study two-dimensional sections of a set of Bloch vectors corresponding to density matrices of two-qubit system.
The relationship between the noncommutativity of operators and the violation of the Bell inequality is exhibited in the light of the n -particle Bell-type inequality discovered by Mermin (Phys. Rev. Lett. 65 (1990) 1838). It is shown, in particular, that the maximal amount of violation of...
A “continuous measurement” quantum Zeno effect (QZE) in the context of trapped ions is predicted. We describe the physical system and study its exact time evolution showing the appearance of Zeno phenomena. New indicators for the occurrence of QZE in oscillatory systems are proposed and...
The three-dimensional structure of the wake potential due to ion cyclotron wave in a dusty magnetized plasma with streaming ions is studied. The analysis includes the E × B drift effect in addition to the ions flow with a constant velocity u io perpendicular to the magnetic field. The result...
It is argued that all Pegg–Barnett phase states possess maximum nonclassical depth, a result which contradicts some of the statements made by Marchiolli et al. (Phys. Lett. A 279 (2001) 294).
We calculate resonances, antibound states and two new light induced states of the dressed one-dimensional attractive δ -function potential, as function of α 0 — the free electron quiver motion amplitude in a monochromatic electromagnetic field, in the range 0< α 0 <150 a.u. We describe also...
Quantum non-demolition (QND) variables are generalized to the nonlocal ones by proposing QND measurement networks of Bell states and multi-partite GHZ states, which means that we can generate and measure them without any destruction. One of its prospective applications in the quantum...
The nonlinear Klein–Gordon equation modeling a metastable medium with a small vacuum energy difference ΔU is considered. An equation describing the expansion of a bubble of a large radius R is obtained in the second approximation in ΔU and 1/ R .
We show the applicability to the isotropic D -dimensional potential V ( r )= a ( r 2 − b 2 ) 2 of a procedure leading to exact quantization conditions. The energies of the bound states for a >0 and resonances for a <0 are easily obtained.
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