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- Alexander A Klyachko, M Ali Can, Sinem Binicioğlu, Alexander S Shumovsky
- Physical review letters
- 2008

We resolve an old problem about the existence of hidden parameters in a three-dimensional quantum system by constructing an appropriate Bell's type inequality. This reveals the nonclassical nature of most spin-1 states. We shortly discuss some physical implications and an underlying cause of this nonclassical behavior, as well as a perspective of its… (More)

Using the approach to quantum entanglement based on the quantum fluctuations of observables, we show the existence of perfect entangled states of a single “spin-1” particle. We give physical examples related to the photons, condensed matter physics, and particle physics. PACS numbers: 03.65.Ud, 42.50.Lc Submitted to: accelerated publication in Journal of… (More)

- M A Can, A A Klyachko, A S Shumovsky
- 2002

We discuss the generation and monitoring of durable atomic entangled state via Raman-type process, which can be used in the quantum information processing. PACS number(s): 03.65.Ud, 32.80.-t Typeset using REVTEX 1 The problem of creation of entangled states in atomic systems has attracted a great deal of interest (see and references therein). In particular,… (More)

2014 We consider the problem of resonance fluorescence from N two-level atoms interacting with an intense cavity mode. The novel results for the spectral and statistical properties of the fluorescence field, which are quite different from collective resonance fluorescence in a free space, are obtained. The correlation, anti-correlation between spectrum… (More)

A general form of the polarization matrix valid for any type of electromagnetic radiation (plane waves, multipole radiation etc.) is defined in terms of a certain bilinear form in the field-strength tensor. The quantum counterpart is determined as an operator matrix with normal-ordered elements with respect to the creation and annihilation operators. The… (More)

- M A Can, A A Klyachko, A S Shumovsky
- 2002

We discuss the generation and monitoring of durable atomic entangled state via Raman-type process, which can be used in the quantum information processing. PACS number(s): 03.65.Ud, 32.80.-t Typeset using REVTEX 1 The problem of creation of entangled states in atomic systems has attracted a great deal of interest (see and references therein). In particular,… (More)

2014 In the dipole and rotating wave approximation the operator solutions for the level populations and photon numbers are found. The numerical results for the time-evolution of the level populations for the case of initially coherent pumping modes 1 and 3 (mode 2 initially in vacuum) are reported and compared with those for a three-level atom in the ladder… (More)

A general fundamental relation connecting the correlation of Stokes and anti-Stokes modes to the quantum statistical behavior of vibration and pump modes in Raman-active materials is derived. We show that under certain conditions this relation can be used to determine the equilibrium number variance of phonons. Time and temperature ranges for which such… (More)

- A. S. Shumovsky, Fam Le Kien, E. I. Aliskenderov
- 2016

Characteristics of the collective spontaneous emission of a system consisting of two two-level multiphoton-transition atoms excited in a lossless resonant cavity are calculated. The photon-multiplicity collective behaviour is found to affect the photon dynamics and statistics considerably. J. Physique 48 (1987) 1933-1937 NOVEMBRE 1987, Classification… (More)

2014 The collective resonance fluorescence from a system of two-level atoms resonantly driven by a strong laser field with the phase and amplitude fluctuations is considered. The effect of the laser field fluctuations on the spectrum as well as the degrees of the second-order coherence of the fluorescent field is discussed in detail for the off-resonance… (More)