Browsing by Author "Shumovsky, Alexander S."
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Item Open Access Aharonov-Bohm effect induced by light(Springer, Dordrecht, 1998) Kulik, Igor O.; Shumovsky, Alexander S.; Hunter, G.; Jeffers, S.; Vigier, J. -P.The quantum interferometry of normal metallic loops based on the Aharonov-Bohm effect is usually applied to measurements at low temperatures in the case of static or slowly time-varying magnetic fields (e.g., see [1]). Recently, an important case of an ac field of high frequency ω » v F /R (v F is the Fermi velocity and R is the radius of the metallic ring) has been considered [2]. This consideration is based on the assumption that the position dependent time-varying electromagnetic field produces the static electron energy minibands in the ring which appear due to electron motion in a time-averaged electrostatic potential periodic with coordinate along the ring circumference, produced by the square of an ac electric field [3]. it should be noted that, in the quantum case, an electron reflection from an oscillating potential causes a time-dependent phase shift, resulting in an effective chaotization of the phase of electron wave function, except at energy multiples of ħω.Item Open Access Entanglement and its operational measure(Springer, 2006) Klyachko, Alexander A.; Öztop, Barış; Shumovsky, Alexander S.An operational representation of concurrence measuring the entanglement of bipartite systems by means of averages of basic observables is discussed. We prove the validity of this representation for bipartite systems with any dimension of a single-party Hilbert space. We show that Wigner-Yanase "skew" information gives a reasonable estimation of the amount of entanglement (in ebits) carried by mixed two-qubit states.Item Open Access General entanglement(IOP, 2006) Klyachko, Alexander A.; Shumovsky, Alexander S.The paper contains a brief review of an approach to quantum entanglement based on analysis of dynamic symmetry of systems and quantum uncertainties, accompanying the measurement of mean value of certain basic observables. The latter are defined in terms of the orthogonal basis of Lie algebra, corresponding to the dynamic symmetry group. We discuss the relativity of entanglement with respect to the choice of basic observables and a way of stabilization of robust entanglement in physical systems.Item Open Access Locality of quantum electromagnetic radiation(Apeiron, 2002) Shumovsky, Alexander S.; Horzela, A.; Kapuscik, E.Item Open Access Multipole radiation in quantum domain(Springer, 2003) Shumovsky, Alexander S.; Can, M. Ali; Soykal, Öney; Shumovsky, Alexander S.; Rupasov, V. I.We review recent results based on the application of spherical wave representation to description of quantum properties of multipole radiation generated by atomic transitions. In particular, the angular momentum Angular momentum of photons including the angular momentum entanglement, the quantum phase of photons, and the spatial properties of polarization are discussed.Item Open Access Persistent perfect entanglement in atomic systems(IOP, 2004) Çakır, Özgür; Can, M. Ali; Klyachko, Alexander A.; Shumovsky, Alexander S.It is shown that the system of an even number of three-level atoms in the Λ configuration in a cavity can evolve into a persistent maximum entangled state. The time of formation of such an entangled state is estimated.Item Open Access Polarization of free electromagnetic field and electromagnetic radiation in quantum domain(Institute of Physics Publishing, 1998-07-06) Shumovsky, Alexander S.Il is shown that conventional disreg;ird.of lo.ngitudinal component, which always e~ists iil radiation ofa localized source, can lead to some. qualitative errors in the description 9f polarization within the quantum domain. A new definition of gcneral\zed Sto.kes pijrameters an:d corresponding operators is discussed.Item Open Access Preface(Springer, 1997) Hakioğlu, Tahsin Tuğrul; Shumovsky, Alexander S.; Hakioğlu, Tahsin Tuğrul; Shumovsky, Alexander S.Item Open Access Preface(Springer, 2003) Shumovsky, Alexander S.; Shumovsky, Alexander S.; Rupasov, V. I.Item Open Access Quantifying quantum information via uncertainties(OSA, 2007) Öztop, Barış; Klyachko, Alexander A.; Shumovsky, Alexander S.We show, for a state ψ of a quantum system with the dynamic symmetry given by the Lie group G, total amount of quantum information and entanglement is provided by summarized uncertainty of basic observables.Item Open Access Quantum multipole radiation(John Wiley & Sons, 2001) Shumovsky, Alexander S.The author reviews investigations of the photon localization and quantum phase problems based on the use of the representation of multipole photons. Section II presents a general consideration of the field quantization, including a comparison of zero‐point oscillations of the plane and multipole waves of photons. Section III discusses the atom‐field interaction leading to the multipole radiation. The SU(2) quantum phase representation of atomic variables is considered, as is a connection between the SU(2) quantum phase states and entanglement phenomenon. In Section IV the author describes the quantum phase of multipole radiation caused by the angular momentum conservation in the process of radiation. This approach is compared with the Pegg–Barnett formalism and with Mandel's operational approach. Section V covers the quantum polarization properties of multipole radiation. Photon localization, quantum measurements, and causality are considered in Section VI.Item Open Access Quantum optics and solid state spectroscopy(Springer, 1997) Shumovsky, Alexander S.Possibility of formation of strongly correlated states of the bosonic excitations in solids similar to the squeezed states of photons is considered. The possibility of observation of these states in optical spectroscopy is discussed.Item Open Access Single qutrit entanglement(OSA, 2007) Binicioğlu, Sinem; Klyachko, Alexander A.; Shumovsky, Alexander S.We discussed a recent approach to quantum entanglement. The approach is based on presetting of basic observables of quantum system. Entangled states are interpreted as states with maximal amount of uncertainty of all basic observables.