Browsing by Subject "Quantums"
Now showing items 120 of 47

Anomalous optical bistability and robust 2 entanglement of mechanical oscillators 3 using twophoton coherence
(Optical Society of America, 20150325)We analyze the optical bistability and the entanglement of two movable mirrors coupled to a twomode laser in a doubly resonant cavity. We show that in stark contrast to the usual reddetuned condition for observing ... 
Asymptotic dynamics of quantum discord in open quantum systems
(IOP Publishing, 2011)It is well known that quantum entanglement makes possible certain tasks in quantum information theory. However, there are also quantum tasks that display the quantum advantage without entanglement. Distinguishing classical ... 
Autocorrelation function of microcavityemitting field in the linear regime
(The European Physical Journal, 20080418)We study the photon statistics of the field emitted from a semiconductor microcavity containing a quantum well. We present an analytical expression of the autocorrelation function in nonresonant pumping. A dynamical ... 
Beam splitting and entanglement generation: excited coherent states
(Springer, 20120111)We study the mathematical properties of the excited coherent states,which are obtained through actions of a photon creation operator of the mode optical ﬁeld on its corresponding coherent state, by analyzing the minimal ... 
Bipartite entanglement of nonlinear quantum systems in the context of the qHeisenberg Weyl algebra
(Springer, 20110603)In this paper, we study in detail the degree of entanglement of bipartite system states in the context of qHeisenbergWely algebra. We examine the entanglement properties for two systems of arbitrary deformation ... 
Bipartite entanglement of nonlinear quantum systems in the context of the qHeisenberg Weyl algebra
(Springer, 2011)In this paper, we study in detail the degree of entanglement of bipartite system states in the context of qHeisenbergWely algebra. We examine the entanglement properties for two systems of arbitrary deformation parameters ... 
Bunching and Antibunching in Cavity QED
(Chinese Physical Society and IOP Publishing Ltd, 20110307)We study the statistics of the emitted ﬁled from Rydberg atom conﬁned inside a microcavity and interacting with a pump laser in the strong coupling regime. We explore the manifestation of the antibunching in connection ... 
Cavity QED effects in semiconductor microcavitie
(IOP Publishing, 19881105)A theoretical investigation of cavity QED effects in semiconductor microcavities containing quantum wells is presented. A model Hamiltonian is used to derive equations of motion for the quantum photon and exciton fields ... 
Chiral Spin Flipping Gate Implemented in IBM Quantum Experience
(Natural science publishing, 20170901)A chiral spin ﬂipping gate is simulated by specially designed quantum circuits. We consider using ancillary qubits to accomplish the algorithm as well as quantum circuits based on different basic operations. Three methods ... 
Clustering of exceptional points and dynamical phase transitions
(American Physical Society, 20160425)The eigenvalues of a nonHermitian Hamilton operator are complex and provide not only the energies but also the lifetimes of the states of the system. They show a nonanalytical behavior at singular (exceptional) points (EPs). ... 
Coherence and information dynamics of a Λtype threelevel atom interacting with a damped cavity ﬁeld
(SpringerVerlag, 20170215)An analytical description of a threelevel atom in an optical cavity coupled to the environment is obtained. The Husimi function and the Wehrl density are calculated to investigate the information loss dynamics of the phase ... 
A comparative study of negativity and concurrence based on spin coherent states
(World Scientiﬁc Publishing Company, 20100110)In this paper, we investigate two diﬀerent entanglement measures, the negativity and concurrence, in the case of pure and mixed states of twoqubit system basing on the spin coherent states. For twoqubit pure states, the ... 
Concurrence in the framework of coherent states
(Springer, 20090729)The concurrence of a twoqubit nonorthogonal pure state is determined through the construction of this state in the language of spin coherent states.The generalization of this method to the case of a class of mixed stats ... 
Controllable nonlinear effects in an optomechanical resonator containing a quantum well
(The American Physical Society, 2012)We study nonlinear effects in an optomechanical system containing a quantum well. The nonlinearity due to the optomechanical coupling leads to a bistable behavior in the mean intracavity photon number and substantial squeezing ... 
Degree of Entanglement and Violation of Bell Inequality by TwoSpin1/2 States
(Chinese Physical Society and IOP Publishing Ltd, 2011)Bell inequality is violated by the quantum mechanical predictions made from an entangled state of the composite system. In this paper we examine this inequality and entanglement measures in the construction of the coherent ... 
Dynamical behavior of entanglement in semiconductor microcavities
(Elsevier, 2010)We investigate the evolution of entanglement in a semiconductor cavity QED containing a quantum well. By using the Wehrl entropy and introducing generalized concurrence as entanglement measures, we study the inﬂuence of ... 
Dynamics of atoms interacting with offresonant strong laser pulses
(Taylor & Francis, 20101110)We study the dynamics of a twolevel system driven by a strong offresonant electromagnetic field. We derive an analytical solution for arbitrary pulse shape and discuss possible applications of the results obtained. 
Enhancement of photon intensity in forced coupled quantum wells inside a semiconductor microcavity
(American Physical Society, 20130227)We study numerically the photon emission from a semiconductor microcavity containing N 2 quantum wells under the influence of a periodic external forcing. The emission is determined by the interplay between external ... 
Entanglement of more general twoqubit states
(Simplex Academic Publishers, 20101115)In this paper, we investigate the degree of entanglement for more general twoqubit states in the construction of spin coherent states. As a measure of entanglement, we use the concurrence and we study its behavior as a ... 
Entanglement of twoqubit nonorthogonal states
(World Scientiﬁc Publishing Company, 20090330)We studied the entangled twoqubit nonorthogonal pure states through spin coherent states. Using the concurrence as a measure of entanglement we express it as a function of the amplitudes of those states and find conditions ...