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Journal of Atomic and Molecular Physics

Fidelity of quantum information of a tunneling quantum dot molecule model interacting with a cavity field

Zeng Xiao

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

The fidelities of quantum information of a tunneling quantum dot molecule model interacting with a cavity field are studied by means of the fully quantum theory and numerical calculations.With the help of the computer simulation,the time evolution of fidelity of the quantum dot molecule,the field and the system is obtained;the squeezing coefficient and the detuning impact on the quantum information fidelities, which is analyzed,the results show that we can adjust the quantum information fidelities by means of changing the squeezing coefficients of the initial optical field and the detuning in the system of interaction.

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The fidelities of quantum information of a tunneling quantum dot molecule model interacting with a cavity field are studied by means of the fully quantum theory and numerical calculations.With the help of the computer simulation,the time evolution of fidelity of the quantum dot molecule,the field and the system is obtained;the squeezing coefficient and the detuning impact on the quantum information fidelities, which is analyzed,the results show that we can adjust the quantum information fidelities by means of changing the squeezing coefficients of the initial optical field and the detuning in the system of interaction.
The fidelities of quantum information of two identical two-level atoms of entanglement state Raman interacting with the squeezed vacuum field are studied by means of the fully quantum theory and numerical calculations.The results shows the fidelity of system,atoms and field will drastically decrease as the squeezing parameter of the initial light increases,and that the fidelity is correlated with the degree of entanglement of the initial two identical two-level atoms and the intensity of dipole-dipole interaction between atoms.
The dipole-dipole interaction of the two atoms is discussed.By considering the in- teraction between the two-mode squeezing vacuum state field and the environment(atoms),we investigate the quantum information fidelities of the atoms the field and the system in two- mode squeezing vacuum state Tavis-Cummings model.With the help of the computer sim- ulation,the time evolution of fidelity of system,atoms and field is obtained.The result is indicate that r and k are important to the fidelity of the quantum information.When the two atoms are initially in the groud state,decreasing r can increase the three fidelities.On the contrary,when the two atoms are initially in one of the Bell states,increasing r can increase the three fidelites.
By means of numerical calculations,the squeezing property of the light field in the non-resonant system of two entangled atoms interacting with coherent field in dissipative cavity is studied.The effects of the detuning between the atom and cavity field,the initial field intensity,the decay of the cavity field on the light squeezing are discussed.The results show that when two entangled atoms interact with coherent field in the non-resonat system,light squeezing may occur,the squeezing degree has the periodicity with the time evolution.Also,the squeezing degree of light field becomes strong,the squeezing time increases,when the initial field intensity is adjusted appropriately.With the increase of the decay of the cavity field,the squeezing degree of light field gradually becomes weak,the squeezing time gradually decreases.
By means of numerical methods,the fidelity of the system of a fock state field interacting with the two two-level atoms have been studied.The effects of cavity-atoms detuning,photon number and manipulation of the atom on fidelity of the system are discussed.The results show that the information is undistorted completely in the initial moment in the absence of manipulation of the atom.Moreover the frequency of the oscillation,the peak and the period of fidelity of the system can be controlled by cavity-atoms detuning,photon number and manipulation of the atom.The Information is distorted in the initial moment in the presence of the manipulation of atom.Fidelity of the system can be controlled by the manipulation of the classical filed.
By means of the full quantum theory,we investigate the fidelity of quantum informationin an arbitrary(pure and mixed) states of the two identical atoms system in highly detunedcavity QED,the influence of the initial state of systems and the degree of the atoms coupledon the fidelity of quantum information is discussed,and the physical properties of the fidelityevolution is revealed.It is showed that the fidelity of systems evolves periodic,the amplitudeof the fidelity evolution is modulated by the mixture of the atoms,and the evolution frequencyis controlled by the degree of atoms coupled.Choose a suitable initial state of the two-atomscoupled parameter and controlling the interaction time properlyone can get a high fidelityoutput,and emerge periodic quantum echo.