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Journal of Anqing Teachers College

Coherence of a Λ-type Three-level Atom in the Interaction Resonantly with two-mode Squeezing Vacuum State Field

Guo-Mo Zeng

Published Jan 1, 2008• 0 citations
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Abstract

Through the Λ-type three-level atom interacting with two-mold squeezed vacuum field,we discussed the coherence of atomic system providing that.It is shown that with the increasing of squeezing factor,the coherent intensity between two levels decreased without the interaction with the light field,but the decoherence didn't appear;otherwise,the coherence also decreased,but the decoherence appeared finally.

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Journal of Jiangsu University of Science and Technology•Jan 1, 2005•0 citations
Through the Λ-type three-level atom interacting with two-mold squeezed vacuum field,we discussed the coherence of atomic system providing that.It is shown that with the increasing of squeezing factor,the coherent intensity between two levels decreased without the interaction with the light field,but the decoherence didn't appear;otherwise,the coherence also decreased,but the decoherence appeared finally.
The influences of detuning δ and initial squeezed light_field factor r on the light squeezing and Cauchy_Schwartz inequality in the system of two_mode squeezing vacuum field interacting non_resonantly with a Λ_type three_level atom is investigated.The results show that the light field is squeezed regularly. The light squeezing level is evidently relative to r and δ. With the increase r, the nonclassical correlation properties between the two mode cavities get steady. The detuning makes the nonclassical correlation degree steady.
Considering two Λ-type three-level atoms initially in the entangled state,one atom is poured into the cavity and interacts with a two-mode cavity.The dipole squeezing of an atom inside the cavity are investigated.The influences of the selective atomic measurement and the intensity of the coherent field which interacts with atom on dipole squeezing of an atom inside the cavity are discussed.The result obtained by numerical calculations shows that the dipole squeezing of an atom inside the cavity can be strengthened through selective atomic measurement for atom outside of the cavity.
Considering two Λ-type three-level atoms initially in the entangled state, one atom is poured into the cavity and interacts with a two-mode cavity. The squeezing and antibunching effects of the field are investigated. The influences of the selective atomic measurement and the intensity of the coherent field, which interacts with atom on squeezing and antibunching effect of the field, are discussed. The results obtained by numerical calculations show that squeezing and antibunching effect of the field can be strengthened through selective atomic measurement for atom outside of the cavity.
By means of numerical calculations,the dipole squeezing of a Λ-type three-level atom interacting with two-mode entangled coherent states is investigated.The influences of the degree of entanglement of two-mode entangled coherent optics field and mean photon numbers of two-mode optics field on dipole squeezing of a Λ-type three-level atom are discussed.The results show that squeezing effect weakens with increase of degree of entanglement of two-mode entangled coherent optics field and with increasing of mean photon numbers of two-mode entangled coherent optics field.
By means of numerical calculations,squeezing effect of the field in the system of two-mode entangled coherent states interacting with a Λ-type three-level atom is investigated.The influences of the degree of entanglement of two-mode entangled coherent state optics field and mean photon numbers of two-mode optics field on squeezing effect are discussed.The results show that squeezing effect strengthens with increasing of the the degree of entanglement of two-mode entangled coherent state optics field and weakens with increasing of mean photon numbers of two-mode entangled coherent state optics field.
By using the full quantum theory,the time evolution of atomic dipole squeezing parameters of a Λ-type three-level atom interacting with a single-mode coherent cavity field is investigated.The influence of the initial coherent-field intensity,the initial atomic coherence,the initial populations on the two lower atomic levels and their energy splitting on the atomic dipole squeezing are studied.Results show that the amount of dipole squeezing increases while the duration of dipole squeezing decreases with increasing initial field intensity.In the case of degenerate lower atomic states maximum dipole squeezing is reached when the two states have equal initial phases and equal populations.Exchange of initial populations in the lower atomic states does not influence time evolution of diploe squeezing.Atomic energy level splitting is helpful to dipole squeezing generation under certain conditions.