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Chinese journal of atomic and molecular physics

Coherence properties of a trapped ion in the thermal radiation modei standing wave fields

Gao Feng

Published Jan 1, 2004• 0 citations
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Abstract

The coherence of trapped ion being put in a thermal radiation model standing wave field through an external controllable driving field is investigated. The time evolution properties of non-opposite angle element of trapped ion's reducible density rectangular array is discussed. Coherence properties of trapped ion is studied when the trapped ion interacts with an driving field in the thermal radiation model standing wave field. We obtain the properties of an external driving field when trapped ion's coherence is maintained.

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Acta Physica Sinica•Jan 1, 2010•3 citations
The coherence of trapped ion being put in a thermal radiation model standing wave field through an external controllable driving field is investigated. The time evolution properties of non-opposite angle element of trapped ion's reducible density rectangular array is discussed. Coherence properties of trapped ion is studied when the trapped ion interacts with an driving field in the thermal radiation model standing wave field. We obtain the properties of an external driving field when trapped ion's coherence is maintained.
The time evolution properties of non opposite angle element of two level atoms reducible density rectangular array was discussed.Coherence properties of two level atom was studied in one photon processes when the two level atom interacts with an driving field in the thermal radiation field.When two level atoms coherence is maintained,the theoretical result demonstrates that time evolution of an external driving field is closely related to atomic jump frequency,atomic motion velocity and the average of k modul photon number etc.
The coherence of two-level atom in a thermal radiation field without rotating wave approximation through an external controllable driving field was investigated. The time evolution properties of non-opposite angle element of two-level atom's reducible density rectangular array was discussed. Coherence properties of two-level atom was studied in degenerate two-photon processes when the two-level atom interacts with an driving field in the thermal radiation field . We obtained the properties of an external driving field when two-level atom's coherence is maintained.
Starting from the Jaynes-Cummings (J-C) model describing interaction of a trapped ion with a standing-wave laser field, we derive the interaction Hamiltonian on the nonlinear J-C model of the trapped ion excitated resonantly with 1-quantum vibrational mode. After solving the time-dependent states of this model,the entropy evolution of the ion are investigated numerically related with Lamb-Dick parameter,the position of the ion in the standing-wave laser field and the initial number of phonon. It is shown that the entropy evolution exhibit nonperiodicity vibration. With the increasing of the parameter, it will increase the frequency of the vibration,therefore the less time of disentanglement between the internal and external degrees of freedom of a trapped ion. When moving the ion from the node of the standing-wave laser to the antinode,the frequency of the vibration becomes less,the longer time of the disentanglement between the internal and external degrees of freedom. With the more initial number of phonon , the entropy evolution of the ion is similar to the field entropy evolution of Jaynes-Cummings model, and the vibration frequency become less gradually.
The time evolution properties of the field quantum entropy in the system of a trapped ion interacting resonantly with a standing-wave laser field is studied by utilizing the Von Neumann reduced quantum entropy theory, and our attention focuses on the discussion of the influence of the Lamb-Dick parameter, the position of the ion in the standing-wave laser field and the initial state of the trapped ion on the evolution properties of the field quantum entropy. The results obtained from the numerical calculation indicate that: the value of the Lamb-Dick parameter effect the oscillation frequency and amplitude of the quantum entanglement between the trapped ion and the standing-wave laser field, the larger the Lamb-Dick parameter is, the weaker the average entanglement level between the ion and the field will be. When moving the tapped ion from the node of the standing-wave laser to the loop, the vibration frequency of the quantum entanglement between the field and the ion becomes slow gradually, and the entanglement degree gets weaker and weaker. With the decrease of the probability of the trapped ion being in the excited state, the quantum entanglement between the trapped ion and the stanging-wave laser field shows the tendency of increase first and then decrease. These properties have certain reference value for the preparation of entangled states and for the quantum communications with the thapped ion, and so on.