Coherent population trapping in a dressed two-level atom via a bichromatic field
نویسنده
چکیده
We show theoretically that by applying a bichromatic electromagnetic field, the dressed states of a monochromatically driven two-level atom can be pumped into a coherent superposition termed as dressed-state coherent population trapping. Such effect can be viewed as a new doorknob to manipulate a two-level system via its control over dressed-state populations. Application of this effect in the precision measurement of Rabi frequency, the unexpected population inversion and lasing without inversion are discussed to demonstrate such controllability. PACS numbers: 42.50.Hz, 32.80.Qk
منابع مشابه
ar X iv : q ua nt - p h / 06 06 01 3 v 1 1 Ju n 20 06 Collective coherent population trapping in a thermal field
We analyzed the efficiency of coherent population trapping (CPT) in a superposition of the ground states of three-level atoms under the influence of the decoherence process induced by a broadband thermal field. We showed that in a single atom there is no perfect CPT when the atomic transitions are affected by the thermal field. The perfect CPT may occur when only one of the two atomic transitio...
متن کاملCoherent beam splitter for atoms based on a bichromatic standing light wave.
We propose a new coherent atomic beam splitter that is based on the induced redistribution of photons in the intense field of two collinear standing waves with different frequencies. In the dressed-atom approach, we show that this scheme can provide a clear large-angle splitting into two components without being restricted to the Raman-Nath regime.
متن کاملQuantum interference in optical fields and atomic radiation
We discuss the connection between quantum interference effects in optical beams and radiation fields emitted from atomic systems. We illustrate this connection by a study of the firstand second-order correlation functions of optical fields and atomic dipole moments. We explore the role of correlations between the emitting systems and present examples of practical methods to implement two system...
متن کاملCoherent Control of Quantum Entropy via Quantum Interference in a Four-Level Atomic System
The time evaluation of quantum entropy in a four-level double- type atomic system is theoretically investigated. Quantum entanglement of the atom and its spontaneous emission fields is then discussed via quantum entropy. It is found that the degree of entanglement can be increased by the quantum interference induced by spontaneous emission. The phase dependence of the atom-field entanglement is...
متن کاملHigh-contrast dark resonances with linearly polarized light on the D1 line of alkali atoms with large nuclear spin.
High-contrast coherent population trapping signals were observed on the Cs D1 line by use of a bichromatic linear polarized light (lin‖lin field). A maximum absorption contrast of about 10% was obtained. This was nearly twice as high as that measured with the standard configuration of bichromatic circularly polarized light (σ-σ field). The results are compared with density matrix calculations o...
متن کامل