Combined effect of detuning and Stark shift on atomic dipole squeezing in nondegenerate two-photon processes

Generation of dipole squeezing in a two-mode system with entangled coherent states of a quantized electromagnetic field

“…Squeezed states [1,21,22] are distinguished by the property that the quantum fluctuations in a dynamical observable may be reduced below the standard quantum noise limit at the expense of increased fluctuations in its canonical conjugated variable without violating the Heisenberg uncertain relation. Since the first observation of squeezed states of light, the generation of squeezed states has been the subject of an intense theoretical and experimental activity [1,[23][24][25]. The study of these states provides a fundamental understanding of quantum fluctuations and opens a way for new schemes [1,[23][24][25] of quantum communication or imaging beating the standard quantum noise limit.…”

“…Since the first observation of squeezed states of light, the generation of squeezed states has been the subject of an intense theoretical and experimental activity [1,[23][24][25]. The study of these states provides a fundamental understanding of quantum fluctuations and opens a way for new schemes [1,[23][24][25] of quantum communication or imaging beating the standard quantum noise limit. It has been predicted that a number of physical systems [1,[23][24][25][26][27]] (e.g., four-wave mixing, two-photon laser, parametric amplifiers and Raman scattering) can generate squeezed states of the radiation field.…”

“…The study of these states provides a fundamental understanding of quantum fluctuations and opens a way for new schemes [1,[23][24][25] of quantum communication or imaging beating the standard quantum noise limit. It has been predicted that a number of physical systems [1,[23][24][25][26][27]] (e.g., four-wave mixing, two-photon laser, parametric amplifiers and Raman scattering) can generate squeezed states of the radiation field. Also, it is known that atomic dipole squeezing (ADS) [16] could be generated through many kinds of nonlinear optical processes [16,[28][29][30][31], such as resonance fluorescence, cooperative Dicke system, Rydberg atom maser, and so on.…”

Field and dipole squeezing in a driven degenerate Λ quantum-beat system

“…We study the field and atomic dipole squeezing in this system without making any further approximation except for the dipole and rotating-wave approximations in obtaining the model Hamiltonian. In recent years, increased attention has been paid to the squeezing of fluctuations of the atomic dipole variables [11][12][13][14][15][16]. It has been shown that squeezed atoms can radiate squeezed light [12], and a relationship between field and atomic squeezing has been established under different initial conditions for the field and atom [12,13].…”