Effect of atomic coherence on the second- and higher-order squeezing in a two-photon three-level cascade atomic system

Ansari, Nadeem A.

doi:10.1103/physreva.48.4686

Cited by 63 publications

(51 citation statements)

References 14 publications

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“…The same can be achieved by pumping the atoms with external magnetic field when magnetic dipole transition is allowed. The coherence can also be induced by preparing the atoms initially in arbitrary coherent superposition of these levels [8][9][10][11][12][13][14] or by using these mechanisms simultaneously [15,16]. In the nondegenerate configuration, when the atoms spontaneously decay from |a to |c via the intermediate energy level |b , two photons with different frequencies are generated.…”

Section: Introductionmentioning

confidence: 99%

Changes in the statistical and quantum features of the cavity radiation of a two-photon coherent beat laser due to phase fluctuation

Tesfa

2010

Phys. Rev. A

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Detailed derivation of the master equation and the corresponding time evolution of the cavity radiation of a coherent beat laser when the atoms are initially prepared in a partial coherent superposition is presented. It turns out that the quantum features and intensity of the cavity radiation are considerably modified by the phase fluctuation arising due to the practical incapability of preparing atoms in the intended coherent superposition. New terms having an opposite sign with the contribution of the driving radiation emerged in the master equation. This can be taken as an indication for a competing effect between the two in the manifestation of the nonclassical features. This, on the other hand, entails that there is a chance for regaining the quantum properties that might have lost due to faulty preparation by engineering the driving mechanism and vice versa. In light of this, quite remarkably, the cavity radiation is shown to exhibit nonclassical features including two-mode squeezing and entanglement when there is no driving and if the atoms are initially prepared in a partial maximum atomic coherence superposition, contrary to earlier predictions for the case of perfect coherence.

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Section: Introductionmentioning

confidence: 99%

Changes in the statistical and quantum features of the cavity radiation of a two-photon coherent beat laser due to phase fluctuation

Tesfa

2010

Phys. Rev. A

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“…In recent years, interaction of three-level atoms with radiation has attracted a great deal of interest in relation to the strong correlation induced particularly during the cascading transitions [1][2][3][4][5][6][7][8][9][10][11][12][13]. It is common knowledge by now that the atomic coherence in such a system is accountable for the squeezing of the emitted radiation.…”

Section: Introductionmentioning

confidence: 99%

“…It is common knowledge by now that the atomic coherence in such a system is accountable for the squeezing of the emitted radiation. The atomic coherence can be induced in a three-level cascade scheme by coupling the upper energy level |a and lower energy level |c, between which a direct transition is dipole forbidden, with external radiation [1][2][3][4][5][6] or by preparing the atom initially in coherent superposition of these two levels [7][8][9][10][11][12] or using these mechanisms at the same time [13]. In addition to these options, Xu and Hu [14] have considered the two-step cascade coherent excitation.…”

Section: Introductionmentioning

confidence: 99%

Effect of biased noise fluctuations on the output radiation of coherent beat laser

Tesfa

2008

PMC Phys B

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Effect of biased noise fluctuations on the degree of squeezing as well as the intensity of a radiation generated by a one-photon coherent beat laser is presented. It turns out that the radiation exhibits squeezing inside and outside the cavity under certain conditions. The degree of squeezing is enhanced by the biased noise input significantly in both regions. Despite the presence of the biased environment modes outside the cavity, the degree of squeezing outside the cavity can be greater than or equal to or even less than the cavity radiation depending on the initial preparation of the atomic superposition and amplitude of the external driving radiation. But the intensity of the radiation is found to be lesser outside the cavity regardless of these parameters.

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“…Some authors have studied the squeezing and statistical properties of the light produced by a three-level laser in which the crucial role is played by the superposition of the top and bottom levels [1][2][3][4][5][6][7]. Ansari [7] has predicted that such a laser can generate under certain conditions squeezed light.…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that a three-level laser under certain conditions generates squeezed light [1][2][3][4][5][6][7][8][9]. In a cascade three-level laser, three-level atoms in a cascade configuration are injected into a cavity coupled to a vacuum reservoir via a single-port mirror.…”

Section: Introductionmentioning

confidence: 99%

Coherently driven degenerate three-level laser with parametric amplifier

Darge

Kassahun

2010

PMC Phys B

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We discuss the squeezing and statistical properties of the light produced by a coherently driven degenerate three-level laser with a parametric amplifier. We consider the case in which the atoms injected into the cavity are prepared in a coherent superposition of the top and bottom levels and with these levels coupled by the pump mode emerging from the parametric amplifier. It so happens that the presence of the parametric amplifier increases the squeezing and the mean photon number significantly. Furthermore, it is found that the maximum interacavity squeezing is 93% in the presence of the coupling and when the superposition has no contribution (h = 0). On the other hand, the maximum interacavity squeezing turns out to be 94% in the absence of the coupling. This squeezing is due to the parametric amplifier and the superposition. In addition, our calculation shows that one effect of coupling the top and bottom levels is to decrease the mean and the normally-ordered variance of the photon number.

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Effect of atomic coherence on the second- and higher-order squeezing in a two-photon three-level cascade atomic system

Cited by 63 publications

References 14 publications

Changes in the statistical and quantum features of the cavity radiation of a two-photon coherent beat laser due to phase fluctuation

Changes in the statistical and quantum features of the cavity radiation of a two-photon coherent beat laser due to phase fluctuation

Effect of biased noise fluctuations on the output radiation of coherent beat laser

Coherently driven degenerate three-level laser with parametric amplifier

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