Squeezing in strong light scattered by a regular structure of atoms

Lin, Jin; Macovei, Mihai; Gong, Shangqing; Keitel, Christoph H.; Evers, Jörg

doi:10.1016/j.optcom.2009.10.043

Cited by 10 publications

(17 citation statements)

References 33 publications

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“…If one would further reduce the minor in the condition (7) to the dimension 2x2, it is easy to see that the resulting minors are always non-negative. Hence the entanglement condition (8) under study is a rather simple example, but it will turn out in the following to be sufficient for demonstrating entanglement in resonance fluorescence.…”

Section: Arxiv:10012448v2 [Quant-ph] 10 Mar 2010mentioning

confidence: 99%

See 1 more Smart Citation

Entanglement in Atomic Resonance Fluorescence

Grünwald

Vogel

2010

Phys. Rev. Lett.

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The resonance fluorescence from regular atomic systems is shown to represent a continuous source of nonGaussian entangled radiation propagating in two different directions. For a single atom entanglement occurs under the same conditions as squeezing. For more atoms, the entanglement can be more robust against dephasing than squeezing, hence providing a useful continuous source for various applications of entangled radiation. PACS numbers: 42.50.Dv, 03.67.Bg, 32.50.+d, 03.65.Ud The resonance fluorescence of a single atom played an outstanding role when searching for a radiation source that clearly displays the quantum nature of light. A single twolevel atom, after being excited by a driving laser, can only emit a single photon at once and then it must be re-excited, before another photon can be emitted. This feature led to the prediction of the nonclassical effect of photon antibunching [1], which could first be demonstrated in the resonance fluorescence of an atomic beam [2] and later with a trapped ion [3].Sub-Poissonian photon statistics could also be observed for the first time in resonance fluorescence [4] and squeezing in resonance fluorescence was predicted [5]. Even the resonance fluorescence of many atoms can show squeezing, which requires stable phase relations between the emitters. This can be achieved by a regular arrangement of the atoms [6], or by detection of the fluorescence in the forward direction with respect to the pump beam [7]. Squeezing from strongly driven regular atomic systems has also been studied [8]. In an early experiment with regular atoms, the interference of the fluorescence of two trapped ions was demonstrated [9]. Squeezing in resonance fluorescence could be observed for samples of many atoms [10].A direct demonstration of squeezing in the resonance fluorescence of a single atom has not been realized yet. For this purpose it was proposed to apply homodyne correlation measurements [11]. The method has been further developed to detect general field correlation functions by balanced homodyne correlation techniques [12]. This opens possibilities to study the most general nonclassical features of the atomic resonance fluorescence radiation [13]. As an example, intensityfield correlation functions could be measured in resonance fluorescence [14], which is a first step in such a direction.In the context of applications for quantum information processing, among the manyfold of nonclassical effects entanglement became of particular importance, for recent reviews see [15,16]. A variety of possibilities to create entanglement in atoms, e.g. via cooperative fluorescence, has been studied, see [17] and references therein. A cold atom in a cavity can serve as a stable source for entangled EPR-type photons, * Electronic address: peter.gruenwald2@uni-rostock.de † Electronic address: werner.vogel@uni-rostock.de by utilizing the coupling between the scattered photons and the quantized atomic center-of-mass motion [18]. To our best knowledge, however, the resonance fluorescence radiation itself...

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Section: Arxiv:10012448v2 [Quant-ph] 10 Mar 2010mentioning

confidence: 99%

“…This can be achieved by a regular arrangement of the atoms [6], or by detection of the fluorescence in the forward direction with respect to the pump beam [7]. Squeezing from strongly driven regular atomic systems has also been studied [8]. In an early experiment with regular atoms, the interference of the fluorescence of two trapped ions was demonstrated [9].…”

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confidence: 99%

Entanglement in Atomic Resonance Fluorescence

Grünwald

Vogel

2010

Phys. Rev. Lett.

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“…Further, the atomic dressed-basis operators are defined as: R z = |2 2 | − |1 1 |, R + = |2 1 | and R − = |1 2 | while obeying the commutation relations [R + , R − ] = R z , and [R z , R ± ] = ±2R ± , respectively. γ ± and γ 0 are the single-atom dressed-state spontaneous decay rates at the frequencies ω L ± 2Ω and ω L [35], respectively, while [1] …”

Section: Analytical Approachmentioning

confidence: 99%

Cooling a two-level emitter in photonic-crystal environments

Cerbu

Macovei

2014

Phys. Rev. A

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We investigate the resonant cooling phenomena of a driven two-level radiator embedded in a photonic crystal structure. We find that cooling occurs even at laser-atom-frequency resonance. This happens due to the atomic dressed-states coupling with different strengths resulting in population redistribution and cooling. Furthermore, for off-resonant driving the two-level particle can be in either ground or excited bare-state, respectively. This may help in engineering of novel amplified optical devices as well as highly coherent light sources.

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“…where g(ω) characterizes the atom-environment coupling strength [29][30][31][32][33][34]. In the next subsections, we shall obtain the equations of motion as well as the expression for the optical force acting on a strongly driven two-level particle in various environments.…”

Section: Quantum Dynamics In Moderately Strong Laser Fields and Mmentioning

confidence: 99%

“…This is somehow surprising as one may expect the force to be larger for bigger intensities. Note also that modified environmental reservoirs are responsible for recovering of the interference pattern [29], enhanced squeezing [30], population inversion [31] or thresholdless lasing [32].…”

Section: Introductionmentioning

confidence: 99%