Perte de cohérence dans la réflexion d'atomes sur une onde évanscente

Henkel, Corinna; Aspect, Alain; Courtois, Jean; Kaiser, R.; Molmer, K.; Westbrook, Christoph I

doi:10.1051/anphys:199556052

Cited by 8 publications

(17 citation statements)

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“…This regime has not yet been thoroughly explored in experiments, though it should lead to interesting quantum effects [33,34]. known [27,36,37], while the real path is more difficult to calculate.…”

Section: Diffraction Intensities: Semiclassical Perturbation Methodsmentioning

confidence: 99%

“…[The quantization axis is parallel to the magnetic field vector.] The degeneracy of the sublevels is lifted by the light field because the diagonal elements of the optical potential matrix (27) [see inset of Fig.7(a)]. As a consequence, the potentials for the diffraction orders ν = 0, −2 cross when the difference between the light shifts −1/2|V (z)|−1/2 and +1/2|V (z)|+1/2 is larger than twice the Doppler shift.…”

Section: Physical Picturementioning

confidence: 99%

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Theory of atomic diffraction from evanescent waves

Henkel¹,

Wallis

Westbrook

et al. 1999

Appl Phys B

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We review recent theoretical models and experiments dealing with the diffraction of neutral atoms by a reflection grating, formed by a standing evanescent wave. We analyze diffraction mechanisms proposed for normal and grazing incidence, point out their scopes and confront the theory with experiment. PACS: 32.80.Lg Mechanical effects of light on atoms -42.25.Fx Diffraction and scattering -03.75.Dg Atom interferometry

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Section: Diffraction Intensities: Semiclassical Perturbation Methodsmentioning

confidence: 99%

Section: Physical Picturementioning

confidence: 99%

Theory of atomic diffraction from evanescent waves

Henkel¹,

Wallis

Westbrook

et al. 1999

Appl Phys B

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“…[9]. Besides the constant phase shift associated with the average optical potential [8], the intensity variations of the laser lead to an additional phase shift 5y, (t), which is obtained by integration of the perturbation potential (18) along the unperturbed atomic trajectory (4) corresponding to atoms reaching position z =Z at time r after reflection on the evanescent wave mirror (see Fig. 2):…”

Section: Derivation Of the Laser Phase Shiftmentioning

confidence: 99%

Quantum nondemolition measurements using a crossed Kerr effect between atomic and light fields

Courtois¹,

Courty²,

Reynaud³

1995

Phys. Rev. A

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We analyze the coupling between the fluctuations of an atomic beam incident on an evanescent wave mirror and the fluctuations of the laser beam producing the evanescent potential barrier. We show that this coupling is equivalent to a crossed Kerr efFect between an atomic field and a light field, and that the consistency of the theory requires that both fields be subject to symmetrical commutation relations and quantum fluctuations. We show in particular that the phase shift undergone by the light field during the atomic reflection process permits a quantum nondemolition measurement of the incident atomic intensity.PACS number(s): 42.50.p, 03.70.+k

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“…Higher guide modes expand more rapidly with smaller transverse de Broglie wavelengths, scaling as dB * a 0 = n p for the nth excited guide mode. Reflection remains sharp for dB =2 50 nm, but as dB approaches the mirror decay length, momentum-dependent mode dephasing increases [20]. This reduces reimaging fidelity, quantified in Fig.…”

mentioning

confidence: 98%

“…For light-based mirrors, the low incident velocities allow far-detuned light for suppression of spontaneous emission and highly specular reflection [19]. Additionally, dB values associated with the wave packet expansion greatly exceed the mirror decay lengths, giving a steplike potential with minimal relative dephasing on reflection [20] and transverse box eigenmodes closely approaching those of a square well.…”

mentioning

confidence: 99%