Collisional decoherence of polar molecules

Walter, Kai; Stickler, Benjamin A.; Hornberger, Klaus

doi:10.1103/physreva.93.063612

Cited by 13 publications

(15 citation statements)

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“…The width of the transmitted stripe was independent of the molecular species which excluded an increase in surface diffusion. Finally, collisions with gas molecules can also lead to the suppression of quantum interference , and the influence of the molecular dipole moment on collisional decoherence was discussed in . However, tests in the current setup showed that the momentum transfer from a single gas particle is sufficient to deflect the molecule way beyond the small detection region (400 × 400 μm 2 ), leaving the contrast unaffected.…”

Section: Resultsmentioning

confidence: 81%

On the role of the electric dipole moment in the diffraction of biomolecules at nanomechanical gratings

Knobloch

Stickler

Brand

et al. 2016

Fortschritte der Physik

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We investigate effects of a permanent electric dipole moment on matter‐wave diffraction at nanomechanical gratings. Specifically, the diffraction patterns of hypericin at ultra‐thin carbonaceous diffraction masks are compared with those of a polar and a non‐polar porphyrin derivative of similar mass and de Broglie wavelength. We present a theoretical analysis of the diffraction of a rotating dipole highlighting that small local electric charges in the material mask can strongly reduce the interference visibility. We discuss the relevance of this finding for single grating diffraction and multi‐grating interferometry with biomolecules.

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Section: Resultsmentioning

confidence: 81%

On the role of the electric dipole moment in the diffraction of biomolecules at nanomechanical gratings

Knobloch

Stickler

Brand

et al. 2016

Fortschritte der Physik

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“…Thus, the orientation enters only in parametric fashion, which allows us to give closed form expressions for the spatioorientational localization rate. This separation of time scales proved valid already for atom-molecule scattering experiments [42], and was used to describe the orientationally averaged center-of-mass decoherence of polar molecules [43] and the purely orientational decoherence [44] in an isotropic environment [45]. We will also show how this treatment can be naturally extended to a gas of photons, as required to describe decoherence by thermal radiation.…”

Section: Introductionmentioning

confidence: 80%

Spatio-orientational decoherence of nanoparticles

2016

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Motivated by trapping and cooling experiments with non-spherical nanoparticles, we discuss how their combined rotational and translational quantum state is affected by the interaction with a gaseous environment. Based on the quantum master equation in terms of orientation-dependent scattering amplitudes, we evaluate the localization rate for gas collisions off an anisotropic van der Waals-type potential and for photon scattering off an anisotropic dielectric. We also show how pure angular momentum diffusion arises from these open quantum dynamics in the limit of weak anisotropies.

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“…the development of collisional-decoherence models that take into account both spatial and orientational decoherence of anisotropic molecules [181][182][183][184][185]; predictions derived from these models are in good agreement with experimental data [184].…”

Section: A Endogenous Heat Radiationmentioning

confidence: 64%

Quantum decoherence

2019

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Quantum decoherence plays a pivotal role in the dynamical description of the quantum-to-classical transition and is the main impediment to the realization of devices for quantum information processing. This paper gives an overview of the theory and experimental observation of the decoherence mechanism. We introduce the essential concepts and the mathematical formalism of decoherence, focusing on the picture of the decoherence process as a continuous monitoring of a quantum system by its environment. We review several classes of decoherence models and discuss the description of the decoherence dynamics in terms of master equations. We survey methods for avoiding and mitigating decoherence and give an overview of several experiments that have studied decoherence processes. We also comment on the role decoherence may play in interpretations of quantum mechanics and in addressing foundational questions.Keywords: quantum decoherence, quantum-to-classical transition, quantum measurement, quantum master equations, quantum information, quantum foundationsIn memory of H. Dieter Zeh 1 Of course, this must not be read as saying that S was already in |s 1 (i.e., "went through slit 1") prior to the measurement of E. Nor does it mean that the result of a subsequent path measurement on S is necessarily determined, by virtue of the measurement on E, prior to this S-measurement's actually being carried out. After all, as Peres [53] has cautioned us, unperformed measurements have no outcomes. So while the picture of E as "encoding which-path information" about S is certainly suggestive and helpful, it should be used with an understanding of its conceptual pitfalls. 6

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Collisional decoherence of polar molecules

Cited by 13 publications

References 50 publications

On the role of the electric dipole moment in the diffraction of biomolecules at nanomechanical gratings

On the role of the electric dipole moment in the diffraction of biomolecules at nanomechanical gratings

Spatio-orientational decoherence of nanoparticles

Quantum decoherence

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