Phase-space-density limitation in laser cooling without spontaneous emission
| Autor: | Daniel Comparat, H. Lignier, Thierry Chanelière |
|---|---|
| Přispěvatelé: | Nanophysique et Semiconducteurs (NPSC), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Quantum Physics Uncertainty principle Field (physics) [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph] Degrees of freedom (physics and chemistry) FOS: Physical sciences Space (mathematics) 01 natural sciences 010305 fluids & plasmas Computational physics Momentum [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] Phase space Laser cooling 0103 physical sciences Spontaneous emission 010306 general physics Quantum Physics (quant-ph) ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review A Physical Review A, American Physical Society, 2018, 98 (6), pp.063432. ⟨10.1103/PhysRevA.98.063432⟩ |
| ISSN: | 1050-2947 1094-1622 |
| Popis: | We study the possibility to enhance the phase space density of non-interacting particles submitted to a classical laser field without spontaneous emission. We clearly state that, when no spontaneous emission is present, a quantum description of the atomic motion is more reliable than semi-classical description which can lead to large errors especially if no care is taken to smooth structures smaller than the Heisenberg uncertainty principle. Whatever the definition of position - momentum phase space density, its gain is severely bounded especially when started from a thermal sample. More precisely, the maximum phase space density, can only be improved by a factor M for M-level atoms. This bound comes from a transfer between the external and internal degrees of freedom. To circumvent this limit, one can use non-coherent light fields, informational feedback cooling schemes, involve collectives states between fields and atoms, or allow a single spontaneous emission even Comment: 3 figures, 4 pages |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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