Sub-poissonian loading of single atoms in a microscopic dipole trap

• Published in: Nature (London) 2001-06, Vol.411 (6841), p.1024-1027
• Main Authors: Grangier, Philippe, Schlosser, Nicolas, Reymond, Georges, Protsenko, Igor
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Atomic properties and interactions with photons; Atoms & subatomic particles; Classical and quantum physics: mechanics and fields; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Humanities and Social Sciences; Ions; letter; Mechanical effects of light on atoms, molecules, electrons, and ions; multidisciplinary; Optical cooling of atoms; trapping; Optics; Photon interactions with atoms; Physics; Quantum information; Quantum optics; Quantum Physics; Quantum theory; Science; Science (multidisciplinary); Trapping
• ISSN: 0028-0836; 1476-4687
• DOI: 10.1038/35082512

The ability to manipulate individual atoms, ions or photons allows controlled engineering of the quantum state of small sets of trapped particles; this is necessary to encode and process information at the quantum level. Recent achievements in this direction have used either trapped ions or trapped photons in cavity quantum-electrodynamical systems. A third possibility that has been studied theoretically is to use trapped neutral atoms. Such schemes would benefit greatly from the ability to trap and address individual atoms with high spatial resolution. Here we demonstrate a method for loading and detecting individual atoms in an optical dipole trap of submicrometre size. Because of the extremely small trapping volume, only one atom can be loaded at a time, so that the statistics of the number of atoms in the trap, N, are strongly sub-poissonian (ΔN2   0.5N). We present a simple model for describing the observed behaviour, and we discuss the possibilities for trapping and addressing several atoms in separate traps, for applications in quantum information processing.