Abstract
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 ions1,2,3 or trapped photons in cavity quantum-electrodynamical systems3,4. A third possibility that has been studied theoretically5,6 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.
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References
Sackett, C. A. et al. Experimental entanglement of four particles. Nature 404, 256–259 (2000).
Steane, A. et al. Speed of ion-trap quantum-information processors. Phys. Rev. A 62, 042305-1–042305-9 (2000).
Walther, H. Single atom experiments in cavities and trap. Proc. R. Soc. Lond. A 454, 431–445 (1998).
Rauschenbeutel, A. et al. Coherent operation of a tunable quantum phase gate in cavity QED. Phys. Rev. Lett. 83, 5166–5169 (1999).
Calarco, T., Briegel, H. J., Jaksch, D., Cirac, J. I. & Zoller, P. Entangling neutral atoms for quantum information processing. J. Mod. Opt. 47, 2137–2149 (2000).
Brennen, G. K., Deutsch, I. H. & Jessen, P. S. Entangling dipole-dipole interactions for quantum logic with neutral atoms. Phys. Rev. A 61, 062309-1–062309-10 (2000).
Morinaga, M., Bouchoule, I., Karam, J. C. & Salomon, C. Manipulation of motional quantum states of neutral atoms. Phys. Rev. Lett. 83, 4037–4040 (1999).
Doherty, A. C., Lynn, T. W., Hood, C. J. & Kimble, H. J. Trapping of single atoms with single photons in cavity QED. Phys. Rev. A 63, 013401-1–013401-24 (2001).
Pinkse, P. W. H., Fischer, T., Maunz, P. & Rempe, G. Trapping an atom with single photons. Nature 404, 365–368 (2000).
Hu, Z. & Kimble, H. J. Observation of a single atom in a magneto-optical trap. Opt. Lett. 19, 1888–1890 (1994).
Ruschewitz, F., Bettermann, D., Peng, J. L. & Ertmer, W. Statistical investigations on single trapped neutral atoms. Europhys. Lett. 34, 651–656 (1996).
Frese, D. et al. Single atoms in an optical dipole trap: towards a deterministic source of cold atoms. Phys. Rev. Lett. 85, 3777–3780 (2000).
Calarco, T. et al. Quantum gates with neutral atoms: Controlling collisional interactions in time-dependent traps. Phys. Rev. A 61, 022304-1–022304-11 (2000).
Brennen, G. K., Caves, C. M., Jessen, P. S. & Deutsch, I. H. Quantum logic gates in optical lattices. Phys. Rev. Lett. 82, 1060–1063 (1999).
DePue, M. T. et al. Unity occupation of sites in a 3D optical lattice. Phys. Rev. Lett. 82, 2262–2265 (1999).
Rempe, G. & Walther, H. Sub-Poissonian atomic statistics in a micromaser. Phys. Rev. A 42, 1650–1655 (1990).
Orzel, C., Tuchman, A. K., Fenselau, M. L., Yasuda, M. & Kasevich, M. A. Squeezed states in a Bose-Einstein condensate. Science 291, 2386–2389 (2001).
Gensemer, S. D., Gould, P. L., Leo, P. J., Tiesinga, E. & Williams, C. J. Ultracold 87Rb ground-state hyperfine-changing collisions in the presence and absence of laser light. Phys. Rev. A 62, 030702-1–030702-4 (2000).
Nesnidal, R. C. & Walker, T. G. Light-induced ultracold spin-exchange collisions. Phys. Rev. A 62, 030701-1–030701-4 (2000).
Kuppens, S. J. M., Corwin, K. L., Miller, K. W., Chupp, T. E. & Wieman, C. E. Loading an optical dipole trap. Phys. Rev. A 62, 013406-1–013406-13 (2000).
Jaksch, D. et al. Fast quantum gates for neutral atoms. Phys. Rev. Lett. 85, 2208–2211 (2000).
Miller, J. D., Cline, R. A. & Heinzen, D. J. Far-off-resonance optical trapping of atoms. Phys. Rev. A 47, R4567–R4570 (1993).
Acknowledgements
The contributions of K. Vigneron, H. Wilhelm and T. Zhang to early stages of the experiment are acknowledged. This work was supported by the European IST/FET programme ‘QUBITS’ and by the European IHP network ‘QUEST’.
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Schlosser, N., Reymond, G., Protsenko, I. et al. Sub-poissonian loading of single atoms in a microscopic dipole trap. Nature 411, 1024–1027 (2001). https://doi.org/10.1038/35082512
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DOI: https://doi.org/10.1038/35082512
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