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A quantum gas microscope for detecting single atoms in a Hubbard-regime optical lattice


Recent years have seen tremendous progress in creating complex atomic many-body quantum systems. One approach is to use macroscopic, effectively thermodynamic ensembles of ultracold atoms to create quantum gases and strongly correlated states of matter, and to analyse the bulk properties of the ensemble. For example, bosonic and fermionic atoms in a Hubbard-regime optical lattice1,2,3,4,5 can be used for quantum simulations of solid-state models6. The opposite approach is to build up microscopic quantum systems atom-by-atom, with complete control over all degrees of freedom7,8,9. The atoms or ions act as qubits and allow the realization of quantum gates, with the goal of creating highly controllable quantum information systems. Until now, the macroscopic and microscopic strategies have been fairly disconnected. Here we present a quantum gas ‘microscope’ that bridges the two approaches, realizing a system in which atoms of a macroscopic ensemble are detected individually and a complete set of degrees of freedom for each of them is determined through preparation and measurement. By implementing a high-resolution optical imaging system, single atoms are detected with near-unity fidelity on individual sites of a Hubbard-regime optical lattice. The lattice itself is generated by projecting a holographic mask through the imaging system. It has an arbitrary geometry, chosen to support both strong tunnel coupling between lattice sites and strong on-site confinement. Our approach can be used to directly detect strongly correlated states of matter; in the context of condensed matter simulation, this corresponds to the detection of individual electrons in the simulated crystal. Also, the quantum gas microscope may enable addressing and read-out of large-scale quantum information systems based on ultracold atoms.

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Figure 1: Diagram of the quantum gas microscope.
Figure 2: Imaging single atoms.
Figure 3: Site-resolved imaging of single atoms on a 640-nm-period optical lattice, loaded with a high density Bose–Einstein condensate.
Figure 4: Histogram showing the brightness distribution of lattice sites for an exposure time of 1 s.

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  1. Jaksch, D., Bruder, C., Cirac, J. I., Gardiner, C. W. & Zoller, P. Cold bosonic atoms in optical lattices. Phys. Rev. Lett. 81, 3108–3111 (1998)

    Article  ADS  CAS  Google Scholar 

  2. Greiner, M., Mandel, O., Esslinger, T., Hänsch, T. & Bloch, I. Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms. Nature 415, 39–44 (2002)

    Article  ADS  CAS  Google Scholar 

  3. Köhl, M., Moritz, H., Stöferle, T., Günter, K. & Esslinger, T. Fermionic atoms in a three dimensional optical lattice: observing Fermi surfaces, dynamics, and interactions. Phys. Rev. Lett. 94, 080403 (2005)

    Article  ADS  Google Scholar 

  4. Jördens, R., Strohmaier, N., Günter, K., Moritz, H. & Esslinger, T. A Mott insulator of fermionic atoms in an optical lattice. Nature 455, 204–207 (2008)

    Article  ADS  Google Scholar 

  5. Schneider, U. et al. Metallic and insulating phases of repulsively interacting fermions in a 3D optical lattice. Science 322, 1520–1525 (2008)

    Article  ADS  CAS  Google Scholar 

  6. Bloch, I., Dalibard, J. & Zwerger, W. Many-body physics with ultracold gases. Rev. Mod. Phys. 80, 885–964 (2008)

    Article  ADS  CAS  Google Scholar 

  7. Schrader, D. et al. Neutral atom quantum register. Phys. Rev. Lett. 93, 150501 (2004)

    Article  ADS  CAS  Google Scholar 

  8. Blatt, R. & Wineland, D. J. Entangled states of trapped atomic ions. Nature 453, 1008–1014 (2008)

    Article  ADS  CAS  Google Scholar 

  9. Urban, E. et al. Observation of Rydberg blockade between two atoms. Nature Phys. 5, 110–114 (2009)

    Article  ADS  CAS  Google Scholar 

  10. Jaksch, D. & Zwerger, W. The cold atom Hubbard toolbox. Ann. Phys. 315, 52–79 (2005)

    Article  ADS  CAS  Google Scholar 

  11. Duan, L.-M., Demler, E. & Lukin, M. D. Controlling spin exchange interactions of ultracold atoms in optical lattices. Phys. Rev. Lett. 91, 090402 (2003)

    Article  ADS  Google Scholar 

  12. Trotzky, S. et al. Time-resolved observation and control of superexchange interactions with ultracold atoms in optical lattices. Science 319, 295–299 (2008)

    Article  ADS  CAS  Google Scholar 

  13. Nelson, K., Li, X. & Weiss, D. Imaging single atoms in a three-dimensional array. Nature Phys. 3, 556–560 (2007)

    Article  ADS  CAS  Google Scholar 

  14. Karski, M. et al. Nearest-neighbor detection of atoms in a 1D optical lattice by fluorescence imaging. Phys. Rev. Lett. 102, 053001 (2009)

    Article  ADS  CAS  Google Scholar 

  15. Gericke, T., Würtz, P., Reitz, D., Langen, T. & Ott, H. High-resolution scanning electron microscopy of an ultracold quantum gas. Nature Phys. 4, 949–953 (2008)

    Article  ADS  CAS  Google Scholar 

  16. Itah, A. et al. Direct observation of number squeezing in an optical lattice. Preprint at 〈〉 (2009)

  17. Grier, D. G. A revolution in optical manipulation. Nature 424, 810–816 (2003)

    Article  ADS  CAS  Google Scholar 

  18. Newell, R., Sebby, J. & Walker, T. G. Dense atom clouds in a holographic atom trap. Opt. Lett. 28, 1266–1268 (2003)

    Article  ADS  CAS  Google Scholar 

  19. Bergamini, S. et al. Holographic generation of microtrap arrays for single atoms by use of a programmable phase modulator. J. Opt. Soc. Am. B 21, 1889–1894 (2004)

    Article  ADS  MathSciNet  CAS  Google Scholar 

  20. Brickman Soderberg, K., Gemelke, N. & Chin, C. Ultracold molecules: vehicles to scalable quantum information processing. N. J. Phys. 11, 055022 (2009)

    Article  Google Scholar 

  21. Gemelke, N., Zhang, X., Hung, C. & Chin, C. In situ observation of incompressible Mott-insulating domains in ultracold atomic gases. Nature 460, 995–998 (2009)

    Article  ADS  CAS  Google Scholar 

  22. Mansfield, S. M. & Kino, G. S. Solid immersion microscope. Appl. Phys. Lett. 57, 2615–2616 (1990)

    Article  ADS  CAS  Google Scholar 

  23. Gillen, J. I., Bakr, W. S., Peng, A., Unterwaditzer, P., Fölling, S. & Greiner, M. Two-dimensional quantum gas in a hybrid surface trap. Phys. Rev. A 80, 021602(R) (2009)

    Article  ADS  Google Scholar 

  24. Wineland, D. J., Dalibard, J. & Cohen-Tannoudji, C. Sisyphus cooling of a bound atom. J. Opt. Soc. Am. B 9, 32–42 (1992)

    Article  ADS  CAS  Google Scholar 

  25. Winoto, S. L., DePue, M., Bramall, N. E. & Weiss, D. S. Laser cooling at high density in deep far-detuned optical lattices. Phys. Rev. A 59, R19–R22 (1999)

    Article  ADS  CAS  Google Scholar 

  26. Würtz, P., Langen, T., Gericke, T., Koglbauer, A. & Ott, H. Experimental demonstration of single-site addressability in a two-dimensional optical lattice. Phys. Rev. Lett. 103, 080404 (2009)

    Article  ADS  Google Scholar 

  27. DePue, M. T., McCormick, C., Winoto, S. L., Oliver, S. & Weiss, D. S. Unity occupation of sites in a 3D optical lattice. Phys. Rev. Lett. 82, 2262–2265 (1999)

    Article  ADS  CAS  Google Scholar 

  28. Mandel, O. et al. Controlled collisions for multi-particle entanglement of optically trapped atoms. Nature 425, 937–940 (2003)

    Article  ADS  CAS  Google Scholar 

  29. Raussendorf, R. & Briegel, H. J. A one-way quantum computer. Phys. Rev. Lett. 86, 5188–5191 (2001)

    Article  ADS  CAS  Google Scholar 

  30. Bernier, J. et al. Cooling fermionic atoms in optical lattices by shaping the confinement. Phys. Rev. A 79, 061601 (2009)

    Article  ADS  Google Scholar 

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We are grateful for discussions with D. Weiss and V. Vuletic and thank P. Unterwaditzer, E. Su and J. Brachmann for experimental assistance during the early stage of the experiment. We thank D. Weiss for sharing the lens design of the objective lens. This work was funded by grants from the NSF, AFOSR MURI, DARPA, an Alfred P. Sloan Fellowship to M.G., and an NSF Fellowship to J.I.G.

Author Contributions All authors contributed to the design and building of the set-up and taking of the data. W.S.B. and S.F. analysed the data and W.S.B., S.F. and M.G. wrote the manuscript.

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Correspondence to Markus Greiner.

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Bakr, W., Gillen, J., Peng, A. et al. A quantum gas microscope for detecting single atoms in a Hubbard-regime optical lattice. Nature 462, 74–77 (2009).

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