Preparation of a single atom in an optical microtrap

We investigate the use of light assisted collisions for the deterministic preparation of individual atoms in a microtrap. Blue detuned light is used in order to ensure that only one of the collision partners is lost from the trap. We obtain a 91% loading efficiency of single 85Rb atoms. This can be achieved within a total preparation time of 542 ms. A numerical model of the process quantitatively agrees with the experiment giving an in-depth understanding of the dynamics of the process and allowing us to identify the factors that still limit the loading efficiency. The fast loading time in combination with the high efficiency may be sufficient for loading quantum registers at the size required for competitive quantum computing.

[1]  William D. Phillips,et al.  Controlled exchange interaction between pairs of neutral atoms in an optical lattice , 2007, Nature.

[2]  Ken'ichi Nakagawa,et al.  Single atom Rydberg excitation in a small dipole trap. , 2009, Optics express.

[3]  Igor Protsenko,et al.  Sub-poissonian loading of single atoms in a microscopic dipole trap , 2001, Nature.

[4]  R. Blatt,et al.  Quantum simulations with trapped ions , 2011, Nature Physics.

[5]  Thomas G. Walker,et al.  Deterministic entanglement of two neutral atoms via Rydberg blockade , 2010, 1007.0397.

[6]  W. Alt,et al.  Erratum: Single atoms in a standing-wave dipole trap [Phys. Rev. A 67 , 033403 (2003)] , 2005 .

[7]  A. Lance,et al.  Imaging a single atom in a time-of-flight experiment , 2010, 1002.2311.

[8]  Lukin,et al.  Fast quantum gates for neutral atoms , 2000, Physical review letters.

[9]  W. Alt,et al.  Single atoms in a standing-wave dipole trap , 2002, quant-ph/0211066.

[10]  Immanuel Bloch,et al.  Single-spin addressing in an atomic Mott insulator , 2011, Nature.

[11]  Christian Nölleke,et al.  Ground-state cooling of a single atom at the center of an optical cavity. , 2012, Physical review letters.

[12]  Harold Metcalf,et al.  Laser Cooling and Trapping , 1999, Peking University-World Scientific Advanced Physics Series.

[13]  Dieter Meschede,et al.  Cold collisions in a high-gradient magneto-optical trap , 2002 .

[14]  R. Feynman.  Simulating physics with computers , 1999 .

[15]  C. Regal,et al.  Cooling a Single Atom in an Optical Tweezer to Its Quantum Ground State , 2012, 1209.2087.

[16]  S. Stenholm,et al.  Laser cooling and trapping , 1988 .

[17]  A. Browaeys,et al.  Light-assisted collisions between a few cold atoms in a microscopic dipole trap , 2011, 1107.5781.

[18]  M. Greiner,et al.  Probing the Superfluid–to–Mott Insulator Transition at the Single-Atom Level , 2010, Science.

[19]  D. B. Tretyakov,et al.  Deterministic single-atom excitation via adiabatic passage and Rydberg blockade , 2011, 1102.5223.

[20]  J D Thompson,et al.  Coherence and Raman sideband cooling of a single atom in an optical tweezer. , 2012, Physical review letters.

[21]  M. Head‐Gordon,et al.  Simulated Quantum Computation of Molecular Energies , 2005, Science.

[22]  M. McGovern,et al.  Near-deterministic preparation of a single atom in an optical microtrap , 2010 .

[23]  P Grangier,et al.  Entanglement of two individual neutral atoms using Rydberg blockade. , 2009, Physical review letters.

[24]  Yang Wang,et al.  3D projection sideband cooling. , 2012, Physical review letters.

[25]  D. Weiss,et al.  Imaging single atoms in a three dimensional array , 2007 .

[26]  P. S. Jessen,et al.  Quantum Information Processing with Trapped Neutral Atoms , 2004, Quantum Inf. Process..

[27]  D. Weiss,et al.  Unity Occupation of Sites in a 3D Optical Lattice , 1999 .

[28]  David J. Wineland,et al.  Quantum information processing and metrology with trapped ions , 2011 .

[29]  S. Jochim,et al.  Deterministic Preparation of a Tunable Few-Fermion System , 2011, Science.

[30]  Dieter Meschede,et al.  Quantum engineering: An atom-sorting machine , 2006, Nature.

[31]  T. Grünzweig,et al.  Counting atoms in a deep optical microtrap. , 2010, Optics letters.

[32]  J. Weiner.  Cold and Ultracold Collisions in Quantum Microscopic and Mesoscopic Systems , 2004 .

[33]  Thomas G. Walker,et al.  Demonstration of a neutral atom controlled-NOT quantum gate. , 2009, Physical review letters.