%0 Journal Article %J Nature %D 2015 %T Entangling two transportable neutral atoms via local spin exchange %A A. M. Kaufman %A B. J. Lester %A Michael Foss-Feig %A M. L. Wall %A A. M. Rey %A C. A. Regal %X To advance quantum information science a constant pursuit is the search for physical systems that meet the stringent requirements for creating and preserving quantum entanglement. In atomic physics, robust two-qubit entanglement is typically achieved by strong, long-range interactions in the form of Coulomb interactions between ions or dipolar interactions between Rydberg atoms. While these interactions allow fast gates, atoms subject to these interactions must overcome the associated coupling to the environment and cross-talk among qubits. Local interactions, such as those requiring significant wavefunction overlap, can alleviate these detrimental effects yet present a new challenge: To distribute entanglement, qubits must be transported, merged for interaction, and then isolated for storage and subsequent operations. Here we show how, via a mobile optical tweezer, it is possible to prepare and locally entangle two ultracold neutral atoms, and then separate them while preserving their entanglement. While ultracold neutral atom experiments have measured dynamics consistent with spin entanglement, we are now able to demonstrate two-particle coherence via application of a local gradient and parity measurements; this new entanglement-verification protocol could be applied to arbitrary spin-entangled states of spatially-separated atoms. The local entangling operation is achieved via ultracold spin-exchange interactions, and quantum tunneling is used to combine and separate atoms. Our toolset provides a framework for dynamically entangling remote qubits via local operations within a large-scale quantum register. %B Nature %V 527 %P 208-211 %8 2015/11/02 %G eng %U http://arxiv.org/abs/1507.05586 %R 10.1038/nature16073 %0 Journal Article %J Science %D 2014 %T Hong-Ou-Mandel atom interferometry in tunnel-coupled optical tweezers %A A. M. Kaufman %A B. J. Lester %A C. M. Reynolds %A M. L. Wall %A Michael Foss-Feig %A K. R. A. Hazzard %A A. M. Rey %A C. A. Regal %X The quantum statistics of atoms is typically observed in the behavior of an ensemble via macroscopic observables. However, quantum statistics modifies the behavior of even two particles, inducing remarkable consequences that are at the heart of quantum science. Here we demonstrate near-complete control over all the internal and external degrees of freedom of two laser-cooled 87Rb atoms trapped in two optical tweezers. This full controllability allows us to implement a massive-particle analog of a Hong-Ou-Mandel interferometer where atom tunneling plays the role of a photon beamsplitter. We use the interferometer to probe the effect of quantum statistics on the two-atom dynamics under tunable initial conditions, chosen to adjust the degree of atomic indistinguishability. Our work thereby establishes laser-cooled atoms in optical tweezers as a new route to bottom-up engineering of scalable, low-entropy quantum systems. %B Science %V 345 %P 306 - 309 %8 2014/06/26 %G eng %U http://arxiv.org/abs/1312.7182v2 %N 6194 %! Science %R 10.1126/science.1250057