



@article {1473,
	title = {Entangling two transportable neutral atoms via local spin exchange},
	journal = {Nature},
	volume = {527},
	year = {2015},
	month = {2015/11/02},
	pages = {208-211},
	abstract = {  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.
},
	doi = {10.1038/nature16073},
	url = {http://arxiv.org/abs/1507.05586},
	author = {A. M. Kaufman and B. J. Lester and Michael Foss-Feig and M. L. Wall and A. M. Rey and C. A. Regal}
}
@article {1477,
	title = {Hong-Ou-Mandel atom interferometry in tunnel-coupled optical tweezers},
	journal = {Science},
	volume = {345},
	year = {2014},
	month = {2014/06/26},
	pages = {306 - 309},
	abstract = {  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.
},
	doi = {10.1126/science.1250057},
	url = {http://arxiv.org/abs/1312.7182v2},
	author = {A. M. Kaufman and B. J. Lester and C. M. Reynolds and M. L. Wall and Michael Foss-Feig and K. R. A. Hazzard and A. M. Rey and C. A. Regal}
}
