Controlled collisions for multi-particle entanglement of optically trapped atoms

By O. Mandel, M. Greiner, A. Widera, T. Rom, T. Hänsch, I. Bloch. Nature, 2003

631 citations recorded by the source corpus.

Entanglement lies at the heart of quantum mechanics, and in recent years has been identified as an essential resource for quantum information processing and computation. The experimentally challenging production of highly entangled multi-particle states is therefore important for investigating both fundamental physics and practical applications. Here we report the creation of highly entangled states of neutral atoms trapped in the periodic potential of an optical lattice. Controlled collisions between individual neighbouring atoms are used to realize an array of quantum gates, with massively parallel operation. We observe a coherent entangling–disentangling evolution in the many-body system, depending on the phase shift acquired during the collision between neighbouring atoms. Such dynamics are indicative of highly entangled many-body states; moreover, these are formed in a single operational step, independent of the size of the system.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/c4b4208c3fa34581b819f41c9f14af4b48a58e31

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

High-resolution scanning electron microscopy of an ultracold quantum gas (2008, background): “Single-site addressability Ultracold quantum gases in optical lattice”
Entanglement temperature and entanglement entropy of excited states (2013, methodology): “To illustrate how to compute K and its entanglement entropy, we first review the case of a rotationally invariant QFT on R(2) with A the region A being the half line A = {x(1) > 0} [19].”
Simplifying quantum logic using higher-dimensional Hilbert spaces (2009, background): “Recently, much progress has been made with demonstrations of universal quantum gate sets in a number of physical architectures including ion traps 1,2 , linear optics 3–6 , superconductors 7,8 and atoms 9,10 .”
Measurement-based quantum computation (2009, background): “between neighbouring atoms across the array and create a cluster state across the whole lattic”
Cooling in strongly correlated optical lattices: prospects and challenges (2010, background): “The other state can then be removed from the lattice, or the two states decoupled via a Feshbach resonance or by shifting the lattice [152].”
Strongly interacting polaritons in coupled arrays of cavities (2006, background): “Even theoretical ideas for the implementation of quantum information processing have been pursued by entangling neighbouring atoms via controlled collision”
Quantum information with Rydberg atoms (2009, background): “Many particle entanglement mediated by collisional interactions has been observed in optical lattice based experiments(Anderlini et al., 2007; Mandel et al., 2003), but to date only the Rydberg interaction has been successfully applied to demonstration of a quantum gate between two neutral atoms.”
Physics with coherent matter waves (2004, background): “In addition the ultimate control over single atoms reached in the above experiment was further extended to different internal states with controllable interactions [332, 333] new interferometer schemes and multi-particle entanglement at will [322].”
Two-dimensional transport and transfer of a single atomic qubit in optical tweezers (2007, background): “This absence of motional heating is a crucial feature for entanglement schemes based on controlled collisions [16, 23] and results from the adiabaticity of the displacement.”