Precision determination of the Cabibbo-Kobayashi-Maskawa element V(cb).
- A. Alberti, P. Gambino, K. J. Healey, S. Nandi
- PhysicsPhysical Review Letters
- 11 February 2015
We extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element V(c)} and the most relevant parameters of the heavy quark expansion from data of inclusive semileptonic B decays. Our…
Digital atom interferometer with single particle control on a discretized space-time geometry
- Andreas Steffen, A. Alberti, D. Meschede
- PhysicsProceedings of the National Academy of Sciences
- 4 June 2012
This work presents an atom interferometer operating with single trapped atoms, where single particle wave packets are controlled through spin-dependent potentials, yielding insight into decoherence mechanisms.
Ideal Negative Measurements in Quantum Walks Disprove Theories Based on Classical Trajectories
- C. Robens, W. Alt, D. Meschede, C. Emary, A. Alberti
- Physics
- 15 April 2014
We report on a stringent test of the nonclassicality of the motion of a massive quantum particle, which propagates on a discrete lattice. Measuring temporal correlations of the position of single…
Decoherence models for discrete-time quantum walks and their application to neutral atom experiments
- A. Alberti, W. Alt, R. Werner, D. Meschede
- Physics
- 22 September 2014
We discuss decoherence in discrete-time quantum walks in terms of a phenomenological model that distinguishes spin and spatial decoherence. We identify the dominating mechanisms that affect…
Electric quantum walks with individual atoms.
- M. Genske, W. Alt, A. Alberti
- PhysicsPhysical Review Letters
- 8 February 2013
The regime of strong fields is explored, demonstrating contrasting quantum behaviors: quantum resonances versus dynamical localization depending on whether the accumulated Bloch phase is a rational or irrational fraction of 2π.
Precision measurement of gravity with cold atoms in an optical lattice and comparison with a classical gravimeter.
- N. Poli, F. Wang, M. Tarallo, A. Alberti, M. Prevedelli, G. Tino
- PhysicsPhysical Review Letters
- 11 October 2010
A precision measurement of gravitational acceleration using ultracold strontium atoms confined in an amplitude-modulated vertical optical lattice is reported, consistent with the one measured with a classical gravimeter.
Engineering the quantum transport of atomic wavefunctions over macroscopic distances
- A. Alberti, V. V. Ivanov, G. Tino, G. Ferrari
- Physics
- 28 March 2008
How far can you stretch an atomic wavefunction? An experiment demonstrates that the wavefunction of an ensemble of ultracold atoms trapped in an optical lattice can be reversibly expanded and shrunk…
Molecular binding in interacting quantum walks
- A. Ahlbrecht, A. Alberti, D. Meschede, V. Scholz, A. H. Werner, R. Werner
- Physics
- 1 July 2012
We show that the presence of an interaction in the quantum walk of two atoms leads to the formation of a stable compound, a molecular state. The wave function of the molecule decays exponentially in…
Robustness of topologically protected edge states in quantum walk experiments with neutral atoms
- Thorsten Groh, S. Brakhane, W. Alt, D. Meschede, J. Asb'oth, A. Alberti
- Physics
- 11 May 2016
Discrete-time quantum walks allow Floquet topological insulator materials to be explored using controllable systems such as ultracold atoms in optical lattices. By numerical simulations, we study the…
Propagation of quantum walks in electric fields.
- C. Cedzich, T. Rybář, A. H. Werner, A. Alberti, M. Genske, R. Werner
- Physics, MathematicsPhysical Review Letters
- 14 October 2013
This work studies one-dimensional quantum walks in a homogenous electric field and relates the long time propagation properties of this system to the continued fraction expansion of the field.
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