Tommaso Calarco

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The creation and manipulation of many–particle entangled states offers new perspectives for the investigation of fundamental questions of quantum mechanics, and is the basis of applications such as quantum information processing. Several proposals to implement quantum logic [1] have been made including ion-traps [2], cavity QED and photons [3], and(More)
Alexey V. Gorshkov, Tommaso Calarco, Mikhail D. Lukin, and Anders S. Sørensen Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee, D-89081 Ulm, Germany QUANTOP, Danish National Research Foundation Center for Quantum Optics, Niels Bohr Institute,(More)
We investigate the optimal control of open quantum systems, in particular, the mutual influence of driving and dissipation. A stochastic approach to open-system control is developed, using a generalized version of Krotov's iterative algorithm, with no need for Markovian or rotating-wave approximations. The application to a harmonic degree of freedom reveals(More)
Atoms can be trapped and guided with electromagnetic fields, using nanofabricated structures. We describe the fundamental features of an interferometer for guided matter waves, built of two combined Y-shaped beam splitters. We find that such a device is expected to exhibit high contrast fringes even in a multimode regime, analogous to a white light(More)
The evolution of a two-level system subjected to stimulated transitions which is undergoing a sequence of measurements of the level occupation probability is evaluated. Its time correlation function is compared to the one obtained through the pure Schrödinger evolution. Systems of this kind have been recently proposed for testing the quantum mechanical(More)
We propose a two-qubit collisional phase gate that can be implemented with available atom chip technology, and present a detailed theoretical analysis of its performance. The gate is based on earlier phase gate schemes, but uses a qubit state pair with an experimentally demonstrated, very long coherence lifetime. Microwave near-fields play a key role in our(More)
Shmuel Fishman,1 Gabriele De Chiara,2,3 Tommaso Calarco,4 and Giovanna Morigi2 1Department of Physics, Technion, 32000 Haifa, Israel 2Grup d’Optica, Departament de Fisica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain 3BEC-CNR-INFM & Physics Department, University of Trento, Via Sommarive 14, I-38050 Povo (TN) Italy 4Institute for Quantum(More)
We consider a system composed of a trapped atom and a trapped ion. The ion charge induces in the atom an electric dipole moment, which attracts it with an r−4 dependence at large distances. In the regime considered here, the characteristic range of the atom-ion interaction is comparable or larger than the characteristic size of the trapping potential, which(More)