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5 papers · 2 filters
Tunnelling times: An elementary introduction
G. Privitera, G. Salesi, V. S. Olkhovsky +1
In this paper we examine critically and in detail some existing definitions for the tunnelling times, namely: the phase-time; the centroid-based times; the Buttiker and Landauer ti…
Entanglement and factorized ground states in two-dimensional quantum antiferromagnets
Tommaso Roscilde, Paola Verrucchi, Andrea Fubini +2
Making use of exact results and quantum Monte Carlo data for the entanglement of formation, we show that the ground state of anisotropic two-dimensional S=1/2 antiferromagnets in a…
Quantum state transfer in imperfect artificial spin networks
M. Paternostro, G. M. Palma, M. S. Kim +1
High-fidelity quantum computation and quantum state transfer are possible in short spin chains. We exploit a system based on a dispersive qubit-boson interaction to mimic XY coupli…
Quantum theory of a polarization phase-gate in an atomic tripod configuration
S. Rebic, D. Vitali, C. Ottaviani +4
We present the quantum theory of a polarization phase-gate that can be realized in a sample of ultracold rubidium atoms driven into a tripod configuration. The main advantages of t…
Dynamical entanglement-transfer for quantum information networks
M. Paternostro, W. Son, M. S. Kim +2
A key element in the architecture of a quantum information processing network is a reliable physical interface between fields and qubits. We study a process of entanglement transfe…