100 citations · 174 across the 5 of their papers we have counts for
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Decoherence of many-spin systems in NMR: From molecular characterization to an environmentally induced quantum dynamical phase transition
Gonzalo A. Alvarez
The control of open quantum systems has a fundamental relevance for fields ranging from quantum information processing to nanotechnology. Typically, the system whose coherent dynam…
Signatures of a quantum dynamical phase transition in a three-spin system in presence of a spin environment
Gonzalo A. Alvarez, Patricia R. Levstein, Horacio M. Pastawski
We have observed an environmentally induced quantum dynamical phase transition in the dynamics of a two spin experimental swapping gate [J. Chem. Phys. 124, 194507 (2006)]. There,…
Decoherence under many-body system-environment interactions: a stroboscopic representation based on a fictitiously homogenized interaction rate
Gonzalo A. Alvarez, Ernesto P. Danieli, Patricia R. Levstein +1
An environment interacting with portions of a system leads to multiexponential interaction rates. Within the Keldysh formalism, we fictitiously homogenize the system-environment in…
Quantum dynamical phase transition in a system with many-body interactions
Ernesto P. Danieli, Gonzalo A. Alvarez, Patricia R. Levstein +1
We introduce a microscopic Hamiltonian model of a two level system with many-body interactions with an environment whose excitation dynamics is fully solved within the Keldysh form…
Environmentally induced Quantum Dynamical Phase Transition in the spin swapping operation
Gonzalo Agustin Alvarez, Ernesto Pablo Danieli, Patricia Rebeca Levstein +1
Quantum Information Processing relies on coherent quantum dynamics for a precise control of its basic operations. A swapping gate in a two-spin system exchanges the degenerate stat…
Quantum dynamics under coherent and incoherent effects of a spin bath in the Keldysh formalism: application to a spin swapping operation
Ernesto P. Danieli, Horacio M. Pastawski, Gonzalo A. Alvarez
We develop the Keldysh formalism for the polarization dynamics of an open spin system. We apply it to the swapping between two qubit states in a model describing an NMR cross-polar…