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Lastra F.,University of Antofagasta | Lopez C.E.,University of Santiago de Chile | Lopez C.E.,Center for the Development of Nanoscience and Nanotechnology | Reyes S.A.,University of Santiago de Chile | Wallentowitz S.,University of Santiago de Chile
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2014

We investigate the dynamics of classical and quantum correlations between two qubits. Each qubit is implemented by a pair of phosphorous impurities embedded in a silicon substrate. The main decoherence mechanism affecting these types of qubits is provided by the coupling of the phosphorous impurities to the acoustical vibrations of the silicon lattice. We find that depending on the temperature of the substrate and the initial state, three different dynamics can be found. These are characterized by the number of abrupt changes in both classical and quantum correlations. We also show that the correlations do not disappear. Moreover, before the classical correlations reach a constant value, they may experience successive abrupt changes associated with the apparition of a metastable pointer-states basis. Then a constant value for the classical correlations is reached when the preferred basis is established. © 2014 American Physical Society. Source


Lastra F.,University of Santiago de Chile | Romero G.,University of the Basque Country | Lopez C.E.,University of Santiago de Chile | Lopez C.E.,Center for the Development of Nanoscience and Nanotechnology | And 3 more authors.
Optics Communications | Year: 2010

We study the evolution of entangled coherent states of the two quantized electromagnetic fields under dissipation. Characteristic time scales for the decay of the negativity are found in the case of large values of the phase space distance among the states of each mode. We also study how the entanglement emerges among the reservoirs. © 2010 Elsevier B.V. All rights reserved. Source


Lopez C.E.,University of Santiago de Chile | Lopez C.E.,Center for the Development of Nanoscience and Nanotechnology | Romero G.,University of the Basque Country | Retamal J.C.,University of Santiago de Chile | Retamal J.C.,Center for the Development of Nanoscience and Nanotechnology
Optics InfoBase Conference Papers | Year: 2011

We study the dynamics of entanglement transfer in a system composed of two initially correlated three-level atoms, each located in a cavity interacting with its own reservoir. Instead of using the usual master equation approach, we consider the dynamics of the reservoir. In this situation, we show that the entanglement is completely transferred from atoms to reservoirs. Although the cavities mediate this entanglement transfer, we show that under certain conditions, no entanglement is found in cavities throughout the dynamics. Considering the entanglement dynamics of interacting and non-interacting bipartite partitions, we found time windows where the entanglement can only flow through interacting partitions, depending on the system parameters. © 2011 Optical Society of America. Source


Lopez C.E.,University of Santiago de Chile | Lopez C.E.,Center for the Development of Nanoscience and Nanotechnology | Romero G.,University of Santiago de Chile | Romero G.,University of the Basque Country | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2010

We study the dynamics of entanglement transfer in a system composed of two initially correlated three-level atoms, each located in a cavity interacting with its own reservoir. Instead of tracing out reservoir modes to describe the dynamics using the master equation approach, we consider explicitly the dynamics of the reservoirs. In this situation, we show that the entanglement is completely transferred from atoms to reservoirs. Although the cavities mediate this entanglement transfer, we show that under certain conditions, no entanglement is found in cavities throughout the dynamics. Considering the entanglement dynamics of interacting and noninteracting bipartite subsystems, we found time windows where the entanglement can only flow through interacting subsystems, depending on the system parameters. © 2010 The American Physical Society. Source


Lamata L.,University of the Basque Country | Lopez C.E.,University of Santiago de Chile | Lopez C.E.,Center for the Development of Nanoscience and Nanotechnology | Lanyon B.P.,Institute For Quantenoptik Und Quanteninformation | And 5 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We propose a method to generate arbitrary symmetric states of N qubits, which can be easily associated with their entanglement classes. It is particularly suited to quantum optics systems like trapped ions or superconducting circuits. We encode each qubit in two metastable levels of the system and use a bosonic quantum bus for creating the states. The method is deterministic and relies on a sequence of selective unitary gates upon the qubits within the system coherence time. © 2013 American Physical Society. Source

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