The entangling power of a "glocal" dissipative map

We consider a model of two qubits dissipating into both local and global environments (generally at non-zero temperatures), with the possibility of interpolating between purely local dissipation and purely global one. The corresponding dissipative dynamical map is characterized in terms of its Kraus operators focusing on the stationary regime. We then determine conditions under which entanglement can be induced by the action of such a map. It results (rather counterintuitively) that in order to have entanglement in the presence of local environment, this latter must be at nonzero temperature.Comment: 13 pages, 6 figure

The Volume of Two-Qubit States by Information Geometry

Using the information geometry approach, we determine the volume of the set of two-qubit states with maximally disordered subsystems. Particular attention is devoted to the behavior of the volume of sub-manifolds of separable and entangled states with fixed purity. We show that the usage of the classical Fisher metric on phase space probability representation of quantum states gives the same qualitative results with respect to different versions of the quantum Fisher metric

New Trends in Statistical Physics of Complex Systems

A topical research activity in statistical physics concerns the study of complex and disordered systems. Generally, these systems are characterized by an elevated level of interconnection and interaction between the parts so that they give rise to a rich structure in the phase space that self-organizes under the control of internal non-linear dynamics. These emergent collective dynamics confer new behaviours to the whole system that are no longer the direct consequence of the properties of the single parts, but rather characterize the whole system as a new entity with its own features, giving rise to the birth of new phenomenologies. As is highlighted in this collection of papers, the methodologies of statistical physics have become very promising in understanding these new phenomena. This volume groups together 12 research works showing the use of typical tools developed within the framework of statistical mechanics, in non-linear kinetic and information geometry, to investigate emerging features in complex physical and physical-like systems. A topical research activity in statistical physics concerns the study of complex and disordered systems. Generally, these systems are characterized by an elevated level of interconnection and interaction between the parts so that they give rise to a rich structure in the phase space that self-organizes under the control of internal non-linear dynamics. These emergent collective dynamics confer new behaviours to the whole system that are no longer the direct consequence of the properties of the single parts, but rather characterize the whole system as a new entity with its own features, giving rise to the birth of new phenomenologies. As is highlighted in this collection of papers, the methodologies of statistical physics have become very promising in understanding these new phenomena. This volume groups together 12 research works showing the use of typical tools developed within the framework of statistical mechanics, in non-linear kinetic and information geometry, to investigate emerging features in complex physical and physical-like systems

Parsing Technology-entanglement for Thick-things: The Complication or Complexity of Media and Technologies

Can an interpretive framework untangle distributed forms of technology-enabled media? The thesis develops an interpretive framework to provide an antidote to reckless imaginations that privilege concealment and encourage explanations of technology-enablement as social or automagical. The framework is a response to Latour's call to modify explanations given simply as 'social' and Kittler's observation of software as an unrecognizable layering of linguistic extensions. The interpretive framework is developed from successive encounters with technology-enablement associated with a particular geospatial use of Augmented Reality. Augmented Reality that accesses photos embedded with geospatial information depends on multiple distributed technologies ranging from smartphones to satellites. This contemporary form of technology-enabled media is demonstrated by a Panoramio geospatial layer of tourist photos accessed using the software product Layar. The encounters are with an image collection, WIFI router, 3G cellular data network, iPhone, geospatial location service and Layar. These enabling technologies have been gathered and inspected for human and nonhuman agencies during project encounters that followed an ethnographic approach. A dialogue with technology practitioners informs the analytical engagement with Augmented Reality to provide an alternative vocabulary for theoretical access to those vastly distributed and indescribable technology-enablers. The framework is developed through successive propositions. The encounters pursue the trajectory of a digital image from a technology-enabled visual representation that can be created or consumed with ease to distributed image collections that operate as a contemporary site of interoperability. Photos are transformed in proposition 1 from a visual surface to a realm of specificity that is a stratified and expansive construction of exchangeable data. The second proposition establishes technologies as constructed from atomic building blocks that are combined in either complicated or complex formations. The second proposition asserts that it is necessary to distinguish between complication and complexity. Propositions 1 and 2 are extended by a debate between respective positions of an extremely flat ontology and an expansive materialism represented by Bryant, Barad, Latour and Bennett. The flat ontology is rejected and a thick account of things is asserted as a position that better accounts for the entanglement of humans and nonhumans interoperating amongst a synthetic ecology of media technologies. The third proposition is that the technology-enablement of media is a complicated or complex form of technology-entanglement. The thesis demonstrates this interpretive framework before concluding with a ‘how-to’ that guides researchers adapting this methodology for their own projects

Knowledge and Management Models for Sustainable Growth

In the last years sustainability has become a topic of global concern and a key issue in the strategic agenda of both business organizations and public authorities and organisations. Significant changes in business landscape, the emergence of new technology, including social media, the pressure of new social concerns, have called into question established conceptualizations of competitiveness, wealth creation and growth. New and unaddressed set of issues regarding how private and public organisations manage and invest their resources to create sustainable value have brought to light. In particular the increasing focus on environmental and social themes has suggested new dimensions to be taken into account in the value creation dynamics, both at organisations and communities level. For companies the need of integrating corporate social and environmental responsibility issues into strategy and daily business operations, pose profound challenges, which, in turn, involve numerous processes and complex decisions influenced by many stakeholders. Facing these challenges calls for the creation, use and exploitation of new knowledge as well as the development of proper management models, approaches and tools aimed to contribute to the development and realization of environmentally and socially sustainable business strategies and practices

The entangling power of a "glocal" dissipative map

We consider a model of two qubits dissipating into both local and global environments (generally at non-zero temperatures), with the possibility of interpolating between purely local dissipation and purely global one. The corresponding dissipative dynamical map is characterized in terms of its Kraus operators focusing on the stationary regime. We then determine conditions under which entanglement can be induced by the action of such a map. It results (rather counterintuitively) that in order to have entanglement in the presence of local environment, this latter must be at nonzero temperature