Fast, high fidelity information transmission through spin chain quantum wires

Spin chains have been proposed as quantum wires for information transfer in solid state quantum architectures. We show that huge gains in both transfer speed and fidelity are possible using a minimalist control approach that relies only a single, local, on-off switch actuator. Effective switching time sequences can be determined using optimization techniques for both ideal and disordered chains. Simulations suggest that effective optimization is possible even in the absence of accurate models.Comment: revtex4, 4 pages, 5 figure

Statecraft, scalecraft and local government reorganisation in Wales

Since the inception of local government in the UK, there have been continuous attempts to reorganise and revise its distinctive characteristics, with successive reforms differing in their intended effects. In Wales, a further round of local government reorganisation is now being proposed following the Williams Commission Report (2014) on Public Service Governance and Delivery. Through drawing on the concepts of statecraft and scalecraft, this paper provides a theoretically informative account of the contradictions of the ‘layering’ process associated with the rescaling of local government in Wales. This helps to (i) enhance our understanding of contemporary proposals for reform; and (ii) develop a tighter specifying of the process of state rescaling

Urban planning and the challenge of super-diversity

Little attention to date has focused on the role of urban planning in responding to migration-related super-diversity. Through a focus on a city (Liverpool, UK) which is becoming increasingly super-diverse, the paper highlights the importance of class based differences – over and above ethnic and cultural differences – in shaping the practices of urban planners. Along with the recency and speed of population change, the importance of legal status and the 'visibility' of super-diversity, this may serve to increase the risk of urban planning equivalising differences between residents and concealing issues of racism and discrimination

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XML Interfaces to the Internet of Things

The internet of things is predicated on tiny, cheap, lower power computers being embedded in devices everywhere. However such tiny devices by definition have very little memory and computing power available to support user interfaces or extended servers, and so the user interface needs to be distributed over the network. This paper describes techniques using standard technologies based on XML for creating remote user interfaces for the Internet of Thing