QuCSI

Computer simulation of observable phenomena is an indispensable tool for engineering new technology, understanding the natural world, and studying human society. Yet the most interesting systems are often complex, such that simulating their future behaviour demands storing immense amounts of information regarding how they have behaved in the past. For increasingly complex systems, simulation becomes ... Read moreExperimental quantum processing enhancement in modelling stochastic processes (New Preprint)

We understand all natural things around us by their input-response behavior, for example we perceive neurological networks as transducing sensory inputs to electrical impulses known as spike trains, meanwhile photosynthesis is a mechanism for converting electro-magnetic energy to chemical energy. In this preprint, we ask whether our understanding of such phenomena depend on the information theory ... Read moreUsing quantum theory to reduce the complexity of input-output processes (New Preprint)

Can quantum information fundamentally change the way we perceive what is complex? In our latest preprint, we generalized a widely-used measure of complexity – the statistical complexity – to the quantum regime. Statistical complexity quantifies the minimal classical information we must store about a process to simulate its future behaviour. We construct a quantum variant ... Read moreThe classical-quantum divergence of complexity in the Ising spin chain (New Preprint)

Recent results in quantum information theory characterize quantum coherence in the context of resource theories. Here, we study the relation between quantum coherence and quantum discord, a kind of quantum correlation which appears even in non-entangled states. We prove that the creation of quantum discord with multipartite incoherent operations is bounded by the amount of quantum coherence ... Read moreConverting Coherence to Quantum Correlations (New Preprint)

At the heart of complexity and complex systems is the manipulation of patterns – predictable structures – using an internal memory, but the exact structure of this memory is not uniquely defined. Here, we consider the thermodynamics involved in this manipulation, such as by living things which exploit patterns in their surroundings, and use the ... Read moreWhen is simpler thermodynamically better? (New preprint)