Finde die Arbeiten immer sehr interessant rund um Gerardo Adesso.
Accessible quantification of multiparticle entanglement
http://arxiv.org/pdf/1507.01600v2.pdf
The fascination with quantum entanglement has evolved over the last eight decades, from the realm of philosophical debate[1]toaveryconcreterecognitionofitsresourcerolein a range of applied sciences [2]. While considerable progress has been achieved in the detection of entanglement [3], its full quantification in general states is almost always unfeasible[4,5]. Quantifyingentanglementisyetnecessarytogauge precisely the quantum enhancement in information processingandcomputation[2],andtopindownexactlyhowmucha physical or biological system under observation departs from an essentially classical behaviour [6]. This is especially relevant in the case of complex, multiparticle systems, for which only quite recently have notable advances been reported both on the experimental control [7–10] as well as on the theoretical classification [11–16] and, in very few cases, quantification [17–23] of specific forms of entanglement.
An intuitive framework for classifying and quantifying the degree of multiparticle entanglement relies on a geometric perspective [24–26].
@Hawkwind
Ich finde solche Arbeiten einfach extrem wichtig, das ist wie mit diesen Ergebnissen hier: Genuine Quantum Coherence
http://arxiv.org/pdf/1511.08346v1.pdf
The basis of any quantum resource theory are free states and free operations, these are states and operations which can be created or performed at no cost. In the resource theory of quantum coherence free states are states which are diagonal in a fixed reference basis. This choice is natural in manyexperimentalscenarioswherethereferencebasisiss ingledoutbytheunavoidabledecoherence. The corresponding free operations are called incoherent, they can be implemented as a generalized measurement which does not create any coherence. However, a general quantum operation admits different experimental realizations, and a quantum operation which seems incoherent in one experimental realization might create coherence in another. Starting from this observation, we propose the framework of genuine quantum coherence. This approach is based on a simple principle:
we demand that a genuinely incoherent operation preservesall incoherent states. This simple condition automaticallyguaranteesthattheoperationisincoheren tregardlessoftheparticularexperimentalrealization. Amongotherresultsweintroduceandstudythetaskofincoh erentremotestatepreparation and compare our approach to the framework of quantum thermodynamics and the resource theory of asymmetry. Remarkably, we also show that the Hilbert-Schmidt distance to the set of incoherent states isa faithful measureof genuinecoherence.
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Das mag alles nicht "überraschen", ist aber IMHO trotzdem essenziell wichtig für die Forschung.
BTW: scheixx PDF