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Quantum coherence and quantum entanglement are two sides of the same coin
quantum coherence and quantum entanglement are two sides of the same coin
Quantum coherence and quantum entanglement are two landmark features of quantum physics, and now physicists have demonstrated that the two phenomena are "operationally equivalent"—that is, equivalent for all practical purposes, though still conceptually distinct. This finding allows physicists to apply decades of research on entanglement to the more fundamental but less-well-researched concept of coherence, offering the possibility of advancing a wide range of quantum technologies. Read more at: http://phys.org/news/2015-06-physici...sides.html#jCp |
#2
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
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#3
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Und was genau ist deine Botschaft?
__________________
Niels Bohr brainwashed a whole generation of theorists into thinking that the job (interpreting quantum theory) was done 50 years ago. |
#4
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Frage ich mich auch: dass ein enger Zusammenhang besteht zwischen Verschränkung und Quantenkohärenz sollte m.E. auch nicht so sehr überraschen.
Hat die Forscher auch nicht überrascht - die wissenschaftliche Publikation dazu: "Measuring Quantum Coherence with Entanglement" http://arxiv.org/abs/1502.05876 Sie scheinen Verschränkung zu nutzen, um den Grad der Kohärenz zu messen. Ge?ndert von Hawkwind (09.12.15 um 12:22 Uhr) |
#5
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
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. ---- Das mag alles nicht "überraschen", ist aber IMHO trotzdem essenziell wichtig für die Forschung. BTW: scheixx PDF |
#6
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Summary
Discord can be quantified by the minimum entanglement created with an apparatus during a premeasurement Coherence can be quantified by the maximum entanglement created by incoherent operations --- Discord can be interpreted and quantified in terms of bipartite coherence minimized over all local bases for subsystem Knack und back. Gruß |
#7
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Könntest du in Zukunft bitte wenigstens irgendeine Aussage mit deinen Botschaften verbinden, nicht nur dass die Links wichtig sind. Es fällt mir sonst schwer, deine Posts als Diskussionsbeitrag einzuordnen.
-Ich- |
#8
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Das soll wirklich keine Werbung sein! Aber der Typ macht einfach Hammer-Präsentationen.
http://quantumcorrelations.weebly.co...tanglement.pdf Gerardo Adesso School of Mathematical Sciences, The University of Nottingham Accessible quantification of multiparticle entanglement Und so wie ich das beurteile, basieren seine Arbeiten mehr oder weniger alle auf den Erkenntnissen aus dem Eingangspost. (Coherence=maximum entanglement "with" incoherent ancilla; Discord=bipartite coherence minimized over all local bases for subsystem) Deshalb mal kein neuer FRED. Only for INFO BTW: Ich sehe gerade mein 'Freiheitsgrad 11:21 Tag', neigt sich dem Ende zu. |
#9
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Jaja super: besonders die Abschnitte über die M3N- und GHZ-States, die man ja über die LOCC-Operationen erhält, aber auch die verallgemeinerten Smolin-States:
Zitat:
Ich freu mich auch immer, wenn ich nix verstehe; dann muss der Artikel sicher gut sein. |
#10
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AW: Quantum coherence and quantum entanglement are two sides of the same coin
Das ist schon bemerkenswert, wie jemand, der aber auch wirklich nichts von dem versteht, was er da verlinkt, trotzdem so überzeugt davon sein kann.
Thema wird geschlossen. Ge?ndert von Marco Polo (15.01.16 um 22:16 Uhr) |
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