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

;)

AW: Quantum coherence and quantum entanglement are two sides of the same coin
 

http://quantumcorrelations.weebly.co...ations_cde.pdf
Das sollte hier unbedingt verlinkt sein.
Gruß

AW: Quantum coherence and quantum entanglement are two sides of the same coin
 

Und was genau ist deine Botschaft?

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.

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

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 ;)

AW: Quantum coherence and quantum entanglement are two sides of the same coin
 

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.
:p

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:

Einfach phantastisch ... .

Ich freu mich auch immer, wenn ich nix verstehe; dann muss der Artikel sicher gut sein.

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.