Thread by @fgrosshans

Now at #QICA, Damian Markham from @ScienceSorbonne presents an Introduction to Quantum Networks
#LTQI

@ScienceSorbonne Damian Markham’s talk is actually steamed here facebook.com/watchparty/624…

Damian Markham recalls the advantages we expect from quantum information, in computation, simulation, communication, and sensing. #LTQI

Damian Markham:
What you should understand about quantum information
1. It is not weird or magic
2. It is beautiful
3. It si not all about quantum computer or quantum key distribution
#WordsOfWisdom
#LTQI #QICA

Damian Markham goes through the weird^H^H^H^H^Hbeautiful properties of polarized photons, Einstein-Podolsky-Rosen paradox. Quantum randomnes is not just an ignorance of the state of my system.
#QICA #LTQI

Damian introduces the Peres–Mermin square. Assign ±1 value s.t. rows and columns product are:
? ? ? → +1
? ? ? → +1
? ? ? → –1
↓ ↓ ↓
+ + +

It’s classically impossible, quantumly possible w/ thesemeasurements

X⊗I I⊗Z X⊗Z
I⊗X Z⊗I Z⊗X
X⊗X Z⊗Z Y⊗Y

#LTQI #QICA

Damian Markham: This feature can be leveraged to give provable computable advantage. It is behind all quantum speedup ?
It’s also a great resource for quantum communication, delegated computing, etc.
#LTQI

Damian Markham looks at the resource needed for delegated verified computation. A very weak client wants to use a powerful untrusted server.
Quantum resource are essentially Entanglement, Steering, and Bell Non-locality, in decreasing “trust” order, and “ease” order #LTQI #QICA

Damian Markham:
• Entanglement: measurement devices trusted
• Steering : One measurement device is trusted, not the other
• Non-locality : nothing at all is known about what the devices are doing
#LTQI #QICA

Damian Markham: What are the resource needed for delegated verified computation ? [RUV‘13] uses non-locality
Steering is enough arXiv:1608.09012 arxiv.org/abs/1608.09012 PRA 95 052324 dx.doi.org/10.1103/PhysRe…
#LTQI #QICA
This very fundamental paper was the seed to applications

Damian Markham: Another question is how to route these different resource across quantum networks.
#LTQI #QICA

Damian Markham: Everything is connected. Foundational questions help us to design applications, which in turn give us new insight into physics itself. #LTQI #QICA