[institut] Fwd: QTP seminar

[Mirzeta]

SEMINAR CENTRA ZA KVANTNU TEORIJSKU FIZIKU

Fizički amfiteatar
Sreda, 19. decembar 2018. godine u 11h

"Resource efficient entanglement detection"
Aleksandra Dimić, Fizički fakultet, Univerzitet u Beogradu

Quantum technologies lead to a variety of applications that outperform
their classical counterparts. In order to build a quantum device it must
be verified that it operates below some error threshold. Recently, because
of technological developments which allow for the experimental realization
of quantum states with increasing complexity, verification tasks must be
applied to large multi-qubit states. However, due to the
exponentially-increasing system size, tasks like quantum entanglement
verification become very hard to carry out in such cases. Here we develop
a generic framework to translate any entanglement witness into a
resource-eficient probabilistic scheme. We show that the confidence to
verify the presence of entanglement grows exponentially with the number of
individual detection events. To benchmark our findings, we experimentally
verify the entanglement of a photonic six-qubit cluster state generated
using three photon-pair sources operating at telecommunication wavelength.
We find that entanglement can be certified with at least 99:74% confidence
by detecting around 20 copies of the quantum state. Our protocol can be
carried out with a remarkably low number of copies, making it a practical
and applicable method to verify large-scale quantum devices.




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