Zobrazeno 1 - 10
of 21
pro vyhledávání: '"S. P. Walborn"'
Publikováno v:
Quantum, Vol 8, p 1405 (2024)
We propose an estimation procedure for $d$-dimensional unitary transformations. For $d\gt2$, the unitary transformations close to the identity are estimated saturating the quantum Cramér-Rao bound. For $d=2$, the estimation of all unitary transforma
Externí odkaz:
https://doaj.org/article/04d3be80988642a39387559072993201
Publikováno v:
npj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
Abstract Fourth-order interference is an information processing primitive for photonic quantum technologies, as it forms the basis of photonic controlled-logic gates, entangling measurements, and can be used to produce quantum correlations. Here, usi
Externí odkaz:
https://doaj.org/article/e09d17baac474848bd740187a04ad2a4
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
Abstract Certification of quantum nonlocality plays a central role in practical applications like device-independent quantum cryptography and random number generation protocols. These applications entail the challenging problem of certifying quantum
Externí odkaz:
https://doaj.org/article/941e777889ae4ccb9499f26577204751
Publikováno v:
npj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
Abstract The celebrated Einstein–Podolsky–Rosen quantum steering has a complex structure in the multipartite scenario. We show that a naively defined criterion for multipartite steering allows, like in Bell nonlocality, for a contradictory effect
Externí odkaz:
https://doaj.org/article/facd8b1b447b4977ab819f3e9f48f7f1
Publikováno v:
Frontiers in Physics, Vol 9 (2021)
The capacity of optical communication channels can be increased by space division multiplexing in structured optical fibers. Radial core optical fibers allows for the propagation of twisted light–eigenmodes of orbital angular momentum, which have a
Externí odkaz:
https://doaj.org/article/ad242c3cb1e34871a27099919c40b067
Publikováno v:
Physical Review Research, Vol 2, Iss 3, p 033191 (2020)
We investigate interferometric techniques to estimate the deflection angle of an optical beam and compare them to the direct detection of the beam deflection. We show that quantum metrology methods lead to a unifying treatment for both single photons
Externí odkaz:
https://doaj.org/article/38c3ed126a154edba87526a2957d3793
Publikováno v:
Physical Review X, Vol 5, Iss 3, p 031042 (2015)
Multipartite entanglement is very poorly understood despite all the theoretical and experimental advances of the last decades. Preparation, manipulation, and identification of this resource is crucial for both practical and fundamental reasons. Howev
Externí odkaz:
https://doaj.org/article/a22435aebc074d649376bcf9b7028bcf
Autor:
G Cañas, E S Gómez, G H dos Santos, A G de Oliveira, N Rubiano da Silva, Stuti Joshi, Yaseera Ismail, P H S Ribeiro, S P Walborn
The twisted Gaussian Schell Model describes a family of partially coherent beams that present several interesting characteristics, and as such have attracted attention in classical and quantum optics. Recent techniques have been demonstrated to synth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27328023fc7332cbc90edafefce55529
http://arxiv.org/abs/2206.02693
http://arxiv.org/abs/2206.02693
Autor:
S. P. Walborn, K. Sawada
Publikováno v:
Journal of Optics. 20:075201
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac03c81ddccfb16aad272880db30c6b4
https://doi.org/10.1088/2040-8986/aac5c1
https://doi.org/10.1088/2040-8986/aac5c1
Autor:
C. H. Monken, S. P. Walborn
Publikováno v:
Physical Review A. 76
It is known that the entanglement present in the transverse spatial properties of photon pairs generated by spontaneous parametric down-conversion depends explicitly on the characteristics of the pump laser beam. Here we show that, for pump beams des
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7ef5572c320fbeb8c66787339a774f4
https://doi.org/10.1103/physreva.76.062305
https://doi.org/10.1103/physreva.76.062305