Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Cañas, G."'
Autor:
de Oliveira, M. Gil, Junior, A. L. S. Santos, Barbosa, A. C., da Silva, B. Pinheiro, Santos, G. H. dos, Cañas, G., Ribeiro, P. H. Souto, Walborn, S. P., Khoury, A. Z.
We investigate theoretically and experimentally the optical second harmonic generation (SHG) with a twisted Gaussian Schell model (TGSM) beam as the fundamental field. We use Type-II phase matching and analyze the cross spectral density (CSD) of the
Externí odkaz:
http://arxiv.org/abs/2403.04040
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 at
Externí odkaz:
http://arxiv.org/abs/2109.03064
The accuracy of estimating $d$-dimensional quantum states is limited by the Gill-Massar bound. It can be saturated in the qubit ($d=2$) scenario using adaptive standard quantum tomography. In higher dimensions, however, this is not the case and the a
Externí odkaz:
http://arxiv.org/abs/2009.04791
We introduce a new method to estimate unknown pure $d$-dimensional quantum states using the probability distributions associated with only three measurement bases. Measurement results of $2d$ projectors are employed to generate a set of $2^{d-1}$ pos
Externí odkaz:
http://arxiv.org/abs/2006.03219
Autor:
Cariñe, J., Cañas, G., Skrzypczyk, P., Šupić, I., Guerrero, N., Garcia, T., Pereira, L., Prosser, M. A. S., Xavier, G. B., Delgado, A., Walborn, S. P., Cavalcanti, D., Lima, G.
Publikováno v:
Optica Vol. 7, Issue 5, pp. 542-550 (2020)
Multi-port beamsplitters are cornerstone devices for high-dimensional quantum information tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such devices has been proven to be challenging with progress only recently
Externí odkaz:
http://arxiv.org/abs/2001.11056
Publikováno v:
Phys. Rev. A 99, 012336 (2019)
High-dimensional quantum information processing has become a mature field of research with several different approaches being adopted for the encoding of $D$-dimensional quantum systems. Such progress has fueled the search of reliable quantum tomogra
Externí odkaz:
http://arxiv.org/abs/1808.07148
Autor:
Cañas, G., Vera, N., Cariñe, J., González, P., Cardenas, J., Connolly, P. W. R., Przysiezna, A., Gómez, E. S., Figueroa, M., Vallone, G., Villoresi, P., da Silva, T. Ferreira, Xavier, G. B., Lima, G.
Publikováno v:
Phys. Rev. A 96, 022317 (2017)
Multiplexing is a strategy to augment the transmission capacity of a communication system. It consists of combining multiple signals over the same data channel and it has been very successful in classical communications. However, the use of enhanced
Externí odkaz:
http://arxiv.org/abs/1610.01682
Publikováno v:
Physical Review A 91, 013801 (2015)
Due to practical reasons, experimental and theoretical continuous-variable (CV) quantum information (QI) has been heavily based on Gaussian states. Nevertheless, many CV-QI protocols require the use of non-Gaussian states and operations. Here, we sho
Externí odkaz:
http://arxiv.org/abs/1501.02403
Publikováno v:
Phys. Rev. Lett. 115, 090401 (2015)
A long standing problem in quantum mechanics is the minimum number of observables required for the characterisation of unknown pure quantum states. The solution to this problem is specially important for the developing field of high-dimensional quant
Externí odkaz:
http://arxiv.org/abs/1411.2789
Autor:
Etcheverry, S., Cañas, G., Gómez, E. S., Nogueira, W. A. T., Saavedra, C., Xavier, G. B., Lima, G.
Publikováno v:
Sci. Rep. 3, 2316 (2013)
The secure transfer of information is an important problem in modern telecommunications. Quantum key distribution (QKD) provides a solution to this problem by using individual quantum systems to generate correlated bits between remote parties, that c
Externí odkaz:
http://arxiv.org/abs/1308.0019