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9 papers · 2 filters
A new method to construct families of complex Hadamard matrices in even dimensions
D. Goyeneche
We present a new method for constructing affine families of complex Hadamard matrices in every even dimension. This method has an intersection with the Diţă construction and it gen…
Mutually unbiased triplets from non-affine families of complex Hadamard matrices in dimension six
D. Goyeneche
We study the problem of constructing mutually unbiased bases in dimension six. This approach is based on an efficient numerical method designed to find solutions to the quantum sta…
Polarization-stable long-distance interference of independent photons for quantum communications
T. Ferreira da Silva, D. Vitoreti, G. B. Xavier +2
Interference between fully-independent faint laser sources over two 8.5-km full polarization-controlled fiber links was performed, with stable visibility of 47.8%, an essential ste…
Real-time monitoring of single-photon detectors against eavesdropping in quantum key distribution systems
T. Ferreira da Silva, G. B. Xavier, G. P. Temporão +1
By employing real-time monitoring of single-photon avalanche photodiodes we demonstrate how two types of practical eavesdropping strategies, the after-gate and time-shift attacks,…
Real-time characterization of gated-mode single-photon detectors
T. Ferreira da Silva, G. B. Xavier, J. P. von der Weid
We propose a characterization method for the overall detection efficiency, afterpulse and dark count probabilities of single-photon counting modules in real-time with simple instru…
Quantum teleportation via maximum-confidence quantum measurements
L. Neves, M. A. Solís-Prosser, A. Delgado +1
We investigate the problem of teleporting unknown qudit states via pure quantum channels with nonmaximal Schmidt rank. This process is mapped to the problem of discriminating among…