49 citations · 194 across the 18 of their papers we have counts for
20 papers
Demonstration of an LLO CV-QKD system over 12 km of optical fiber
Christiano M. S. Nascimento, Artur A. Matoso, Gustavo C. Amaral +1
Continuous-variable quantum key distribution (CV-QKD) promises high rates and seamless integration with classical beams within a single optical fiber. Over the years, implementatio…
Swap Test-based Characterization of Quantum Processes in Universal Quantum Computers
Pedro Ripper, Gustavo Amaral, Guilherme Temporão
Quantum Computing has been presenting major developments in the last few years, unveiling systems with a increasing number of qubits. However, unreliable quantum processes in unive…
Towards a spectrally multiplexed quantum repeater
Tanmoy Chakraborty, Antariksha Das, Hedser van Brug +5
Extended quantum networks are based on quantum repeaters that often rely on the distribution of entanglement in an efficient and heralded fashion over multiple network nodes. Many…
Spectrally Multiplexed Hong-Ou-Mandel Interference
Oriol Pietx-Casas, Gustavo Castro do Amaral, Tanmoy Chakraborty +4
We explore the suitability of a Virtually-Imaged Phased Array (VIPA) as a Spectral-to-Spatial Mode-Mapper (SSMM) for applications in quantum communication such as a quantum repeate…
A Fiber Measurement System with Approximate Deconvolution Based on the Analysis of Fault Clusters in Linearized Bregman Iterations
Yuneisy Garcia Guzman, Felipe Calliari, Gustavo C. Amaral +1
Automatic detection of faults in optical fibers is an active area of research that plays a significant role in the design of reliable and stable optical networks. A fiber measureme…
A long-lived solid-state optical quantum memory for high-rate quantum repeaters
Mohsen Falamarzi Askarani, Antariksha Das, Jacob H. Davidson +8
We argue that long optical storage times are required to establish entanglement at high rates over large distances using memory-based quantum repeaters. Triggered by this conclusio…
Entanglement and non-locality between disparate solid-state quantum memories mediated by photons
Marcel. li Grimau Puigibert, Mohsen Falamarzi Askarani, Jacob H. Davidson +7
Entangling quantum systems with different characteristics through the exchange of photons is a prerequisite for building future quantum networks. Proving the presence of entangleme…
Characterization of Depolarizing Channels Using Two-Photon Intereference
Gustavo C. Amaral, Guilherme P. Temporão
Depolarization is one of the most important sources of error in a quantum communication link that can be introduced by the quantum channel. Even though standard quantum process tom…
Alignment-free characterization of polarizing beamsplitters
Felipe Calliari, Pedro Tovar, Christiano Nascimento +3
Traditional methods for measurement of Polarizing Beamsplitter (PBS) parameters, especially the extinction ratio, require highly polarized light sources, alignment procedures and/o…
Full Optical Fiber Link Characterization with the BSS-Lasso
Raphael Saavedra, Pedro Tovar, Gustavo C. Amaral +1
Manipulation of the detected backscattered Rayleigh signal inside the bandwidth of a frequency-swept optical sub-carrier propagating into an optical fiber permits an efficient loca…
Linearized Bregman Iterations for Automatic Optical Fiber Fault Analysis
Michael Lunglmayr, Gustavo C. Amaral
Supervision of the physical layer of optical networks is an extremely relevant subject. To detect fiber faults, single-ended solutions such as the Optical Time Domain Reflectometer…
Complementarity Analysis of Interference between Frequency-Displaced Photonic Wave-Packets
Gustavo C. Amaral, Elisa F. Carneiro, Guilherme P. Temporão +1
The complementarity relation between the visibility and the spectral distinguishability of frequency-displaced photonic wave-packets in a Hong-Ou-Mandel interferometer is studied.…
A Low-Frequency Tone Sweep Method for in-Service Fault Location in Sub-Carrier Multiplexed Optical Fiber Networks
Gustavo C. Amaral, Diego C. Villafani, Andrea Baldivieso +5
We demonstrate an optical fiber fault location method based on the frequency response of the modulated fiber optical backscattered signal in a steady state low-frequency step regim…
Quantum random number generation enhanced by weak-coherent states interference
T. Ferreira da Silva, G. B. Xavier, G. C. Amaral +2
We propose and demonstrate a technique for quantum random number generation based on the random population of the output spatial modes of a beam splitter when both inputs are simul…
Fast Polarization Switch for Polarization-Based Quantum Communication
Vinicius M. Lima, Felipe Calliari, Joaquim D. Garcia +4
We present a complete optoelectronic unit for polarization visualization, switching and control. The system is based on an FPGA unit and comprises: an acquisition unit containing a…
An Optimal Polarization Tracking Algorithm for Lithium-Niobate-based Polarization Controllers
Joaquim D. Garcia, Gustavo C. Amaral
We present an optimal algorithm for the three-stage arbitrary polarization tracking using Lithium-Niobate-based Polarization Controllers: device calibration, polarization state rot…
Adaptive Trend Filter via Fast Coordinate Descent
Mario Souto, Joaquim D. Garcia, Gustavo C. Amaral
Identifying the unknown underlying trend of a given noisy signal is extremely useful for a wide range of applications. The number of potential trends might be exponential, which ca…
Adaptive Filter for Automatic Identification of Multiple Faults in a Noisy OTDR Profile
Jean Pierre von der Weid, Mario H. Souto, Joaquim D. Garcia +1
We present a novel methodology able to distinguish meaningful level shifts from typical signal fluctuations. A two-stage regularization filtering can accurately identify the locati…
Sub-Poisson States Heralded at a Hong-Ou-Mandel Interference Peak
G. C. Amaral, F. Calliari, T. Ferreira da Silva +2
A peak in coincidence events has been observed in a modified Hong-Ou-Mandel interferometer fed with weak coherent states inside the region of overlapping wave-packets. The inversio…
Few-Photon Heteorodyne Spectroscopy
Gustavo C Amaral, Thiago Ferreira da Silva, Guilherme P Temporão +1
We perform a high resolution Fourier Transform Spectroscopy of optical sources in the few-photon regime based on the phenomenon of two-photon interference in a beam splitter. From…