Article
Multidisciplinary Sciences
The Vinh Ngo, Dmitriy Tsarev, Ray-Kuang Lee, Alexander P. Alodjants
Summary: A novel platform for quantum metrology based on qubit states of two Bose-Einstein condensate solitons is proposed, allowing for macroscopic quantum self-trapping and distinction between different macroscopic states.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Yuxin Ma, Biqiang Jiang, Yasong Guo, Pengwei Zhang, Tonglei Cheng, Xuetao Gan, Jianlin Zhao
Summary: We present an all-fiber scheme for second harmonic generation (SHG) by incorporating gallium selenide (GaSe) nanosheets into a suspended-core fiber (SCF). The phase-matching modes and optimal SCF length are determined through mode analysis and theoretical calculations. The SHG signal, observed under milliwatt-level pump light, exhibits a quadratic growth with increasing pump power due to the long-distance interaction between the pumped fundamental mode and GaSe nanosheets. Additionally, the SHG process is achieved over a broad wavelength range by varying the pump wavelength.
Article
Engineering, Electrical & Electronic
Maria Morant, Luis Gonzalez-Guerrero, Cyril C. Renaud, Roberto Llorente
Summary: This paper introduces and demonstrates a photonic THz generation technique utilizing an optical frequency comb and multicore fiber transmission, showing the feasibility and advantages of remote generation and simplified digital signal processing. The performance of the proposed technique is evaluated experimentally, highlighting the benefits of using comb generation to reduce frequency offset fluctuation and simplify DSP.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Davide Bacco, Jacob F. F. Bulmer, Manuel Erhard, Marcus Huber, Stefano Paesani
Summary: This research addresses the experimental challenges of high-dimensional quantum networks by using standard quantum optical resources and linear optics, simplifying implementation and optimizing network parameters.
Article
Optics
Davide Bacco, Nicola Biagi, Ilaria Vagniluca, Tetsuya Hayashi, Antonio Mecozzi, Cristian Antonelli, Leif K. Oxenlowe, Alessandro Zavatta
Summary: Multicore fibers are expected to revolutionize optical communications with their larger transmission bandwidth and smaller footprint. Although recent research has explored their use in quantum communication, the feasibility of using long-distance multicore fibers for quantum applications still needs to be proven.
PHOTONICS RESEARCH
(2021)
Article
Optics
S. V. Suchkov, I. S. Chekhovskoy, O. V. Shtyrina, S. Wabnitz, M. P. Fedoruk
Summary: We investigate the linear and nonlinear modes of parity-time (PT)-symmetric multicore fibers with a twist of peripheral cores with gain and loss around the lossless central core. We determine the spectral properties of such a light guiding system and demonstrate that the presence of the lossless central core combined with the fiber twist may significantly change the supermode structure and PT-symmetry breaking threshold of the multicore fiber with gain and loss. We also construct stationary nonlinear modes of the fiber and verify their stability.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Pascal Hanzi, Benoit Sierro, Zhixin Liu, Valerio Romano, Anupamaa Rampur, Alexander M. Heidt
Summary: The recent development of fiber supercontinuum (SC) sources with ultra-low noise levels has significantly advanced various research topics. However, satisfying the demands for maximum spectral bandwidth and minimum noise simultaneously remains a challenge. This study proposes a hybrid approach that utilizes two separate fibers optimized for nonlinear temporal compression and spectral broadening, respectively, providing new design flexibility and significant performance improvements. The results show that hybrid all-normal dispersion (ANDi) highly nonlinear fibers (HNLF) achieve broad spectral bandwidths, extremely low noise levels, and smooth spectra, making them suitable for low-noise SC sources in applications such as biophotonic imaging, coherent optical communications, and ultrafast photonics.
Article
Optics
Peng Gao, Liang Duan, Xiankun Yao, Zhan-Ying Yang, Wen-Li Yang
Summary: This study presents a method to controllably generate six kinds of nonlinear waves on continuous waves, and successfully implements quantitative control over their dynamical features. The results may have significant implications for research in the field of optics.
Article
Engineering, Electrical & Electronic
Yingyu Chen, Yongguang Xiao, Shaoyi Chen, Fengmao Xie, Zhengyong Liu, Dawei Wang, Xingwen Yi, Chao Lu, Zhaohui Li
Summary: The field test of space division multiplexing (SDM) technology demonstrates its great potential in optical communication, achieving the largest capacity worldwide. Additionally, it shows possibilities for other applications in traffic monitoring.
IEEE COMMUNICATIONS MAGAZINE
(2023)
Article
Physics, Applied
Yoann Pelet, Gregory Sauder, Mathis Cohen, Laurent Labonte, Olivier Alibart, Anthony Martin, Sebastien Tanzilli
Summary: We present a field-deployed quantum key distribution (QKD) link based on energy-time entanglement. The link connects three nodes, spanning over a total distance of 50 km between the cities of Nice and Sophia Antipolis, using commercial grade optical fibers. The system achieves a secure key rate of 7.0 kbit/s for one pair of channels and operates on a conventional metropolitan fiber grid.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Ravil Idrisov, Tigran Baghdasaryan, Manfred Rothhardt, Thomas Geernaert, Hartmut Bartelt
Summary: The specific angular orientation of complex, structured optical fibers is crucial for various applications. This paper presents a measurement method based on the analysis of refractive-diffractive scattering patterns, which enables accurate determination of the fiber orientation without measuring or reconstructing the detailed cross section.
ADVANCED PHOTONICS RESEARCH
(2022)
Article
Optics
Ce Su, Bilas Chowdhury, Swaroopini Harish, Mingxuan Tu, Syed Murshid
Summary: This study presents a two-channel spatial division multiplexed (SDM) system combined with an all-optical four-level pulse amplitude modulation (PAM4) scheme to increase the data rate. The experimental results demonstrate the key achievements of the system through spatial reuse and the use of the all-optical PAM4 scheme.
Article
Engineering, Electrical & Electronic
Yanfang Hu, Pengtao Luo, Ruohui Wang, Wenhua Zhu, Xueguang Qiao
Summary: In this study, a two-dimensional vector vibration sensor based on a multicore fiber and Fabry-Perot interferometer is proposed. The sensor allows for the identification of vibration orientation and has adjustable operating frequency and sensitivity, making it suitable for various vibration measurement applications.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Shou-Fei Gao, Ying-Ying Wang, Federico Belli, Christian Brahms, Pu Wang, John C. Travers
Summary: A route to supercontinuum generation in gas-filled hollow-core anti-resonant fibers is demonstrated through the creation of a broad vibrational Raman frequency comb, followed by continuous broadening and merging of the comb lines through either rotational Raman scattering or the optical Kerr effect. The experimental results show a supercontinuum spanning from 440 to 1200 nm, with an additional deep ultraviolet continuum from 250 to 360 nm, and numerical results suggest even broader supercontinuum spectra extending from the ultraviolet to mid-infrared can be achieved.
LASER & PHOTONICS REVIEWS
(2022)
Article
Engineering, Electrical & Electronic
Yanfang Hu, Pengtao Luo, Ruohui Wang, Wenhua Zhu, Xueguang Qiao
Summary: This letter proposes a two-dimensional vector vibration sensor based on Fabry-Perot interferometer (FPI) inscribed by femtosecond laser in a multicore fiber (MCF). Due to the special spatial distribution of MCF cores, the sensor enables the orientation identification of two-dimensional vibration. The vibration sensor has an acceleration sensitivity of 0.1 V/g. Moreover, the operating frequency and sensitivity of the sensor can be varied by adjusting the length of the optical fiber and the weight of the load, allowing it to be used in various vibration measurement applications.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Quantum Science & Technology
Piotr Mironowicz, Gustavo Canas, Jaime Carine, Esteban S. Gomez, Johanna F. Barra, Adan Cabello, Guilherme B. Xavier, Gustavo Lima, Marcin Pawlowski
Summary: A method is proposed to protect semi-device-independent private quantum randomness generators against detection inefficiency attacks by introducing a blocking device that adds failures in communication between preparation and measurement devices. Protection against these attacks is demonstrated experimentally using weak coherent states and standard avalanche photo-detectors.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Applied
Mate Farkas, Nayda Guerrero, Jaime Carine, Gustavo Canas, Gustavo Lima
Summary: In this work, we experimentally investigate the feasibility of using self-testing protocols to verify the proper functioning of quantum devices built with modern space-division multiplexing optical fiber technology. By implementing a multiarm interferometer with multicore optical fibers, we successfully achieved self-testing of two four-dimensional MUBs, quantifying the incompatibility robustness of the measurements and the randomness extractable from the outcomes. The results are of practical interest for future quantum works relying on space-division multiplexing optical fibers due to the core importance of MUBs in several quantum-information protocols.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Santiago Rojas-Rojas, Gustavo Canas, Gabriel Saavedra, Esteban S. Gomez, Stephen P. Walborn, Gustavo Lima
Summary: In optical communications, space-division multiplexing using ring-core fibers has shown to enhance transmission rates. By studying the optimal coupling conditions of LG and PV beams, it is possible to maximize coupling efficiency and multiplex a high counts of OAM channels into these fibers. PV beams offer nearly perfect coupling efficiencies for all spatial modes, making them an attractive solution for efficient multiplexing.
Article
Physics, Multidisciplinary
G. Canas, E. S. Gomez, E. Baradit, G. Lima, S. P. Walborn
Summary: Research on increasing the coupling of photon pairs produced by parametric down-conversion by pumping the non-linear crystal with a perfect vortex mode with orbital angular momentum l rather than a gaussian mode has shown an almost three-fold increase in coupling and a nearly constant shape in the two-photon orbital angular momentum spectrum. This presents an interesting scenario for quantum state engineering.
FRONTIERS IN PHYSICS
(2021)
Article
Multidisciplinary Sciences
S. Gomez, D. Uzcategui, I Machuca, E. S. Gomez, S. P. Walborn, G. Lima, D. Goyeneche
Summary: Certification of quantum nonlocality is crucial for practical applications like device-independent quantum cryptography, and here a technique is introduced to find a Bell inequality with the largest possible gap between quantum prediction and classical local hidden variable limit. This method offers an efficient strategy to certify quantum nonlocal correlations from experimental data without requiring extra measurements, and also reduces the photodetector efficiency needed to close the detection loophole.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Gustavo H. dos Santos, Andre G. de Oliveira, Nara Rubiano da Silva, Gustavo Canas, Esteban S. Gomez, Stuti Joshi, Yaseera Ismail, Paulo H. Souto Ribeiro, Stephen Patrick Walborn
Summary: Stimulated parametric down-conversion is a nonlinear optical process that can be used for phase conjugation and frequency conversion of an optical field. Partially coherent beams have unique characteristics, such as twist phase and nonzero orbital angular momentum, not present in coherent beams. The results could be useful for correcting wavefront distortion and synthesizing partially coherent beams in applications such as optical communication channels.
Article
Quantum Science & Technology
J. Carine, M. N. Asan-Srain, G. Lima, S. P. Walborn
Summary: The study investigates fourth-order interference using weak coherent states in multi-core optical fibers, showing that quantum correlations can be controlled and maximized by adjusting the intensity ratio between inputs. Despite being separable, these states can maximize geometric discord in certain instances, serving as a potential resource for protocols like remote state preparation.
NPJ QUANTUM INFORMATION
(2021)
Article
Optics
G. Canas, E. S. Gomez, G. H. dos Santos, A. G. de Oliveira, N. Rubiano da Silva, Stuti Joshi, Yaseera Ismail, P. H. S. Ribeiro, S. P. Walborn
Summary: The synthesis technique of the twisted Gaussian Schell Model is investigated, and the resulting beam parameters are evaluated. It is found that there is residual coherence, and a theoretical model is developed that agrees well with experimental data. A simple method to measure the twist phase is also demonstrated.
Article
Multidisciplinary Sciences
Santiago Gomez, Esteban S. Gomez, Omar Jimenez, Aldo Delgado, Stephen P. Walborn, Gustavo Lima
Summary: The study investigates the optimal discrimination of non-orthogonal states using the FRIO strategy and presents a versatile experimental scheme for this purpose. By adjusting the rate of inconclusive outcomes, the FRIO strategy allows for interpolation between unambiguous and minimum error discrimination. The experimental results show excellent agreement with the theoretical predictions.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Daniel Martinez, Esteban S. Gomez, Jaime Carine, Luciano Pereira, Aldo Delgado, Stephen P. Walborn, Armin Tavakoli, Gustavo Lima
Summary: The most common measurement method in quantum mechanics is to project the wavefunction onto orthogonal states that correspond to definite outcomes. However, it is possible to have generalized quantum measurements that do not fully project quantum states, which play an important role in quantum information tasks. In this study, we demonstrate the robust realization of high-quality generalized measurements in higher-dimensional systems using multiport beamsplitters. We implemented a seven-outcome generalized measurement in a four-dimensional Hilbert space with a fidelity of 99.7% and showed that it cannot be simulated by any conceivable quantum protocol based on standard projective measurements.
Article
Chemistry, Analytical
Lukas Palma Torres, Miguel Angel Solis-Prosser, Omar Jimenez, Esteban S. Gomez, Aldo Delgado
Summary: In this work, we study two methods to achieve probabilistic entanglement concentration for bipartite quantum systems with a large dimensionality for N=1. Firstly, we define an efficiency function Q which leads to solving a quadratic optimization problem. Secondly, we explore a method based on fixing the success probability and searching for the maximum amount of entanglement attainable.
Article
Quantum Science & Technology
Marcio M. Taddei, Jaime Carine, Daniel Martinez, Tania Garcia, Nayda Guerrero, Alastair A. Abbott, Mateus Araujo, Cyril Branciard, Esteban S. Gomez, Stephen P. Walborn, Leandro Aolita, Gustavo Lima
Summary: Models for quantum computation with circuit connections subject to the quantum superposition principle have been proposed recently. A quantum N-switch, a resource for several information-processing tasks, allows a control quantum system to determine the order in which a target quantum system undergoes N gate operations coherently. While the corresponding algorithm requires an experimentally unfeasible target-system dimension exponential in N, the quantum N-switch can provide an equivalent computational speedup with a target-system dimension as small as 2 regardless of N for a promise problem.
