Guilherme B Xavier
Associate Professor, Head of Division, Docent
My main research focus is on experimental quantum communications, specializing in quantum key distribution, propagation of entanglement, optical fibers and associated optoelectronic instrumentation.
Publication list
Recent preprints
Guilherme B. Xavier, Jan-Åke Larsson, Paolo Villoresi, Giuseppe Vallone, Adán Cabello, Energy-time and time-bin entanglement: past, present and future (2025) 
https://arxiv.org/abs/2503.14675
Alvaro Alarcón, Santiago Gómez, Daniel Spegel-Lexne, Joakim Argillander, Jaime Cariñe, Gustavo Cañas, Gustavo Lima, Guilherme B. Xavier, All-in-fiber dynamic orbital angular momentum mode sorting (2023) https://arxiv.org/abs/2306.16472
Journal papers
Daniel Spegel-Lexne, Santiago Gomez, Joakim Argillander, Marcin Pawlowski, Pedro R. Dieguez, Alvaro Alarcon, Guilherme B Xavier, 
Experimental demonstration of the equivalence of entropic uncertainty with wave-particle duality, Science Advances 10:eadr2007 (2024) 
https://doi.org/10.1126/sciadv.adr2007
Francesco B. L. Santagiustina, Costantino Agnesi, Alvaro Alarcon, Adan Cabello, Guilherme B Xavier, Paolo Villoresi, Giuseppe Vallone, Experimental post-selection loophole-free time-bin and energy-time nonlocality with integrated photonics, Optica 11:498-511 (2024) https://doi.org/10.1364/OPTICA.499247 https://arxiv.org/abs/2302.06522
Alvaro Alarcon, Joakim Argillander, Daniel Spegel-Lexne, Guilherme B Xavier, Dynamic generation of photonic spatial quantum states with an all-fiber platform, Optics Express 31:10673-10683 (2023) https://doi.org/10.1364/OE.481974
Alvaro Alarcon, Santiago Gomez, Daniel Spegel-Lexne, Joakim Argillander, Jaime Carine, Gustavo Canas, Gustavo Lima, Guilherme B Xavier, All-in-Fiber Dynamically Reconfigurable Orbital Angular Momentum Mode Sorting, ACS Photonics 10:3700-3707 (2023) https://doi.org/10.1021/acsphotonics.3c00825
Joakim Argillander, Alvaro Alarcon, Chunxiong Bao, Chaoyang Kuang, Gustavo Lima, Feng Gao, Guilherme B. Xavier, Quantum random number generation based on a perovskite light emitting diode, Communications Physics 6:157 (2023) https://doi.org/10.1038/s42005-023-01280-3
Joakim Argillander, Alvaro Alarcon, Guilherme B. Xavier, A tunable quantum random number generator based on a fiber-optical Sagnac interferometer, Journal of Optics 24:064010 (2022) https://doi.org/10.1088/2040-8986/ac68f4 https://arxiv.org/abs/2205.04484
S. Sarmiento, S. Etcheverry, J. Aldama, I. H. Lopez, L. T. Vidarte, Guilherme B Xavier, D. A. Nolan, J. S. Stone, M. J. Li, D. Loeber, V Pruneri, Continuous-variable quantum key distribution over a 15 km multi-core fiber, New Journal of Physics 24:063011 (2022) https://doi.org/10.1088/1367-2630/ac753b https://arxiv.org/abs/2201.03392
Alvaro Alarcon, Joakim Argillander, G. Lima, Guilherme B Xavier, Few-Mode-Fiber Technology Fine-tunes Losses in Quantum Communication Systems, Physical Review Applied 16:034018 (2021) https://doi.org/10.1103/PhysRevApplied.16.034018 https://arxiv.org/abs/2103.05018
Jaime Carine, Santiago A. Gomez, Giannini F. Obregon, Esteban S. Gomez, Miguel Figueroa, Gustavo Lima, Guilherme B Xavier, Post-Measurement Adjustment of the Coincidence Window in Quantum Optics Experiments, IEEE Access 9:94010-94016 (2021) https://doi.org/10.1109/ACCESS.2021.3093371
Piotr Mironowicz, Gustavo Canas, Jaime Carine, Esteban S. Gomez, Johanna F. Barra, Adan Cabello, Guilherme B Xavier, Gustavo Lima, Marcin Pawlowski, Quantum randomness protected against detection loophole attacks, Quantum Information Processing 20:39 (2021) https://doi.org/10.1007/s11128-020-02948-3
Guilherme B. Xavier, Gustavo Lima, Quantum information processing with space-division multiplexing optical fibres, Communications Physics 3:9 (2020) https://doi.org/10.1038/s42005-019-0269-7 https://arxiv.org/abs/1905.12644
Alvaro Alarcon, P. Gonzalez, J. Carine, G. Lima, Guilherme B Xavier, Polarization-independent single-photon switch based on a fiber-optical Sagnac interferometer for quantum communication networks, Optics Express 28:33731-33738 (2020) https://doi.org/10.1364/OE.408637 https://arxiv.org/abs/2009.02385
J. Carine, G. Canas, P. Skrzypczyk, I Supic, N. Guerrero, T. Garcia, L. Pereira, M. A. S. Prosser, Guilherme B Xavier, A. Delgado, S. P. Walborn, D. Cavalcanti, G. Lima, Multi-core fiber integrated multi-port beam splitters for quantum information processing, Optica 7:542-550 (2020) https://doi.org/10.1364/OPTICA.388912
Rui Lin, Aleksejs Udalcovs, Oskars Ozolins, Xiaodan Pang, Lin Gan, Ming Tang, Songnian Fu, Serge Popov, Thiago Ferreira Da Silva, Guilherme B Xavier, Jiajia Chen, Telecommunication Compatibility Evaluation for Co-existing Quantum Key Distribution in Homogenous Multicore Fiber, IEEE Access 8:78836-78846 (2020) https://doi.org/10.1109/ACCESS.2020.2990186
C. Abellán, A. Acín, A. Alarcón, O. Alibart, C. K. Andersen, F. Andreoli, A. Beckert, F. A. Beduini, A. Bendersky, M. Bentivegna, P. Bierhorst, D. Burchardt, A. Cabello, J. Cariñe, S. Carrasco, G. Carvacho, D. Cavalcanti, R. Chaves, J. Cortés-Vega, A. Cuevas, A. Delgado, H. de Riedmatten, C. Eichler, P. Farrera, J. Fuenzalida, M. García-Matos, R. Garthoff, S. Gasparinetti, T. Gerrits, F. Ghafari Jouneghani, S. Glancy, E. S. Gómez, P. González, J. -Y. Guan, J. Handsteiner, J. Heinsoo, G. Heintze, A. Hirschmann, O. Jiménez, F. Kaiser, E. Knill, L. T. Knoll, S. Krinner, P. Kurpiers, M. A. Larotonda, Jan-Åke Larsson, A. Lenhard, H. Li, M. -H. Li, G. Lima, B. Liu, Y. Liu, I. H. López Grande, T. Lunghi, X. Ma, O. S. Magaña-Loaiza, P. Magnard, A. Magnoni, M. Martí-Prieto, D. Martínez, P. Mataloni, A. Mattar, M. Mazzera, R. P. Mirin, M. W. Mitchell, S. Nam, M. Oppliger, J. -W. Pan, R. B. Patel, G. J. Pryde, D. Rauch, K. Redeker, D. Rieländer, M. Ringbauer, T. Roberson, W. Rosenfeld, Y. Salathé, L. Santodonato, G. Sauder, T. Scheidl, C. T. Schmiegelow, F. Sciarrino, A. Seri, L. K. Shalm, S. -C Shi, S. Slussarenko, M. J. Stevens, S. Tanzilli, F. Toledo, J. Tura, R. Ursin, P. Vergyris, V. B. Verma, T. Walter, A. Wallraff, Z. Wang, H. Weinfurter, M. M. Weston, A. G. White, C. Wu, Guilherme B. Xavier, L. You, X. Yuan, A. Zeilinger, Q. Zhang, W. Zhang, J. Zhong, Challenging Local Realism with Human Choices, Nature 557:212-216 (2018) https://doi.org/10.1038/s41586-018-0085-3 https://arxiv.org/abs/1805.04431
E. S. Gomez, P. Riquelme, M. A. Solis-Prosser, P. Gonzalez, E. Ortega, Guilherme B Xavier, G. Lima, Tunable entanglement distillation of spatially correlated down-converted photons, Optics Express 26:13961-13972 (2018) https://doi.org/10.1364/OE.26.013961
Edgar A. Aguilar, Mate Farkas, Daniel Martinez, Matias Alvarado, Jaime Carine, Guilherme B Xavier, Johanna F. Barra, Gustavo Canas, Marcin Pawlowski, Gustavo Lima, Certifying an Irreducible 1024-Dimensional Photonic State Using Refined Dimension Witnesses, Physical Review Letters 120:230503 (2018) https://doi.org/10.1103/PhysRevLett.120.230503
M. A. Solís-Prosser, P. González, J. Fuenzalida, S. Gómez, G. B. Xavier, A. Delgado, G. Lima, Experimental Multi-Party Sequential State Discrimination, Phys. Rev. A 94:042309 (2016) https://doi.org/10.1103/PhysRevA.94.042309 https://arxiv.org/abs/1505.02622
T. Ferreira da Silva, G. B. Xavier, G. C. Amaral, G. P. Temporão, J. P. von der Weid, Quantum random number generation enhanced by weak-coherent states interference, Opt. Express 24:19574 (2016) https://doi.org/10.1364/OE.24.019574 https://arxiv.org/abs/1608.05155
Gonzalo Carvacho, Jaime Cariñe, Gabriel Saavedra, Álvaro Cuevas, Jorge Fuenzalida, Felipe Toledo, Miguel Figueroa, Adán Cabello, Jan-Åke Larsson, Paolo Mataloni, Gustavo Lima, Guilherme B. Xavier, Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network, Phys. Rev. Lett. 115:030503 (2015) https://doi.org/10.1103/PhysRevLett.115.030503 https://arxiv.org/abs/1503.07535
P. Gonzalez, L. Rebon, T. Ferreira da Silva, M. Figueroa, C. Saavedra, M. Curty, G. Lima, G. B. Xavier, W. A. T. Nogueira, Quantum key distribution with untrusted detectors, Phys. Rev. A 92:022337 (2015) https://doi.org/10.1103/PhysRevA.92.022337 https://arxiv.org/abs/1410.1422
A. Cuevas, G. Carvacho, G. Saavedra, J. Cariñe, W. A. T. Nogueira, M. Figueroa, A. Cabello, P. Mataloni, G. Lima, G. B. Xavier, Long-distance distribution of genuine energy-time entanglement, Nat. Commun. 4:2871 (2013) https://doi.org/10.1038/ncomms3871 https://arxiv.org/abs/1306.6641
G. B. Xavier, G. Vilela de Faria, T. Ferreira da Silva, G. P. Temporao, J. P. von der Weid, Active polarization control for quantum communication in long-distance optical fibers with shared telecom traffic, Microwave and Optical Technology Letters 53:2661 (2011) https://arxiv.org/abs/0912.4433
G. B. Xavier, J. P. von der Weid, Stable single-photon interference in a 1 km fiber-optical Mach-Zehnder interferometer with continuous phase adjustment, Opt. Lett. 36:1764 (2011) https://doi.org/10.1364/OL.36.001764 https://arxiv.org/abs/1104.2866
G. B. Xavier, N. Walenta, G. Vilela de Faria, G. P. Temporao, N. Gisin, H. Zbinden, J. P. von der Weid, Experimental polarization encoded quantum key distribution over optical fibres with real-time continuous birefringence compensation, New J. Phys. 11:045015 (2009) https://doi.org/10.1088/1367-2630/11/4/045015 https://arxiv.org/abs/0905.0394
G. B. Xavier, T. Ferreira da Silva, G. Vilela de Faria, G. P. Temporao, J. P. von der Weid, Practical random number generation protocol for entanglement-based quantum key distribution, Quantum Information & Computation 9:0683-0692 (2009) https://arxiv.org/abs/0810.0483
Conference papers
Joakim Argillander, Alvaro Alarcon, Chunxiong Bao, Chaoyang Kuang, Gustavo Lima, Feng Gao, Guilherme B Xavier, Secure quantum random number generation with perovskite photonics, QUANTUM COMPUTING, COMMUNICATION, AND SIMULATION IV, Proceedings of SPIE, SPIE-INT SOC OPTICAL ENGINEERING (2024) https://doi.org/10.1117/12.2692061
Alvaro Alarcon, Joakim Argillander, Daniel Spegel-Lexne, Guilherme B. Xavier, Quantum Random Number Generation Based on Spatial Modal Superposition over Few-Mode-Fibers, Frontiers in Optics + Laser Science 2022 (FIO, LS), Frontiers in Optics + Laser Science 2022 (FIO, LS), Optica Publishing Group (2022) https://doi.org/10.1364/FIO.2022.JTu5A.28
Joakim Argillander, Alvaro Alarcon, Guilherme B. Xavier, All-fiber Dynamically Tunable Beamsplitter for Quantum Random Number Generators, Latin America Optics and Photonics Conference, Optica Publishing Group (ed.), Optica Publishing Group (2022) https://doi.org/10.1364/LAOP.2022.Th1A.2
Alvaro Alarcon, Joakim Argillander, Guilherme B. Xavier, Creating Spatial States of Light for Quantum Information with Photonic Lanterns, Applied Industrial Optics 2021, G. Miller, A. Smith, I. Capraro, and J. Majors (eds.), OSA Technical Digest, Optical Society of America (2021) https://doi.org/10.1364/AIO.2021.W2A.2
Alvaro Alarcon, Guilherme B. Xavier, A few-mode fiber Mach-Zehnder interferometer for quantum communication applications, Frontiers in Optics / Laser Science, B. Lee, C. Mazzali, K. Corwin, and R. Jason Jones (eds.), OSA Technical Digest, Optical Society of America (2020) https://doi.org/10.1364/LS.2020.LM1F.6
R. Lin, L. Gan, A. Udalcovs, O. Ozolins, X. Pang, L. Shen, Sergei Popov, M. Tang, S. Fu, W. Tong, D. Liu, T. Ferreira da Silva, Guilherme B Xavier, J. Chen, Spontaneous Raman Scattering Effects in Multicore Fibers: Impact on Coexistence of Quantum and Classical Channels, 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE (2019)
Rui Lin, Aleksejs Udalcovs, Oskars Ozolins, Xiaodan Pang, Lin Gan, Li Shen, Ming Tang, Songnian Fu, Chen Yang, Weijun Tong, Deming Liu, Thiago Ferreira da Silva, Guilherme B Xavier, Jiajia Chen, Integrating Quantum Key Distribution with the Spatial Division Multiplexing Enabled High Capacity Optical Networks, 2018 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP), Asia Communications and Photonics Conference and Exhibition, IEEE (2018)
Preprints
G. B. Xavier, G. P. Temporao, J. P. von der Weid, Employing long fibre-optical Mach- Zehnder interferometers for quantum cryptography with orthogonal states (2012) https://arxiv.org/abs/1206.2701
G. B. Xavier, T. R. da Silva, G. P. Temporao, J. P. von der Weid, Polarisation drift compensation in an 8 km long Mach-Zehnder fibre-optical interferometer for quantum communication (2011) https://arxiv.org/abs/1105.0597