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Christos Gagatsos<\/strong> studied physics (University of Athens, Greece) and holds a Ph.D. \u201cen Sciences de l\u2019Ing\u00e9nieur et Technologie \u201d (ULB, Ecole Polytechnique de Bruxelles, Belgium). He is a former postdoc in the Guha group. He has researched several topics of quantum optics such as noiseless amplification of quantum signals, quantum optics\u2019 problems that involve the calculation of von Neumann entropy, majorization relations, and quantum sensing. His research interests include everything that has to do with continuous variables. These days his research focuses on quantum estimation theory and non-Gaussian cluster states. As of April 2023, Dr. Gagatsos is now an Assistant Professor at the University of Arizona in the department of Electrical and Computer Engineering.<\/p>\n Link to personal homepage:\u00a0https:\/\/ece.engineering.arizona.edu\/faculty-staff\/faculty\/christos-gagatsos<\/a><\/p>\n Keywords:\u00a0Photonic Quantum Computing,\u00a0Quantum Sensing,\u00a0Quantum Communication<\/strong><\/em><\/p>\n Photon subtraction for non-Gaussian states generation which are a resource for optical quantum computation.<\/p>\n Active covert sensing: Unknown parameters\u2019 estimation while an adversary remains unaware of the sensing process.<\/p>\n Covert communications: Communication between parties under the constraint that an eavesdropper is unable to see if information transmission takes place or not.<\/p>\n Quantum enhanced Sagnac interferometer, i.e., angular velocity estimation with application to gyroscopes.<\/p>\n Christos Gagatsos studied physics (University of Athens, Greece) and holds a Ph.D. \u201cen Sciences de l\u2019Ing\u00e9nieur et Technologie \u201d (ULB, Ecole Polytechnique de Bruxelles, Belgium). He is a former postdoc in the Guha group. He has researched several topics of quantum optics such as noiseless amplification of quantum signals, quantum optics\u2019 problems that involve the calculation of von Neumann entropy,<\/p>\n","protected":false},"author":19,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-103","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/pages\/103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/comments?post=103"}],"version-history":[{"count":7,"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/pages\/103\/revisions"}],"predecessor-version":[{"id":1394,"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/pages\/103\/revisions\/1394"}],"wp:attachment":[{"href":"https:\/\/wp.optics.arizona.edu\/sguha\/wp-json\/wp\/v2\/media?parent=103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Research:<\/strong><\/h5>\n
Publications:<\/h5>\n
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\n Efficient representation of Gaussian states for multi-mode non-Gaussian quantum state engineering via subtraction of arbitrary number of photons.\u00a0Christos N. Gagatsos, Saikat Guha.\u00a0Phys. Rev. A 99, 053816 (2019)<\/a>.<\/td>\n Photonic Quantum Computing, Mathematical methods of quantum mechanics<\/td>\n<\/tr>\n \n Quantum enhanced estimation of diffusion.\u00a0Dominic Branford,\u00a0Christos N. Gagatsos,\u00a0Jai Grover,\u00a0Alexander J. Hickey,\u00a0Animesh Datta.\u00a0arXiv:1901.02497<\/a>.<\/td>\n Quantum Sensing<\/td>\n<\/tr>\n \n \u00a0Covert sensing using floodlight illumination.\u00a0Christos N. Gagatsos, Boulat A. Bash, Animesh Datta, Zheshen Zhang, Saikat Guha.\u00a0arXiv:1812.10743\u00a0<\/a>(accepted to Phys. Rev A<\/a>).<\/td>\n Quantum Sensing<\/td>\n<\/tr>\n \n \u00a0Bounding the quantum limits of precision for phase estimation with loss and thermal noise.\u00a0Christos N. Gagatsos, Boulat A. Bash, Saikat Guha, Animesh Datta.\u00a0Phys. Rev. A 96, 062306 (2017)<\/a>.<\/td>\n Quantum Sensing<\/td>\n<\/tr>\n \n Fundamental limits of quantum-secure\u00a0covert\u00a0optical sensing.\u00a0Boulat A. Bash, Christos N. Gagatsos, Saikat Guha, Animesh Datta.\u00a0 https:\/\/ieeexplore.ieee.org\/document\/8007122 (2017<\/a>).\u00a0A more detailed version\u00a0can be found\u00a0on\u00a0https:\/\/arxiv.org\/abs\/1701.06206<\/a>.<\/td>\n Quantum Sensing<\/td>\n<\/tr>\n \n Gaussian systems for quantum enhanced multiple phase estimation.\u00a0C. N. Gagatsos, D. Branford, A. Datta.\u00a0Phys. Rev. A 94, 042342(2016)<\/a>.<\/td>\n Quantum Sensing<\/td>\n<\/tr>\n \n Entropy generation in Gaussian quantum transformations:
\napplying the replica method to continuous-variable quantum information theory.\u00a0C. N. Gagatsos, A. I. Karanikas, G. Kordas, and N. J. Cerf. \u00a0npj Quantum Information 2, 15008 (2016)<\/a> .Heralded\u00a0noiseless amplification and attenuation of non-Gaussian\u00a0states of light.\u00a0C. N. Gagatsos, J. Fiurasek, A. Zavatta, M. Bellini, and N. J. Cerf. \u00a0Phys. Rev. A 89, 062311 (2014)<\/a>.<\/td>\n<\/td>\n<\/tr>\n \n Majorization relations and entanglement generation in a beam splitter.\u00a0C. N. Gagatsos, O. Oreshkov, N. J. Cerf.\u00a0Phys. Rev.\u00a0A 87,\u00a0042307 (2013<\/a>)<\/a>.<\/td>\n <\/td>\n<\/tr>\n \n \u00a0Mutual information\u00a0and Bose-Einstein condensation.C. N. Gagatsos, A. I. Karanikas and G. I. Kordas\u00a0Open Syst. Inf. Dyn. 20, 1350008 (2013)<\/a>.<\/td>\n <\/td>\n<\/tr>\n \n Probabilistic phase-insensitive\u00a0optical squeezer in compliance with causality.\u00a0C. N. Gagatsos, E. Karpov and N. J. Cerf.\u00a0Phys. Rev.\u00a0A 86, 012324 (2012)<\/a>.<\/td>\n \u00a0<\/em><\/td>\n<\/tr>\n \n Complex Time Evolution of\u00a0Open Quantum Systems.\u00a0C. N. Gagatsos, A. I. Karanikas and G. I. Kordas\u00a0Open Syst. Inf. Dyn. 18, 261 (2011)<\/a>.<\/td>\n \u00a0<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"