146 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of LisbonPT22 papers
- Instituto de TelecomunicaçõesPT11 papers
- ISEG - Instituto Superior de Economia e GestãoPT10 papers
- Universidade Técnica de LisboaPT7 papers
- Instituto Superior TécnicoPT5 papers
- Centro de MatemáticaPT3 papers
- Google (United States)US3 papers
- Universidade do PortoPT3 papers
- University College LondonGB3 papers
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalMX2 papers
- Massachusetts Institute of TechnologyUS2 papers
- Max Planck Institute for MathematicsDE2 papers
27 papers
BERT in Plutarch's Shadows
Ivan P. Yamshchikov, Alexey Tikhonov, Yorgos Pantis +2
The extensive surviving corpus of the ancient scholar Plutarch of Chaeronea (ca. 45-120 CE) also contains several texts which, according to current scholarly opinion, did not origi…
What is Wrong with Language Models that Can Not Tell a Story?
Ivan P. Yamshchikov, Alexey Tikhonov
This paper argues that a deeper understanding of narrative and the successful generation of longer subjectively interesting texts is a vital bottleneck that hinders the progress in…
VIX pricing in the rBergomi model under a regime switching change of measure
Henrique Guerreiro, João Guerra
The rBergomi model under the physical measure consists of modeling the log-variance as a truncated Brownian semi-stationary process. Then, a deterministic change of measure is appl…
Fine-Tuning Transformers: Vocabulary Transfer
Vladislav Mosin, Igor Samenko, Alexey Tikhonov +2
Transformers are responsible for the vast majority of recent advances in natural language processing. The majority of practical natural language processing applications of these mo…
Persistent Strange attractors in 3D Polymatrix Replicators
Telmo Peixe, Alexandre A. Rodrigues
We introduce a one-parameter family of polymatrix replicators defined in a three-dimensional cube and study its bifurcations. For a given interval of parameters, this family exhibi…
Periodic attractor in the discrete time best-response dynamics of the Rock-Paper-Scissors game
José Pedro Gaivão, Telmo Peixe
The Rock-Paper-Scissors (RPS) game is a classic non-cooperative game widely studied in terms of its theoretical analysis as well as in its applications, ranging from sociology and…
On the product formula and convolution associated with the index Whittaker transform
Rúben Sousa, Manuel Guerra, Semyon Yakubovich
We deduce a product formula for the Whittaker function whose kernel does not depend on the second parameter. Making use of this formula, we define the positivity-preserving con…
Scattering theory for the Schrödinger-Debye System
Simão Correia, Filipe Oliveira
We study the Schrödinger-Debye system over iu_t+\frac 12Δu=uv,\quad μv_t+v=λ|u|^2 and establish the global existence and scattering of small solutions for initial da…
Multinomial method for option pricing under Variance Gamma
Nicola Cantarutti, João Guerra
This paper presents a multinomial method for option pricing when the underlying asset follows an exponential Variance Gamma process. The continuous time Variance Gamma process is a…
Barrier Option Pricing under the 2-Hypergeometric Stochastic Volatility Model
Rúben Sousa, Ana Bela Cruzeiro, Manuel Guerra
We investigate the pricing of financial options under the 2-hypergeometric stochastic volatility model. This is an analytically tractable model that reproduces the volatility smile…
Minimising the heat dissipation of quantum information erasure
M. Hamed Mohammady, Masoud Mohseni, Yasser Omar
Quantum state engineering and quantum computation rely on information erasure procedures that, up to some fidelity, prepare a quantum object in a pure state. Such processes occur w…
Transport of quantum excitations coupled to spatially extended nonlinear many-body systems
Stefano Iubini, Octavi Boada, Yasser Omar +1
The role of noise in the transport properties of quantum excitations is a topic of great importance in many fields, from organic semiconductors for technological applications to li…
Degradation of entanglement between two accelerated parties: Bell states under the Unruh effect
Benedikt Richter, Yasser Omar
We study the entanglement of families of Unruh modes in the Bell states and …
Measurement-Assisted Quantum Communication in Spin Channels with Dephasing
Abolfazl Bayat, Yasser Omar
We propose a protocol for countering the effects of dephasing in quantum state transfer over a noisy spin channel weakly coupled to the sender and receiver qubits. Our protocol, ba…
Systematic Dimensionality Reduction for Quantum Walks: Optimal Spatial Search and Transport on Non-Regular Graphs
Leonardo Novo, Shantanav Chakraborty, Masoud Mohseni +2
Continuous time quantum walks provide an important framework for designing new algorithms and modelling quantum transport and state transfer problems. Often, the graph representing…
Asymptotic Poincaré Maps along the edges of Polytopes
Hassan Najafi Alishah, Pedro Duarte, Telmo Peixe
For a class of flows on polytopes, including many examples from Evolutionary Game Theory, we describe a piecewise linear model which encapsulates the asymptotic dynamics along the…
Ergodicity of polygonal slap maps
Gianluigi Del Magno, João Lopes Dias, Pedro Duarte +1
Polygonal slap maps are piecewise affine expanding maps of the interval obtained by projecting the sides of a polygon along their normals onto the perimeter of the polygon. These m…
Disorder-assisted quantum transport in suboptimal decoherence regimes
Leonardo Novo, Masoud Mohseni, Yasser Omar
We investigate quantum transport in binary tree structures and in hypercubes for the disordered Frenkel-exciton Hamiltonian under pure dephasing noise. We compute the energy transp…
Dissipative outer billiards: a case study
Gianluigi Del Magno, José Pedro Gaivão, Eugene Gutkin
We study dissipative polygonal outer billiards, i.e. outer billiards about convex polygons with a contractive reflection law. We prove that dissipative outer billiards about any tr…
Graphene Enabled Low-Control Quantum Gates between Static and Mobile Spins
G. Cordourier-Maruri, Y. Omar, R. de Coss +1
We show that the feature of Klein tunneling makes graphene a unique interface for implementing low control quantum gates between static and mobile qubits. A ballistic electron spin…
Geometrical effects on energy transfer in disordered open quantum systems
M. Mohseni, A. Shabani, S. Lloyd +2
We explore various design principles for efficient excitation energy transport in complex quantum systems. We investigate energy transfer efficiency in randomly disordered geometri…
Chaos in the square billiard with a modified reflection law
Gianluigi Del Magno, João Lopes Dias, Pedro Duarte +2
The purpose of this paper is to study the dynamics of a square billiard with a non-standard reflection law such that the angle of reflection of the particle is a linear contraction…
Implementing quantum gates through scattering between a static and a flying qubit
G. Cordourier-Maruri, F. Ciccarello, Y. Omar +3
We investigate whether a two-qubit quantum gate can be implemented in a scattering process involving a flying and a static qubit. To this end, we focus on a paradigmatic setup made…
A new proof of the Herman-Avila-Bochi formula for Lyapunov exponents of SL(2,R)-cocycles
Alexandre T. Baraviera, Joao Lopes Dias, Pedro Duarte
We study the geometry of the action of SL(2,R) on the projective line in order to present a new and simpler proof of the Herman-Avila-Bochi formula. This formula gives the average…