11 citations · 30 across the 10 of their papers we have counts for
10 papers
Efficient Simulation of Szegedy Quantum Walk Formulations and Algorithms
Sergio A. Ortega, Daniel K. Park
Quantum walks provide a versatile framework for quantum algorithms across a wide range of applications. We develop efficient classical simulation methods for Szegedy quantum walks…
Reverse Delegated Training and Private Inference via Perfectly-Secure Quantum Homomorphic Encryption
Sergio A. Ortega, Miguel A. Martin-Delgado
Quantum machine learning in cloud environments requires protecting sensitive data while enabling remote computation. Here we demonstrate the first realistic implementations of a pe…
A Quantum Signature Validation Algorithm for Efficient Detection of Tampered Transactions in Blockchain
Jaime Torres, Sergio A. Ortega, Miguel A. Martin-Delgado
The Quantum Signature Validation Algorithm (QSVA) is introduced as a novel quantum-based approach designed to enhance the detection of tampered transactions in blockchain systems.…
Implementing Semiclassical Szegedy Walks in Classical-Quantum Circuits for Homomorphic Encryption
Sergio A. Ortega, Pablo Fernández, Miguel A. Martin-Delgado
As cloud services continue to expand, the security of private data stored and processed in these environments has become paramount. This work delves into quantum homomorphic encryp…
Complex-Phase Extensions of Szegedy Quantum Walk on Graphs
Sergio A. Ortega, Miguel A. Martin-Delgado
This work introduces a graph-phased Szegedy's quantum walk, which incorporates link phases and local arbitrary phase rotations (APR), unlocking new possibilities for quantum algori…
Randomized SearchRank: A Semiclassical Approach to a Quantum Search Engine
Sergio A. Ortega, Miguel A. Martin-Delgado
The quantum SearchRank algorithm is a promising tool for a future quantum search engine based on PageRank quantization. However, this algorithm loses its functionality when the $N/…
SQUWALS: A Szegedy QUantum WALks Simulator
Sergio A. Ortega, Miguel A. Martin-Delgado
Szegedy's quantum walk is an algorithm for quantizing a general Markov chain. It has plenty of applications such as many variants of optimizations. In order to check its properties…
Discrete-time Semiclassical Szegedy Quantum Walks
Sergio A. Ortega, Miguel A. Martin-Delgado
Quantum walks are promising tools based on classical random walks, with plenty of applications such as many variants of optimization. Here we introduce the semiclassical walks in d…
Generalized Quantum PageRank Algorithm with Arbitrary Phase Rotations
Sergio A. Ortega, Miguel A. Martin-Delgado
The quantization of the PageRank algorithm is a promising tool for a future quantum internet. Here we present a modification of the quantum PageRank introducing arbitrary phase rot…
Causal structure of accelerating black holes
Jose A. R. Cembranos, Luis J. Garay, Sergio A. Ortega
Accelerating black holes are described by the so-called C-metric. In this work, we analyse the causal structure of such black holes by using null geodesics. We construct explicitly…