24 citations · 123 across the 22 of their papers we have counts for
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Observable-targeted variational quantum simulation of Hamiltonian dynamics
Leonardo Zambrano, Luciano Pereira, Antonio Acín
Standard variational quantum simulation seeks to reproduce the evolution of the full quantum state, although many applications require only the expectation values of a few observab…
Rigorous Time-dependent Hamiltonian Learning via Continuous Weak Measurements
Jesús Jiménez-Rodríguez, Giacomo Franceschetto, Antonio Acín +1
Characterizing the Hamiltonian that a quantum processor actually implements is central to calibrating and validating current quantum hardware. Many devices, however, operate with g…
Rigorous quantum state tomography for distributed quantum computing
Hans Mättig-Vásquez, Aldo Delgado, Luciano Pereira
Distributed quantum computing offers a promising approach to scaling quantum devices by networking multiple quantum processors. We present a quantum state tomography protocol tailo…
Hamiltonian learning via quantum Zeno effect
Giacomo Franceschetto, Egle Pagliaro, Luciano Pereira +2
Determining the Hamiltonian of a quantum system is essential for understanding its dynamics and validating its behavior. Hamiltonian learning provides a data-driven approach to rec…
Non-Markovianity in High-Dimensional Open Quantum Systems using Next-generation Multicore Optical Fibers
Santiago Rojas-Rojas, Daniel Martínez, Kei Sawada +5
With the advent of quantum technology, the interest in communication tasks assisted by quantum systems has increased both in academia and industry. Nonetheless, the transmission of…
Minimal orthonormal bases for pure quantum state estimation
Leonardo Zambrano, Luciano Pereira, Aldo Delgado
We present an analytical method to estimate pure quantum states using a minimum of three measurement bases in any finite-dimensional Hilbert space. This is optimal as two bases are…
Avoiding barren plateaus in the variational determination of geometric entanglement
Leonardo Zambrano, Andrés Damián Muñoz-Moller, Mario Muñoz +2
The barren plateau phenomenon is one of the main obstacles to implementing variational quantum algorithms in the current generation of quantum processors. Here, we introduce a meth…
Detecting entanglement of unknown states by violating the Clauser-Horne-Shimony-Holt inequality
J. Cortés-Vega, J. F. Barra, L. Pereira +1
Entangled states play a fundamental role in Quantum Mechanics and are at the core of many contemporary applications, such as quantum communication and quantum computing. Therefore,…
Parallel tomography of quantum non-demolition measurements in multi-qubit devices
L. Pereira, J. J. García-Ripoll, T. Ramos
An efficient characterization of QND measurements is an important ingredient towards certifying and improving the performance and scalability of quantum processors. In this work, w…
Stochastic optimization algorithms for quantum applications
J. Gidi, B. Candia, A. D. Muñoz-Moller +5
Hybrid classical quantum optimization methods have become an important tool for efficiently solving problems in the current generation of NISQ computers. These methods use an optim…
Complex Field Formulation of the Quantum Estimation Theory
M. Muñoz, L. Pereira, C. Vargas +2
We present a complex field formulation of the quantum estimation theory that works natively with complex statistics on the dependence of complex parameters. This formulation states…
Hardware-efficient entangled measurements for variational quantum algorithms
Francisco Escudero, David Fernández-Fernández, Gabriel Jaumà +2
Variational algorithms have received significant attention in recent years due to their potential to solve practical problems using noisy intermediate-scale quantum (NISQ) devices.…
Certification of a Nonprojective Qudit Measurement using Multiport Beamsplitters
Daniel Martínez, Esteban S. Gómez, Jaime Cariñe +5
Generalised quantum measurements go beyond the textbook concept of a projection onto an orthonormal basis in Hilbert space. They are not only of fundamental relevance but have also…
Training quantum measurement devices to discriminate unknown non-orthogonal quantum states
D. Concha, L. Pereira, L. Zambrano +1
Here, we study the problem of decoding information transmitted through unknown quantum states. We assume that Alice encodes an alphabet into a set of orthogonal quantum states, whi…
Variational determination of multi-qubit geometrical entanglement in NISQ computers
A. D. Muñoz-Moller, L. Pereira, L. Zambrano +2
Current noise levels in physical realizations of qubits and quantum operations limit the applicability of conventional methods to characterize entanglement. In this adverse scenari…
Complete physical characterization of QND measurements via tomography
L. Pereira, J. J. García-Ripoll, T. Ramos
We introduce a self-consistent tomography for arbitrary quantum non-demolition (QND) detectors. Based on this, we build a complete physical characterization of the detector, includ…
Scalable estimation of pure multi-qubit states
L. Pereira, L. Zambrano, A. Delgado
We introduce an inductive -qubit pure-state estimation method. This is based on projective measurements on states of separable bases or entangled bases plus the compu…
High-accuracy adaptive quantum tomography for high-dimensional quantum systems
L. Pereira, D. Martínez, G. Cañas +4
The accuracy of estimating -dimensional quantum states is limited by the Gill-Massar bound. It can be saturated in the qubit () scenario using adaptive standard quantum tom…
Mean-squared-error-based adaptive estimation of pure quantum states and unitary transformations
A. Rojas, L. Pereira, S. Niklitschek +1
In this article we propose a method to estimate with high accuracy pure quantum states of a single qudit. Our method is based on the minimization of the squared error between the c…
Estimation of pure quantum states in high dimension at the limit of quantum accuracy through complex optimization and statistical inference
Leonardo Zambrano, Luciano Pereira, Sebastian Niklitschek +1
Quantum tomography has become a key tool for the assessment of quantum states, processes, and devices. This drives the search for tomographic methods that achieve greater accuracy.…
Estimation of pure states using three measurement bases
L. Zambrano, L. Pereira, D. Martínez +3
We introduce a new method to estimate unknown pure -dimensional quantum states using the probability distributions associated with only three measurement bases. Measurement resu…
Minimum optical depth multiport interferometers for approximating arbitrary unitary operations and pure states
Luciano Pereira, Alejandro Rojas, Gustavo Lima +3
Reconfigurable devices which can implement arbitrary unitary operations are crucial for photonic quantum computation, optical neural networks, and boson sampling. Here, we address…
Multi-core fiber integrated multi-port beamsplitters for quantum information processing
J. Cariñe, G. Cañas, P. Skrzypczyk +10
Multi-port beamsplitters are cornerstone devices for high-dimensional quantum information tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such…