Multidisciplinary. Archivos - Page 2 Of 18 - Instituto De Física Fundamental

Passive Photonic CZ Gate with Two-Level Emitters in Chiral Multimode Waveguide QED

Marcelo Castellanos2025-04-29T11:12:57+02:00Tags: Applied; Physics, Multidisciplinary. , Quantum Science & Technology; Physics|

Authors: Levy-Yeyati, Tomas; Vega, Carlos; Ramos, Tomas; Gonzalez-Tudela, Alejandro Journal: PRX QUANTUM Publication date: 2025/03/05 DOI: 10.1103/PRXQuantum.6.010342 Abstract: Engineering deterministic photonic gates with simple resources is one of the long-standing challenges in photonic quantum computing. Here, we design a passive conditional gate between copropagating photons using an array of only two-level emitters. The key resource [...]

Minimal orthonormal bases for pure quantum state estimation

Marcelo Castellanos2025-04-28T11:14:37+02:00Tags: Multidisciplinary. , Quantum Science & Technology; Physics|

Authors: Zambrano, Leonardo; Pereira, Luciano; Delgado, Aldo Journal: QUANTUM Publication date: 2024/02/08 DOI: Abstract: 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 insufficient to construct an informationally complete positive operator -valued measurement (ICPOVM) [...]

Avoiding barren plateaus in the variational determination of geometric entanglement

Marcelo Castellanos2025-04-28T11:14:36+02:00Tags: Multidisciplinary. , Quantum Science & Technology; Physics|

Authors: Zambrano, L.; Munoz-Moller, A. D.; Munoz, M.; Pereira, L.; Delgado, A. Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2024/03/28 DOI: 10.1088/2058-9565/ad2a16 Abstract: The barren plateau (BP) phenomenon is one of the main obstacles to implementing variational quantum algorithms in the current generation of quantum processors. Here, we introduce a method capable of avoiding the [...]

Dissipative stabilization of maximal entanglement between nonidentical emitters via two-photon excitation

Marcelo Castellanos2025-04-28T11:14:34+02:00Tags: Multidisciplinary. , Physics|

Authors: Vivas-Viana, Alejandro; Martin-Cano, Diego; Munoz, Carlos Sanchez Journal: PHYSICAL REVIEW RESEARCH Publication date: 2024/10/22 DOI: 10.1103/PhysRevResearch.6.043051 Abstract: Two nonidentical quantum emitters, when placed within a cavity and coherently excited at the two-photon resonance, can reach stationary states of nearly maximal entanglement. In Vivas-Via & ntilde;a, Mart & iacute;n-Cano, and S & aacute;nchez entangled W [...]

Absolute control over the quantum yield of a photodissociation reaction mediated by nonadiabatic couplings

Marcelo Castellanos2025-04-28T11:14:26+02:00Tags: Chemistry, Multidisciplinary. |

Authors: Sola, Ignacio R.; Garcia-Vela, Alberto Journal: CHEMICAL SCIENCE Publication date: 2024/09/25 DOI: 10.1039/d4sc03235g Abstract: Control of molecular reaction dynamics with laser pulses has been developed in the last decades. Among the different magnitudes whose control has been actively pursued, the branching ratio between different product channels constitutes the clearest signature of quantum control. In [...]

Accurate solution of the Index Tracking problem with a hybrid simulated annealing algorithm

Marcelo Castellanos2025-04-28T11:14:23+02:00Tags: Multidisciplinary. , Physics|

Authors: Rubio-Garcia, Alvaro; Fernandez-Lorenzo, Samuel; Garcia-Ripoll, Juan Jose; Porras, Diego Journal: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS Publication date: 2024/04/01 DOI: 10.1016/j.physa.2024.129637 Abstract: An actively managed portfolio almost never beats the market in the long term. Thus, many investors often resort to passively managed portfolios whose aim is to follow a certain financial index. The [...]

Detecting Entanglement from Macroscopic Measurements of the Electric Field and Its Fluctuations

Marcelo Castellanos2025-04-28T11:14:21+02:00Tags: Multidisciplinary. , Physics|

Authors: Rosario, Pedro; Santos, Alan C.; Piovella, Nicola; Kaiser, Robin; Cidrim, Andre; Bachelard, Romain Journal: PHYSICAL REVIEW LETTERS Publication date: 2024/07/31 DOI: 10.1103/PhysRevLett.133.050203 Abstract: To address the outstanding task of detecting entanglement in large quantum systems, entanglement witnesses have emerged, addressing the separable nature of a state. Yet optimizing witnesses, or accessing them experimentally, often [...]

Numerical simulation of large-scale nonlinear open quantum mechanics

Marcelo Castellanos2025-04-28T11:14:20+02:00Tags: Multidisciplinary. , Physics|

Authors: Roda-Llordes, M.; Candoli, D.; Grochowski, P. T.; Riera-Campeny, A.; Agrenius, T.; Garcia-Ripoll, J. J.; Gonzalez-Ballestero, C.; Romero-Isart, O. Journal: PHYSICAL REVIEW RESEARCH Publication date: 2024/03/08 DOI: 10.1103/PhysRevResearch.6.013262 Abstract: We introduce a method to solve nonlinear open quantum dynamics of a particle in situations where its state undergoes significant expansion in phase space while generating [...]

Non-Markovianity in High-Dimensional Open Quantum Systems using Next-generation Multicore Optical Fibers

Marcelo Castellanos2025-04-28T11:14:20+02:00Tags: Multidisciplinary. , Quantum Science & Technology; Physics|

Authors: Rojas-Rojas, Santiago; Martinez, Daniel; Sawada, Kei; Pereira, Luciano; Walborn, Stephen P.; Gomez, Esteban S.; Bernardes, Nadja K.; Lima, Gustavo Journal: QUANTUM Publication date: 2024/08/12 DOI: Abstract: 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 a quantum [...]

Parameter estimation from quantum-jump data using neural networks

Marcelo Castellanos2025-04-28T11:14:19+02:00Tags: Multidisciplinary. , Quantum Science & Technology; Physics|

Authors: Rinaldi, Enrico; Lastre, Manuel Gonzalez; Herreros, Sergio Garcia; Ahmed, Shahnawaz; Khanahmadi, Maryam; Nori, Franco; Munoz, Carlos Sanchez Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2024/07/01 DOI: 10.1088/2058-9565/ad3c68 Abstract: We present an inference method utilizing artificial neural networks for parameter estimation of a quantum probe monitored through a single continuous measurement. Unlike existing approaches focusing [...]