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Quantum cosmology of the Big Rip: Within GR and in a modified theory of gravity
Bouhmadi López, Mariam
; Albarran, Imanol; Chen, Che-Yu (MDPI, 2017-04-14)
Quantum gravity is the theory that is expected to successfully describe systems that are under strong gravitational effects while at the same time being of an extreme quantum nature. When this principle is applied to the ... -
Quantum crystal structure in the 250-kelvin superconducting lanthanum hydride
Errea Lope, Ion; Belli, Francesco; Monacelli, Lorenzo; Sanna, Antonio; Koretsune, Takashi; Tadano, Terumasa; Bianco, Raffaello; Calandra, Matteo; Arita, Ryotaro; Mauri, Francesco; Flores-Livas, Jose A. (Springer Nature, 2020-02-05)
The discovery of superconductivity at 200 kelvin in the hydrogen sulfide system at high pressures demonstrated the potential of hydrogen-rich materials as high-temperature superconductors. Recent theoretical predictions ... -
Quantum Electrodynamical time-dependent density functional theory
(2017-09-21)The last two decades have witnessed increasing experimental interest in the study and control of many-electron systems strongly interacting with quantum electromagnetic fields. This includes notable experiments in the areas ... -
Quantum Emulation of Gravitational Waves
Fernández-Corbaton, Iván; Cirio, Mauro; Büse, Alexander; Lamata Manuel, Lucas; Solano Villanueva, Enrique Leónidas ; Molina-Terriza, Gabriel (Nature Publishing Group, 2015-07-14)
Gravitational waves, as predicted by Einstein's general relativity theory, appear as ripples in the fabric of spacetime traveling at the speed of light. We prove that the propagation of small amplitude gravitational waves ... -
Quantum Energy Current Induced Coherence in a Spin Chain under Non-Markovian Environments
(MDPI, 2022-10-01)We investigate the time-dependent behaviour of the energy current between a quantum spin chain and its surrounding non-Markovian and finite temperature baths, together with its relationship to the coherence dynamics of the ... -
Quantum entanglement in de Sitter space with a wall and the decoherence of bubble universes
(American Physical Society, 2018-04-30)We study the effect of a bubble wall on the entanglement entropy of a free massive scalar field between two causally disconnected open charts in de Sitter space. We assume there is a delta-functional wall between the open ... -
Quantum extreme learning machine for classification tasks
(2022-10-19)Quantum Computing is one of the most researched areas in computer science and physics, however, current quantum computers are influenced by unwanted noise from environmental factors. Quantum Extreme Learning Machine (QELM) ... -
Quantum Genetic Algorithms: towards the design of evolutionary algorithms in a quantum computer
(2020-12-15)[EN] It contains a review of the fundamental concepts of quantum computation and genetic algorithms. In the last chapter, the first steps towards the development of quantum genetic algorithms are explained. The supplementary ... -
Quantum Illumination Protocols
(2020-01-16)[EN] Quantum Illumination is a novel technique which exploits quantum entanglement as a resource to detect the presence of an object with higher accuracy or smaller number of photons. The applications go from detection of ... -
Quantum illumination reveals phase-shift inducing cloaking
Las Heras García, Urtzi; Di Candia, Roberto; Fedorov, K. G.; Deppe, F.; Sanz Ruiz, Mikel; Solano Villanueva, Enrique Leónidas (Nature Publishing, 2017-08-24)
In quantum illumination entangled light is employed to enhance the detection accuracy of an object when compared with the best classical protocol. On the other hand, cloaking is a stealth technology based on covering a ... -
Quantum interference effects due to spin fields in mesoscopic rings
(2020-01-16)[EN] In this work we study the problem of quantum interference effects in mesoscopic rings due to spin fields. This system is interesting because of the multiple experiments carried out in semiconductor heterostructures ... -
Quantum Machine Learning
(2017-01-10)[EN] In a world in which accessible information grows exponentially, the selection of the appropriate information turns out to be an extremely relevant problem. In this context, the idea of Machine Learning (ML), a subfield ... -
Quantum Many-Body Effects in the Optoelectronic Response of Plasmonic Nanostructures and their Coupling to Quantum Emitters
(2022-11-04)This thesis theoretically addresses the optoelectronic response of metallic nanoparticles (MNPs) as well as their coupling to quantum emitters (QEs). Nanometer-scale systems are considered where optical nonlinearity, ... -
Quantum Measurements and Delays in Scattering by Zero-Range Potentials
(MDPI, 2024-01-16)Eisenbud–Wigner–Smith delay and the Larmor time give different estimates for the duration of a quantum scattering event. The difference is most pronounced in the case where the de Broglie wavelength is large compared to ... -
Quantum Memristors in Frequency-Entangled Optical Fields
González Raya, Tasio; Lukens, Joseph M.; Céleri, Lucas C.; Sanz Ruiz, Mikel (MDPI, 2020-02-14)
A quantum memristor is a passive resistive circuit element with memory, engineered in a given quantum platform. It can be represented by a quantum system coupled to a dissipative environment, in which a system–bath ... -
Quantum Memristors With Superconducting Circuits
Salmilehto, J.; Deppe, F.; Di Ventra, M.; Sanz Ruiz, Mikel; Solano Villanueva, Enrique Leónidas (Nature Publishing Group, 2017-02-14)
Memristors are resistive elements retaining information of their past dynamics. They have garnered substantial interest due to their potential for representing a paradigm change in electronics, information processing and ... -
Quantum neural networks with multi-qubit potentials
(Nature, 2023-06)We propose quantum neural networks that include multi-qubit interactions in the neural potential leading to a reduction of the network depth without losing approximative power. We show that the presence of multi-qubit ... -
Quantum plasmonics: from jellium models to ab initio calculations
(Walter de Gruyter, 2016-08)Light-matter interaction in plasmonic nanostructures is often treated within the realm of classical optics. However, recent experimental findings show the need to go beyond the classical models to explain and predict the ... -
Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime
; ; ; Rico Ortega, Enrique; Solano Villanueva, Enrique Leónidas ; (Nature, 2023-02)
The coupling of a two-level system with an electromagnetic field, whose fully quantized version is the quantum Rabi model, is among the central topics of quantum physics. When the coupling strength becomes large enough ... -
Quantum ricochets: surface capture, release and energy loss of fast ions hitting a polar surface at grazing incidence
(IOP Publishing, 2014-06-09)A diffraction mechanism is proposed for the capture, multiple bouncing and final escape of a fast ion (keV) impinging on the surface of a polarizable material at grazing incidence. Capture and escape are effected by elastic ...