Authors: Bello, M.; Platero, G.; Gonzalez-Tudela, A. Journal: PRX QUANTUM Publication date: 2022/03/07 DOI: 10.1103/PRXQuantum.3.010336 Abstract: Waveguide QED has emerged as a powerful analog quantum simulator due to the possibility of mediating versatile spin-spin interactions with tunable sign, range, and even dimerization. Yet, despite their potential, the many-body phases emerging from these systems have only [...]
Authors: Pereira, Luciano; Zambrano, Leonardo; Delgado, Aldo Journal: NPJ QUANTUM INFORMATION Publication date: 2022/05/13 DOI: 10.1038/s41534-022-00565-9 Abstract: We introduce an inductive n-qubit pure-state estimation method based on projective measurements on mn + 1 separable bases or m entangled bases plus the computational basis, with m >= 2. The method exhibits a favorable scaling in the [...]
Authors: Garbe, Louis; Abah, Obinna; Felicetti, Simone; Puebla, Ricardo Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2022/06/15 DOI: 10.1088/2058-9565/ac6ca5 Abstract: Phase transitions represent a compelling tool for classical and quantum sensing applications. It has been demonstrated that quantum sensors can in principle saturate the Heisenberg scaling, the ultimate precision bound allowed by quantum mechanics, in [...]
Authors: Munuera-Javaloy, C.; Puebla, R.; D'Anjou, B.; Plenio, M. B.; Casanova, J. Journal: NPJ QUANTUM INFORMATION Publication date: 2022/11/30 DOI: 10.1038/s41534-022-00653-w Abstract: We present a protocol that detects molecular conformational changes with two nitroxide electron-spin labels and a nitrogen-vacancy (NV) center in diamond. More specifically, we demonstrate that the NV can detect energy shifts induced [...]
Authors: Sharafiev, Aleksei; Juan, Mathieu L.; Gargiulo, Oscar; Zanner, Maximilian; Woegerer, Stephanie; Garcia-Ripoll, Juan Jose; Kirchmair, Gerhard Journal: QUANTUM Publication date: 2021/06/10 DOI: 10.22331/q-2021-06-10-474 Abstract: At the dawn of Quantum Physics, Wigner and Weisskopf obtained a full analytical description (a photon portrait) of the emission of a single photon by a twolevel system, using the [...]
Authors: Schmidt, M. K.; Esteban, R.; Giedke, G.; Aizpurua, J.; Gonzalez-Tudela, A. Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2021/07/01 DOI: 10.1088/2058-9565/abe569 Abstract: Frequency-resolved photon correlations have proven to be a useful resource to unveil nonlinearities hidden in standard observables such as the spectrum or the standard (color-blind) photon correlations. In this manuscript, we analyze [...]
Authors: Fernandez-Lorenzo, Samuel; Porras, Diego; Garcia-Ripoll, Juan Jose Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2021/07/01 DOI: 10.1088/2058-9565/abf9af Abstract: In this work we develop tools to address combinatorial optimization problems with a cardinality constraint, in which only a subset of variables end up having nonzero values. Firstly, we introduce a new heuristic pruning method that [...]
Authors: Altares-Lopez, Sergio; Ribeiro, Angela; Garcia-Ripoll, Juan Jose Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2021/10/01 DOI: 10.1088/2058-9565/ac1ab1 Abstract: We propose a new technique for the automatic generation of optimal ad-hoc ansatze for classification by using quantum support vector machine. This efficient method is based on non-sorted genetic algorithm II multiobjective genetic algorithms which allow [...]
Authors: Berrocal, Joaquin; Lohse, Steffen; Dominguez, Francisco; Gutierrez, Manuel J.; Fernandez, Francisco J.; Block, Michael; Garcia-Ripoll, Juan J.; Rodriguez, Daniel Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2021/10/01 DOI: 10.1088/2058-9565/ac01bc Abstract: The coherent coupling between a quartz electro-mechanical resonator at room temperature and trapped ions in a 7 T Penning trap has been demonstrated for [...]
Authors: Schmidt, M. K.; Esteban, R.; Giedke, G.; Aizpurua, J.; Gonzalez-Tudela, A. Journal: QUANTUM SCIENCE AND TECHNOLOGY Publication date: 2021/06/11 DOI: 10.1088/2058-9565/abe569 Abstract: Frequency-resolved photon correlations have proven to be a useful resource to unveil nonlinearities hidden in standard observables such as the spectrum or the standard (color-blind) photon correlations. In this manuscript, we analyze [...]
