Authors: Ramos, Tomas; Jose Garcia-Ripoll, Juan; Porras, Diego Journal: PHYSICAL REVIEW A Publication date: 2021/03/18 DOI: 10.1103/PhysRevA.103.033513 Abstract: We present a topological approach to the input-output relations of photonic driven-dissipative systems acting as directional amplifiers. Our theory relies on a mapping from the optical non-Hermitian coupling matrix to an effective topological insulator Hamiltonian. This mapping [...]

Authors: Valido, Antonio A.; Jose Garcia-Ripoll, Juan Journal: PHYSICAL REVIEW A Publication date: 2021/03/24 DOI: 10.1103/PhysRevA.103.032613 Abstract: In this paper we study the phase sensitivity of generic linear interferometric schemes using Gaussian resources and measurements. Our formalism is based on the Fisher information. This allows us to separate the contributions of the measurement scheme, the [...]

Authors: Arguello-Luengo, Javier; Shi, Tao; Gonzalez-Tudela, Alejandro Journal: PHYSICAL REVIEW A Publication date: 2021/04/14 DOI: 10.1103/PhysRevA.103.043318 Abstract: Using quantum systems to efficiently solve quantum chemistry problems is one of the long-sought applications of near-future quantum technologies. In a recent work [J. Arguello-Luengo et al., Nature (London) 574, 215 (2019)], ultracold fermionic atoms have been proposed [...]

Authors: Agusti, A.; Garcia-Alvarez, L.; Solano, E.; Sabin, C. Journal: PHYSICAL REVIEW A Publication date: 2021/06/01 DOI: 10.1103/PhysRevA.103.062201 Abstract: The generation of photons from the vacuum by means of the movement of a mirror is known as the dynamical Casimir effect (DCE). In general, this phenomenon is effectively described by a field with time-dependent boundary [...]

Authors: Marinkovic, B. P.; Tosic, S. D.; Sevic, D.; McEachran, R. P.; Blanco, F.; Garcia, G.; Brunger, M. J. Journal: PHYSICAL REVIEW A Publication date: 2021/08/10 DOI: 10.1103/PhysRevA.104.022808 Abstract: We present angle-differential and angle-integrated cross sections for electron-impact excitation of the (4d(10)5s) S-2(1/ 2) -> (4d(9)5s(2)) D-2(3/ 2) and (4d(10)5s) S-2(1/ 2) ->(4d(10)6s) S-2(1/ 2) [...]

Authors: Amorim, R. A. A.; Pires, W. A. D.; Fernandes, A. C. P.; Casagrande, T. M.; Jones, D. B.; Blanco, F.; Garcia, G.; Brunger, M. J.; Lopes, M. C. A. Journal: EUROPEAN PHYSICAL JOURNAL D Publication date: 2021/08/01 DOI: 10.1140/epjd/s10053-021-00225-1 Abstract: Partial ionization cross section (PICS) measurements, of the cations created through electron ionization from [...]

Authors: Edwards, D.; Stevens, D.; Cheong, Z.; Graves, V; Gorfinkiel, J. D.; Blanco, F.; Garcia, G.; Brunger, M. J.; White, R. D.; Sullivan, J. P. Journal: PHYSICAL REVIEW A Publication date: 2021/10/12 DOI: 10.1103/PhysRevA.104.042807 Abstract: The present paper provides a joint experimental and theoretical study of positron scattering from pyrazine. Experimental data were measured employing [...]

Authors: Garcia-Elcano, Inaki; Bravo-Abad, Jorge; Gonzalez-Tudela, Alejandro Journal: PHYSICAL REVIEW A Publication date: 2021/03/17 DOI: 10.1103/PhysRevA.103.033511 Abstract: Weyl photons appear when two three-dimensional photonic bands with linear dispersion are degenerate at a single momentum point, labeled as Weyl point. These points have remarkable properties such as being robust topological monopoles of Berry curvature as well [...]

Authors: Diez-Valle, Pablo; Porras, Diego; Garcia-Ripoll, Juan Jose Journal: PHYSICAL REVIEW A Publication date: 2021/12/16 DOI: 10.1103/PhysRevA.104.062426 Abstract: Quantum variational optimization has been posed as an alternative to solve optimization problems faster and at a larger scale than what classical methods allow. In this paper we study systematically the role of entanglement, the structure of [...]