Out-of-time-order correlator in the quantum Rabi model

2022-09-19T15:57:15+02:00Tags: , , |

Authors: Kirkova, Aleksandrina, V; Porras, Diego; Ivanov, Peter A. Journal: PHYSICAL REVIEW A Publication date: 2022/03/25 DOI: 10.1103/PhysRevA.105.032444 Abstract: We investigate signatures of chaos and equilibration in the quantum Rabi model, which exhibits a quantum phase transition when the ratio of the atomic level-splitting to bosonic frequency grows to infinity. We show that the out-of-time-order [...]

Quantum Fourier analysis for multivariate functions and applications to a class of Schrodinger-type partial differential equations

2022-09-19T15:57:11+02:00Tags: , , |

Authors: Garcia-Molina, Paula; Rodriguez-Mediavilla, Javier; Jose Garcia-Ripoll, Juan Journal: PHYSICAL REVIEW A Publication date: 2022/01/31 DOI: 10.1103/PhysRevA.105.012433 Abstract: In this work we develop a highly efficient representation of functions and differential operators based on Fourier analysis. Using this representation, we create a variational hybrid quantum algorithm to solve static, Schrodinger-type, Hamiltonian partial differential equations (PDEs), [...]

Non-Gaussian entanglement swapping between three-mode spontaneous parametric down-conversion and three qubits

2022-09-19T15:57:10+02:00Tags: , , |

Authors: Casado, A. Agusti; Sabin, C. Journal: PHYSICAL REVIEW A Publication date: 2022/02/03 DOI: 10.1103/PhysRevA.105.022401 Abstract: In this work we study the production and swapping of non-Gaussian multipartite entanglement in a setup containing a parametric amplifier which generates three photons in different modes coupled to three qubits. We prove that the entanglement generated in this [...]

Gaussian phase sensitivity of boson-sampling-inspired strategies

2022-04-05T17:41:13+02:00Tags: , , |

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 [...]

Topological input-output theory for directional amplification

2022-04-05T17:41:13+02:00Tags: , , |

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 [...]

Engineering analog quantum chemistry Hamiltonians using cold atoms in optical lattices

2022-04-05T17:41:08+02:00Tags: , , |

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 [...]

Qubit motion as a microscopic model for the dynamical Casimir effect

2022-04-05T17:41:05+02:00Tags: , , |

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 [...]

Electron-impact excitation of the (4d(10)5s) S-2(1/2)-> (4d(9)5s(2)) D-2(3/2) and (4d(10)6s) S-2(1/2) ->(4d(10)6s) 2S(1/ 2) transitions in silver: Experiment and theory

2022-04-05T17:41:00+02:00Tags: , , |

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) [...]

Absolute partial ionization cross sections for electron impact of R-carvone from threshold to 100 eV

2022-04-05T17:41:00+02:00Tags: , , |

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 [...]

Positron scattering from pyrazine

2022-04-05T17:40:54+02:00Tags: , , |

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 [...]

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