Optical isolators based on nonreciprocal four-wave mixing

2023-02-21T13:39:30+01:00Tags: , , |

Authors: Muñoz de las Heras, A.; Carusotto, I. Journal: PHYSICAL REVIEW A Publication date: 2022/12/29 DOI: 10.1103/PhysRevA.106.063523 Abstract: In this work we propose and theoretically characterize optical isolators consisting of an all-dielectric and nonmagnetic resonator featuring an intensity-dependent refractive index and a strong coherent field propagating in a single direction. Such devices can be straightforwardly [...]

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

2023-02-21T13:37:18+01:00Tags: , , |

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

2023-02-21T13:37:15+01:00Tags: , , |

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 [...]

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

2023-02-21T13:37:02+01:00Tags: , , |

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 [...]

Decimation technique for open quantum systems: A case study with driven-dissipative bosonic chains

2023-02-21T13:36:50+01:00Tags: , , |

Authors: Gomez-Leon, Alvaro; Ramos, Tomas; Porras, Diego; Gonzalez-Tudela, Alejandro Journal: PHYSICAL REVIEW A Publication date: 2022/05/26 DOI: 10.1103/PhysRevA.105.052223 Abstract: The unavoidable coupling of quantum systems to external degrees of freedom leads to dissipative (nonunitary) dynamics, which can be radically different from closed-system scenarios. Such open quantum system dynamics is generally described by Lindblad master equations, [...]

Exceptional spectral phase in a dissipative collective spin model

2023-02-21T13:36:42+01:00Tags: , , |

Authors: Rubio-Garcia, Alvaro; Corps, Angel L.; Relano, Armando; Molina, Rafael A.; Perez-Bernal, Francisco; Enrique Garcia-Ramos, Jose; Dukelsky, Jorge Journal: PHYSICAL REVIEW A Publication date: 2022/07/07 DOI: 10.1103/PhysRevA.106.L010201 Abstract: We study a model of a quantum collective spin weakly coupled to a spin-polarized Markovian environment and find that the spectrum is divided into two regions that [...]

Unconventional mechanism of virtual-state population through dissipation

2023-02-21T13:36:32+01:00Tags: , , |

Authors: Vivas-Viana, Alejandro; Gonzalez-Tudela, Alejandro; Sanchez Munoz, Carlos Journal: PHYSICAL REVIEW A Publication date: 2022/07/22 DOI: 10.1103/PhysRevA.106.012217 Abstract: Virtual states are a central concept in quantum mechanics. By definition, the probability of finding a quantum system in a virtual state should be vanishingly small at all times. In contrast to this notion, we report a [...]

Bridging the gap between topological non-Hermitian physics and open quantum systems

2023-02-21T13:36:31+01:00Tags: , , |

Authors: Gomez-Leon, Alvaro; Ramos, Tomas; Gonzalez-Tudela, Alejandro; Porras, Diego Journal: PHYSICAL REVIEW A Publication date: 2022/07/25 DOI: 10.1103/PhysRevA.106.L011501 Abstract: We relate observables in open quantum systems with the topology of non-Hermitian models using the Keldysh path-integral method. This allows to extract an effective Hamiltonian from the Green's function which contains all the relevant topological information [...]

Multiqudit interactions in molecular spins

2023-02-21T13:36:27+01:00Tags: , , |

Authors: Gomez-Leon, Alvaro Journal: PHYSICAL REVIEW A Publication date: 2022/08/15 DOI: 10.1103/PhysRevA.106.022609 Abstract: We study photon-mediated interactions between molecular spin qudits in the dispersive regime of operation. We derive from a microscopic model the effective interaction between molecular spins, including their crystal field anisotropy (i.e., the presence of nonlinear spin terms) and their multilevel structure. [...]

Mass spectra and appearance energies of cationic fragments for electron ionization of 2-butanol

2023-02-21T13:36:13+01:00Tags: , , |

Authors: Amorim, R. A. A.; Diniz, A. C.; Oliveira, C. B.; Oliveira Junior, O. L.; Jones, D. B.; Blanco, F.; Garcia, G.; Brunger, M. J.; Lopes, M. C. A. Journal: EUROPEAN PHYSICAL JOURNAL D Publication date: 2022/11/01 DOI: 10.1140/epjd/s10053-022-00537-w Abstract: In this work, the mass spectrum (MS) and the appearance energies (AEs) of the ionic [...]

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