Condensed Matter. Archivos - Instituto De Física Fundamental

Parallel tomography of quantum non-demolition measurements in multi-qubit devices

Marcelo Castellanos2024-03-27T13:58:19+01:00Tags: Applied; Physics, Atomic, Condensed Matter. , Molecular & Chemical; Physics, Quantum Science & Technology; Physics|

Authors: Pereira, L.; Garcia-Ripoll, J. J.; Ramos, T. Journal: NPJ QUANTUM INFORMATION Publication date: 2023/03/04 DOI: 10.1038/s41534-023-00688-7 Abstract: An efficient characterization of QND measurements is an important ingredient toward certifying and improving the performance and scalability of quantum processors. In this work, we introduce a parallel tomography of QND measurements that addresses single- and two-qubit [...]

Atom scattering as a probe of the surface electron-phonon interaction at conducting surfaces

Marcelo Castellanos2023-02-21T13:36:57+01:00Tags: Chemistry, Condensed Matter. , Physical; Physics|

Authors: Manson, J. R.; Benedek, G.; Miret-Artes, Salvador Journal: SURFACE SCIENCE REPORTS Publication date: 2022/05/01 DOI: 10.1016/j.surfrep.2022.100552 Abstract: An atomic projectile colliding with a surface at kinetic energies in the thermal or hyperthermal range interacts with and is reflected by the electronic density well in front of the first layer of target atoms, and it [...]

Quenches to the critical point of the three-state Potts model: Matrix product state simulations and conformal field theory

Marcelo Castellanos2023-02-21T13:36:56+01:00Tags: Applied; Physics, Condensed Matter. , Materials Science, Multidisciplinary; Physics|

Authors: Robertson, Niall F.; Surace, Jacopo; Tagliacozzo, Luca Journal: PHYSICAL REVIEW B Publication date: 2022/05/04 DOI: 10.1103/PhysRevB.105.195103 Abstract: Conformal field theories (CFTs) have been used extensively to understand the physics of critical lattice models at equilibrium. However, the applicability of CFT calculations to the behavior of the lattice systems in the out-of-equilibrium setting is not [...]

Scalable estimation of pure multi-qubit states

Marcelo Castellanos2023-02-21T13:36:54+01:00Tags: Applied; Physics, Atomic, Condensed Matter. , Molecular & Chemical; Physics, Quantum Science & Technology; Physics|

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 [...]

Role of boundary conditions in the full counting statistics of topological defects after crossing a continuous phase transition

Marcelo Castellanos2023-02-21T13:36:21+01:00Tags: Applied; Physics, Condensed Matter. , Materials Science, Multidisciplinary; Physics|

Authors: Gomez-Ruiz, Fernando J.; Subires, David; del Campo, Adolfo Journal: PHYSICAL REVIEW B Publication date: 2022/10/10 DOI: 10.1103/PhysRevB.106.134302 Abstract: In a scenario of spontaneous symmetry breaking in finite time, topological defects are generated at a density that scales with the driving time according to the Kibble-Zurek mechanism (KZM). Signatures of universality beyond the KZM have [...]

Locality of spontaneous symmetry breaking and universal spacing distribution of topological defects formed across a phase transition

Marcelo Castellanos2023-02-21T13:36:16+01:00Tags: Applied; Physics, Condensed Matter. , Materials Science, Multidisciplinary; Physics|

Authors: del Campo, Adolfo; Javier Gomez-Ruiz, Fernando; Zhang, Hai-Qing Journal: PHYSICAL REVIEW B Publication date: 2022/10/11 DOI: 10.1103/PhysRevB.106.L140101 Abstract: The crossing of a continuous phase transition results in the formation of topological defects with a density predicted by the Kibble-Zurek mechanism (KZM). We characterize the spatial distribution of pointlike topological defects in the resulting nonequilibrium [...]

Detection of molecular transitions with nitrogen-vacancy centers and electron-spin labels

Marcelo Castellanos2023-02-21T13:36:07+01:00Tags: Applied; Physics, Atomic, Condensed Matter. , Molecular & Chemical; Physics, Quantum Science & Technology; Physics|

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 [...]

Gigahertz Frame Rate Imaging of Charge-Injection Dynamics in a Molecular Light Source

Marcelo Castellanos2022-04-05T17:41:05+02:00Tags: Applied; Physics, Chemistry, Condensed Matter. , Multidisciplinary; Chemistry, Multidisciplinary; Physics, Physical; Nanoscience & Nanotechnology; Materials Science|

Authors: Roslawska, Anna; Merino, Pablo; Leon, Christopher C.; Grewal, Abhishek; Etzkorn, Markus; Kuhnke, Klaus; Kern, Klaus Journal: NANO LETTERS Publication date: 2021/06/09 DOI: 10.1021/acs.nanolett.1c00328 Abstract: Light sources on the scale of single molecules can be addressed and characterized at their proper sub-nanometer scale by scanning tunneling microscopy-induced luminescence (STML). Such a source can be driven [...]

Atomic-Scale Structural Fluctuations of a Plasmonic Cavity

Marcelo Castellanos2022-04-05T17:40:59+02:00Tags: Applied; Physics, Chemistry, Condensed Matter. , Multidisciplinary; Chemistry, Multidisciplinary; Physics, Physical; Nanoscience & Nanotechnology; Materials Science|

Authors: Roslawska, Anna; Merino, Pablo; Grewal, Abhishek; Leon, Christopher C.; Kuhnke, Klaus; Kern, Klaus Journal: NANO LETTERS Publication date: 2021/09/08 DOI: 10.1021/acs.nanolett.1c02207 Abstract: Optical spectromicroscopies, which can reach atomic resolution due to plasmonic enhancement, are perturbed by spontaneous intensity modifications. Here, we study such fluctuations in plasmonic electroluminescence at the single-atom limit profiting from the [...]

Photon-Mediated Interactions near a Dirac Photonic Crystal Slab

Marcelo Castellanos2021-11-17T20:21:00+01:00Tags: Applied; Physics, Condensed Matter. , Multidisciplinary; Optics; Physics, Nanoscience & Nanotechnology; Materials Science|

Authors: Petrovish Navarro-Baron, Erik; Vinck-Posada, Herbert; Gonzalez-Tudela, Alejandro Journal: ACS PHOTONICS Publication date: 2021/11/17 DOI: 10.1021/acsphotonics.1c00991 Abstract: Dirac energy dispersions are responsible for the extraordinary transport properties of graphene. This motivated the quest for engineering such energy dispersions also in photonics, where they have been predicted to lead to many exciting phenomena. One paradigmatic example [...]