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We derive simple practical procedures revealing the quantum behavior of angular momentum variables by the violation of classical upper bounds on the statistics. Data analysis is minimum and definite conclusions are obtained without evaluation of[...]texto impreso
Rivas Vargas, Ángel ; Viyuela García, Óscar ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2013-10-31Thermal noise can destroy topological insulators (TI). However, we demonstrate how TIs can be made stable in dissipative systems. To that aim, we introduce the notion of band Liouvillian as the dissipative counterpart of band Hamiltonian, and sh[...]texto impreso
We derive a master equation that allows us to study non-equilibrium dynamics of a quantum antiferromagnet. By resorting to spin-wave theory, we obtain a closed analytic form for the magnon decay rates. These turn out to be closely related to for[...]texto impreso
Viyuela García, Óscar ; Rivas Vargas, Ángel ; Martín-Delgado Alcántara, Miguel Ángel | IOP Publishing | 2012-03-30We have studied the dynamics of a generalized toric code based on qudits at finite temperature by finding the master equation coupling the code’s degrees of freedom to a thermal bath. We find that in the case of qutrits, new types of anyons and [...]texto impreso
Müller, Markus ; Rivas Vargas, Ángel ; Martínez, E. A. ; Nigg, D. ; Schindler, P. ; Monz, T. ; Blatt, R. ; Martín Delgado, Miguel Ángel | American Physical Society (APS) | 2016-08-24Performing experiments on small-scale quantum computers is certainly a challenging endeavor. Many parameters need to be optimized to achieve high-fidelity operations. This can be done efficiently for operations acting on single qubits, as errors[...]texto impreso
Rivas Vargas, Ángel ; Ruiz Cembranos, José Alberto ; Fernández Sanz, David ; Gutierrez Reyes, Daniel | 2020-06-29Esta documento corresponde a la memoria final de ejecución del proyecto de innovación docente número 216 de la convocatoria 2019/2020 que lleva por título "Métodos Matemáticos de la Física y la Música".texto impreso
We examine the performance of a nonlinear fiber gyroscope for improved signal detection beating the quantum limits of its linear counterparts. The performance is examined when the nonlinear gyroscope is illuminated by practical field states, suc[...]texto impreso
We examine quantum detection via a Michelson interferometer embedded in a gas with Kerr nonlinearity. This nonlinear interferometer is illuminated by pulses of classical light. This strategy combines the robustness against practical imperfection[...]texto impreso
Understanding the role of correlations in quantum systems is both a fundamental challenge as well as of high practical relevance for the control of multi-particle quantum systems. Whereas a lot of research has been devoted to study the various t[...]texto impreso
We develop an SU(2)-invariant approach to the depolarization of quantum systems as the effect of random unitary SU(2) transformations. From it we derive an SU(2)-invariant Markovian master equation. This is applied to several quantum states exam[...]texto impreso
We provide evidence that the uncertainty in detection of small and deterministic phase-shift deviations from a working point can be lower than the Heisenberg bound, for a fixed finite mean number of photons. We achieve that by exploiting nonline[...]texto impreso
Viyuela García, Óscar ; Rivas Vargas, Ángel ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2012-10-23We have studied the dynamical thermal effects on the protected end states of a topological insulator (TI) when it is considered as an open quantum system in interaction with a noisy environment at a certain temperature T . As a result, we find t[...]texto impreso
Viyuela García, Óscar ; Rivas Vargas, Ángel ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2014-08-13We construct a topological invariant that classifies density matrices of symmetry-protected topological orders in two-dimensional fermionic systems. As it is constructed out of the previously introduced Uhlmann phase, we refer to it as the topol[...]
