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69 results on '"Iemini, Fernando"'

51. Floquet time crystals in clock models

Author

Surace, Federica Maria, primary, Russomanno, Angelo, additional, Dalmonte, Marcello, additional, Silva, Alessandro, additional, Fazio, Rosario, additional, and Iemini, Fernando, additional

Published
2019
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60. Dissipative topological superconductors in number-conserving systems

Author

Iemini, Fernando, Rossini, Davide, Fazio, Rosario, Diehl, Sebastian, Mazza, Leonardo, Iemini, Fernando, Rossini, Davide, Fazio, Rosario, Diehl, Sebastian, and Mazza, Leonardo

Abstract

We discuss the dissipative preparation of p-wave superconductors in number-conserving one-dimensional fermionic systems. We focus on two setups: the first one entails a single wire coupled to a bath, whereas in the second one the environment is connected to a two-leg ladder. Both settings lead to stationary states which feature the bulk properties of a p-wave superconductor, identified in this number-conserving setting through the long-distance behavior of the proper p-wave correlations. The two schemes differ in the fact that the steady state of the single wire is not characterized by topological order, whereas the two-leg ladder hosts Majorana zero modes, which are decoupled from damping and exponentially localized at the edges. Our analytical results are complemented by a numerical study based both on an exact representation of the density matrix and on a matrix-product-density-operator one. With these tools we characterize the steady-state properties of the protocols, their asymptotic decay rate, and their robustness.

Published
2016

68. Quantifying quantum correlations in fermionic systems using witness operators.

Author

Iemini, Fernando, Maciel, Thiago, Debarba, Tiago, and Vianna, Reinaldo

Subjects
QUANTUM information theory, FERMIONS, STATISTICAL correlation, ROBUST control, PHASE transitions, MATHEMATICAL models, GENERALIZATION
Abstract

We present a method to quantify quantum correlations in arbitrary systems of indistinguishable fermions using witness operators. The method associates the problem of finding the optimal entanglement witness of a state with a class of problems known as semidefinite programs, which can be solved efficiently with arbitrary accuracy. Based on these optimal witnesses, we introduce a measure of quantum correlations which has an interpretation analogous to the Generalized Robustness of entanglement. We also extend the notion of quantum discord to the case of indistinguishable fermions, and propose a geometric quantifier, which is compared to our entanglement measure. Our numerical results show a remarkable equivalence between the proposed Generalized Robustness and the Schliemann concurrence, which are equal for pure states. For mixed states, the Schliemann concurrence presents itself as an upper bound for the Generalized Robustness. The quantum discord is also found to be an upper bound for the entanglement. [ABSTRACT FROM AUTHOR]

Published
2013
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69. Dissipative topological superconductors in number-conserving systems

Author

Fernando Iemini, Davide Rossini, Rosario Fazio, Leonardo Mazza, Sebastian Diehl, Iemini, Fernando, Rossini, Davide, Fazio, Rosario, Diehl, Sebastian, and Mazza, Leonardo

Subjects
Density matrix, FOS: Physical sciences, 01 natural sciences, 010305 fluids & plasmas, Condensed Matter - Strongly Correlated Electrons, Quantum mechanics, 0103 physical sciences, Electronic, Topological order, Optical and Magnetic Materials, 010306 general physics, Superconductivity, Physics, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Quantum Physics, Steady state, Strongly Correlated Electrons (cond-mat.str-el), Zero (complex analysis), OPEN QUANTUM-SYSTEMS, MAJORANA FERMIONS, COMPUTATION, ANYONS, ATOMS, SIMULATIONS, SUPERFLUIDS, DRIVEN, MAJORANA, Quantum Gases (cond-mat.quant-gas), Dissipative system, Condensed Matter - Quantum Gases, Quantum Physics (quant-ph), Stationary state
Abstract

We discuss the dissipative preparation of p-wave superconductors in number-conserving one-dimensional fermionic systems. We focus on two setups: the first one entails a single wire coupled to a bath, whereas in the second one the environment is connected to a two-leg ladder. Both settings lead to stationary states which feature the bulk properties of a p-wave superconductor, identified in this number-conserving setting through the long-distance behavior of the proper p-wave correlations. The two schemes differ in the fact that the steady state of the single wire is not characterized by topological order, whereas the two-leg ladder hosts Majorana zero modes, which are decoupled from damping and exponentially localized at the edges. Our analytical results are complemented by an extensive numerical study of the steady-state properties, of the asymptotic decay rate and of the robustness of the protocols., Comment: 14 pages, 7 figures, 2 appendices

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