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Effects of disorder on nonclassicality in many-body systems

Debasis Sadhukhan

Harish-Chandra Research Institute, Allahabad, India
en collaboration avec les séminaires de la matière quantique

Quantum correlations have been shown to be useful resources for a variety of quantum information and computational tasks. Many-body systems constitute a natural ground for the physical realization of such quantum information protocols. However, pure quantum systems are very rare in nature due to decoherence, thermal fluctuations, impurities, etc. Thus, disordered systems form one of the center stages of studies in many-body physics and often lead to counterintuitive yet appealing physical phenomena such as many-body localization, disorder-induced order, etc. From a quantum information theoretic perspective, I will discuss several interesting phenomena in the realm of quenched disorder which include enhancement of quantum correlation length, overcoming no-go theorems, and enhanced disorder-induced order of entanglement under thermal fluctuations. In a similar spirit, inhomogeneity also leads to generation of new phases in the system. Introduction of an alternating chemical potential in an 1D Fermi gas on a lattice develops a new phase compared to the same system with uniform chemical potential which can be characterized by quantum correlations present in the system. I will also talk about the trends of quantum correlations in such system, under closed and open dynamics. Finally, I will show that bipartite entanglement can be frozen over time with a proper choice of the many-body substrate, which is in contact with the environment via a repetitive interaction.


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