Brij Mohan

Louisiana State University, Social Work, Dean/Professor Emeritus

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It has been a privilege to serve academia in various fields of the arts and humanities for about six decades. I have finally reached the goal-- a full-time writer-- that I cherished for a long time. It affords me the tranquility that I needed to focus on issues that confront humankind. My work spans many genres--books, journal articles, editorials, conferences, and Letters to the Editor.

My search for a paradigm that uplifts the human condition amidst the thunders of a new tribal-authoritarianism, confounded by AI, threatens human survival. Civility and citizenship are foundational pillars of a decent democracy, which is endangered by the forces of New Tribalism that I wrote about in Eclipse of Freedom (Mohan, 1993). Freedom From What? Who is afraid of freedom? Scholars, scientists, and intellectuals have a challenging role in rebuilding a broken society.
Supervisors: I search for light and learning everywhere!

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Speed limits on correlations in bipartite quantum systems

arXiv (Cornell University), Jul 12, 2022

Quantum speed limit is bound on the minimum time a quantum system requires to evolve from an init... more Quantum speed limit is bound on the minimum time a quantum system requires to evolve from an initial state to final state under a given dynamical process. It sheds light on how fast a desired state transformation can take place which is pertinent for design and control of quantum technologies. In this paper, we derive speed limits on correlations such as entanglement, Bell-CHSH correlation, and quantum mutual information of quantum systems evolving under dynamical processes. Our main result is speed limit on an entanglement monotone called negativity which holds for arbitrary dimensional bipartite quantum systems and processes. Another entanglement monotone which we consider is the concurrence. To illustrate efficacy of our speed limits, we analytically and numerically compute the speed limits on the negativity, concurrence, and Bell-CHSH correlation for various quantum processes of practical interest. We are able to show that for practical examples we have considered, some of the speed limits we derived are actually attainable and hence these bounds can be considered to be tight.

Brij Mohan

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