Quantum Delocalized Interactions

Classical mechanics obeys the intuitive logic that a physical event happens at a definite spatial point. Entanglement, however, breaks this logic by enabling interactions without a specific location. In this work we study these delocalized interactions. These are quantum interactions that create less locational information than would be possible classically, as captured by the disturbance induced on some spatial superposition state. We introduce quantum games to capture the effect and demonstrate a direct operational use for quantum concurrence in that it bounds the nonclassical performance gain. We also find a connection with quantum teleportation, and demonstrate the games using an IBM quantum processor

Optimal control with a multidimensional quantum invariant

Optimal quantum control of continuous variable systems poses a formidable computational challenge because of the high-dimensional character of the system dynamics. The framework of quantum invariants can significantly reduce the complexity of such problems, but it requires the knowledge of an invariant compatible with the Hamiltonian of the system in question. We explore the potential of a Gaussian invariant that is suitable for quadratic Hamiltonians with any given number of motional degrees of freedom for quantum optimal control problems that are inspired by current challenges in ground-state-to-ground-state shuttling of trapped-ions.Comment: 9 pages, 4 figure

Control of motional states of trapped ions with quantum invariants

Quantum information processing with trapped ions is a mature field in which single and multiple qubit gates have been demonstrated with exceptionally high process fidelities. As such, there is much interest in designing architectures made up of arrays of ion traps that are able to perform general-purpose quantum computing and manufactured at large scale. These designs require that ions be shuttled throughout such an architecture as quickly as possible while avoiding decoherence of the internal motional states of the ions. Invariant-based inverse engineering has been proposed as a way to obtain such control procedures, with theoretical and experimental demonstrations. In this thesis, I will explore methods that extend the current results of invariant-based inverse engineering to allow for the precise control of motional states of trapped ions in more than one spatial dimension, which has great applicability to the problem of shuttling trapped ions through these architectures. First of all, I introduce a novel quantum invariant corresponding to that of a multidimensional motional state and show how it may be used to obtain experimental controls that realise ion shuttling around a corner, with relevant numerical examples. I then discuss how to extend this framework to the control of more than one ion at a time, with a numerical demonstration of separation of two trapped ions. Finally, I outline a method by which one may be able to characterise numerically the effect of noise and anharmonicities in trapping potentials on the motional states of trapped ions.Open Acces

Optimal control with a multidimensional quantum invariant

Optimal quantum control of continuous variable systems poses a formidable computational challenge because of the high-dimensional character of the system dynamics. The framework of quantum invariants can significantly reduce the complexity of such problems, but it requires the knowledge of an invariant compatible with the Hamiltonian of the system in question. We explore the potential of a Gaussian invariant that is suitable for quadratic Hamiltonians with any given number of motional degrees of freedom for quantum optimal control problems that are inspired by current challenges in ground-state to ground-state shuttling of trapped ions

Academic Domains As Political Battlegrounds: A Global Enquiry By 99 Academics in The Fields of Education and Technology

This article theorizes the functional relationship between the human components (i.e., scholars) and non-human components (i.e., structural configurations) of academic domains. It is organized around the following question: in what ways have scholars formed and been formed by the structural configurations of their academic domain? The article uses as a case study the academic domain of education and technology to examine this question. Its authorship approach is innovative, with a worldwide collection of academics (99 authors) collaborating to address the proposed question based on their reflections on daily social and academic practices. This collaboration followed a three-round process of contributions via email. Analysis of these scholars' reflective accounts was carried out, and a theoretical proposition was established from this analysis. The proposition is of a mutual (yet not necessarily balanced) power (and therefore political) relationship between the human and non-human constituents of an academic realm, with the two shaping one another. One implication of this proposition is that these non-human elements exist as political actors', just like their human counterparts, having agency' - which they exercise over humans. This turns academic domains into political (functional or dysfunctional) battlefields' wherein both humans and non-humans engage in political activities and actions that form the identity of the academic domain. For more information about the authorship approach, please see Al Lily AEA (2015) A crowd-authoring project on the scholarship of educational technology. Information Development. doi: 10.1177/0266666915622044.Wo