Entanglement and the speed of evolution of two interacting qubits
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Date
Authors
Zander, Claudia
Borras, A.
Plastino, Angel Ricardo (Angelo)
Casas, Montserrat
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Physics
Abstract
The time needed by a quantum system to reach a state fully distinguishable from the original
one provides a natural way of determining how fast the corresponding dynamical evolution is. This
orthogonality time admits a lower bound, expressible in terms of the energy’s expectation value
and the energy’s standard deviation, that yields a “quantum speed limit”. Composite quantum
systems need entanglement in order to achieve this limit. So far, most studies on the connection
between entanglement and the quantum speed limit have focused on the case of non-interacting
systems. The connection between quantum speed and entanglement is systematically investigated
here for the case of a system of two interacting qubits, taking into consideration all possible initial
states that evolve into an orthogonal one.
Description
Keywords
Quantum entanglement, Quantum evolution, Time-energy uncertainty relations
Sustainable Development Goals
Citation
Zander, C, Borras, A, Plastino, AR, Plastino, A & Casas, M 2013, 'Entanglement and the speed of evolution of two interacting qubits', Journal of Physics A- Mathematical and Theoretical, vol. 46, no. 9, pp. 1-19.