Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum Effects (Entanglement and Decoherence)
Q 66.7: Talk
Friday, March 9, 2018, 12:00–12:15, K 1.013
Entanglement among degrees of freedom of a composite quasiparticle scattering by an impurity on a lattice — •Fumika Suzuki1, Marina Litinskaya2, and William G. Unruh1 — 1Department of Physics, University of British Columbia, Vancouver, V6T 1Z1, Canada — 2Department of Chemistry, University of British Columbia, Vancouver, V6T 1Z1, Canada
We study scattering of a composite quasiparticle, which possesses a degree of freedom corresponding to relative separation between two bound particles, by a delta-like impurity potential on a one-dimensional discrete lattice. Different from a composite object in continuum space, for a composite quasiparticle on a discrete lattice, the entanglement between its relative and centre of mass coordinate degrees of freedom arises naturally due to inseparability of the two-particle Hamiltonian. One of the main focuses of our study is to investigate how this inseparability or the entanglement among degrees of freedom of the composite quasiparticle affects the way how it interacts with an external object such as an impurity. We also report the existence of excitation-impurity bound states whose energies are located in the continuum band. Finally, we discuss a change in the entanglement of a composite quasiparticle wave packet during a single impurity scattering and the decoherence effect on the interference pattern created by it.
Ref: F. Suzuki, M. Litinskaya and W. G. Unruh, Phys. Rev. B. 96, 054307 (2017).