Entanglement between uncoupled modes with time-dependent complex frequency

• URL: http://arxiv.org/abs/2206.14149v1
• Date: Tue, 28 Jun 2022 17:00:28 GMT
• Title: Entanglement between uncoupled modes with time-dependent complex frequency
• Authors: D. Cius, G. M. Uhdre, A. S. M. de Castro, F. M. Andrade
• Abstract summary: We present the general unified description for the unitary time-evolution generated by time-dependent non-Hermitian Hamiltonians. As a direct consequence, we verify that a time-evolved state of uncoupled modes by a time-dependent complex frequency may exhibits a non-zero entanglement.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this work we present the general unified description for the unitary time-evolution generated by time-dependent non-Hermitian Hamiltonians embedding the bosonic representations of $\mathfrak{su}(1,1)$ and $\mathfrak{su}(2)$ Lie algebras. We take into account a time-dependent Hermitian Dyson maps written in terms of the elements of those algebras with the relation between non-Hermitian and its Hermitian counterpart being independent of the algebra realization. As a direct consequence, we verify that a time-evolved state of uncoupled modes modulated by a time-dependent complex frequency may exhibits a non-zero entanglement even when the cross-operators, typical of the interaction between modes, are absent. This is due the non-local nature of the non-trivial dynamical Hilbert space metric encoded in the time-dependent parameters of the general Hermitian Dyson map, which depend on the imaginary part of the complex frequency.

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