Classifying the non-time-local and entangling dynamics of an open qubit system

Journal of High Energy Physics

Regular Article - Theoretical Physics

Sean Prudhoe¹  Sarah Shandera¹ 

[1] Institute for Gravitation and the Cosmos, The Pennsylvania State University, 321 Whitmore, University Park, PA, USA;Department of Physics, The Pennsylvania State University, 104 Davey, University Park, PA, USA;

关键词: Cosmological models;    Effective Field Theories;    Nonperturbative Effects;   

DOI  :  10.1007/JHEP02(2023)007

 received in 2022-12-20, accepted in 2023-01-10,  发布年份 2023

来源: Springer

【 摘 要 】

We study families of dynamical maps generated from interactions with varying degrees of symmetry. For a family of time-independent Hamiltonians, we demonstrate the relationship between symmetry, strong-coupling, perfect entanglers, non-Markovian features, and non-time-locality. We show that by perturbing the initial environment state, effective time-local descriptions can be obtained that are non-singular yet capture essential non-unitary features of the reduced dynamics. We then consider a time-dependent Hamiltonian that changes the degree of symmetry by activating a dormant degree of freedom. In this example we find that the one-qubit reduced dynamics changes dramatically. These results can inform the construction of effective theories of open systems when the larger system dynamics is unknown.

【 授权许可】

Unknown   
© The Author(s) 2023