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

Sean Prudhoe, Sarah Shandera

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number7
JournalJournal of High Energy Physics
Issue number2
StatePublished - Feb 2023

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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