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- W3123255275 abstract "We study the dynamics of two level systems described by non-hermitian Hamiltonians with real eigenvalues. Within the framework of hermitian quantum mechanics, it is known that maximal violation of Leggett-Garg inequality is bounded by $3/2$ (Luder's bound). We show that this absolute bound can be evaded when dynamics is governed by non-hermitian Hamiltonians. Moreover, the extent of violation can be optimized to reach its algebraic maximum of $3$ which is otherwise only feasible when the Hilbert space is infinite dimensional in the hermitian case. The extreme violation of Leggett-Garg inequality is shown to be directly related to the two basic ingredients: (i) The Bloch equation for the two level system has non-linear terms which allow for accelerated dynamics of states on the Bloch sphere exceeding all known quantum speed limits of state evolution; and (ii) We need to ensure that the quantum trajectory of states always lies on a single great circle (geodesic path) on the Bloch sphere at all times." @default.
- W3123255275 created "2021-02-01" @default.
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- W3123255275 date "2021-02-24" @default.
- W3123255275 modified "2023-10-17" @default.
- W3123255275 title "Temporal correlation beyond quantum bounds in non-Hermitian PT- symmetric dynamics of a two level system" @default.
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- W3123255275 doi "https://doi.org/10.1088/1751-8121/abde76" @default.
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