Suppressing decoherence by preparing the environment

6th International Symposium on Quantum Theory and Symmetries

Landon-Cardinal, Olivier^1,2,3 ; MacKenzie, Richard^2

Département IRO, Université de Montréal, C.P. 6128, Succ. Centreville, Montréal, QC H3C 3J7, Canada^1

Département de Physique, Université de Montréal, C.P. 6128, Succ. Centreville, Montréal, QC H3C 3J7, Canada^2

Département de Physique, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada^3

关键词: Dynamical environment;    Initial state;    Interaction dynamics;    Quantum system;    Self- evolutions;    State preparation;    Tensor products;    Two-state systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/462/1/012033/pdf
DOI  :  10.1088/1742-6596/462/1/012033

来源: IOP

【 摘 要 】

To protect a quantum system from decoherence due to interaction with its environment, we investigate the existence of initial states of the environment allowing for decoherence-free evolution of the system. For a class of models in which a two-state system and a dynamical environment interact through a Hamiltonian restricted to be a tensor product, we prove that such states exist if and only if the interaction and self-evolution Hamiltonians of the environment share an eigenstate. If decoherence by state preparation is not possible, we show that initial states minimizing decoherence result from a delicate compromise between the environment and interaction dynamics.