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Autofeedback Scheme for Schrödinger Cat Preservation in Microwave Cavities
Author(s) -
Fortunato M.,
Tombesi P.,
Vitali D.,
Raimond J.M.
Publication year - 2000
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/(sici)1521-3978(200005)48:5/7<431::aid-prop431>3.0.co;2-3
Subject(s) - superposition principle , quantum decoherence , microwave cavity , microwave , limiting , physics , scheme (mathematics) , atom (system on chip) , quantum mechanics , transmission (telecommunications) , rydberg atom , atomic physics , rydberg formula , mathematics , computer science , engineering , mathematical analysis , quantum , telecommunications , ion , mechanical engineering , ionization , embedded system
We propose a feedback scheme for limiting in a significant way the decoherence of a linear superposition of two coherent states with opposite phases in a high‐Q microwave cavity. It is based on the injection of appropriately prepared “probe” and “feedback” Rydberg atoms, and greatly improves the model presented in [D. Vitali et al., Phys. Rev. Lett. 79 , 2442 (1997)]. In the present scheme, the information transmission between the probe and the feedback atom is directly mediated by a second auxiliary cavity, making the detection efficiency for the probe atom no longer a critical parameter. The decoherence time of the superposition state can be significantly increased using presently available technology.