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Quantum Erasure of Decoherence

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Open Systems and Information Dynamics

Abstract

We consider the classical algebra of observables that are diagonal in a given orthonormal basis, and define a complete decoherence process as a completely positive map that asymptotically converts any quantum observable into a diagonal one, while preserving the elements of the classical algebra. For quantum systems in dimension two and three any decoherence process can be undone by collecting classical information from the environment and using such an information to restore the initial system state. As a relevant example, we illustrate the quantum eraser of Scully et al. [Nature 351, 111 (1991)] as an example of environment-assisted correction, and present the generalization of the eraser setup for d-dimensional systems.

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Correspondence to Francesco Buscemi.

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Presented at the 38th Symposium on Mathematical Physics “Quantum Entanglement & Geometry”, Toruń, June 4–7, 2006.

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Buscemi, F., Chiribella, G. & D’Ariano, G.M. Quantum Erasure of Decoherence. Open Syst Inf Dyn 14, 53–61 (2007). https://doi.org/10.1007/s11080-007-9028-4

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