Gaussian quantum resource theories

Lami, Ludovico; Regula, Bartosz; Wang, Xin; Nichols, Rosanna; Winter, Andreas; Adesso, Gerardo

Abstract

We develop a general framework to assess capabilities and limitations of the Gaussian toolbox in continuous-variable quantum information theory. Our framework allows us to characterize the structure and properties of quantum resource theories specialized to Gaussian states and Gaussian operations, establishing rigorous methods for their description and yielding a unified approach to their quantification. We show in particular that, under a few intuitive and physically motivated assumptions on the set of free states, no Gaussian quantum resource can be distilled with free Gaussian operations, even when an unlimited supply of the resource state is available. This places fundamental constraints on state manipulations in all such Gaussian resource theories. We discuss in particular the applications to quantum entanglement, where we extend previously known results by showing that Gaussian entanglement cannot be distilled even with Gaussian operations preserving the positivity of the partial transpose, as well as to other Gaussian resources such as steering and optical nonclassicality. A comprehensive semidefinite programming representation of all these resources is explicitly provided.

Citation

Lami, L., Regula, B., Wang, X., Nichols, R., Winter, A., & Adesso, G. (2018). Gaussian quantum resource theories. Physical Review A, 98(2), Article 022335. https://doi.org/10.1103/physreva.98.022335

• Journal Article Type: Article
• Acceptance Date: Aug 1, 2018
• Online Publication Date: Aug 31, 2018
• Publication Date: Aug 31, 2018
• Deposit Date: Sep 6, 2018
• Publicly Available Date: Sep 6, 2018
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 98
• Issue: 2
• Article Number: 022335
• DOI: https://doi.org/10.1103/physreva.98.022335
• Public URL: https://nottingham-repository.worktribe.com/output/1062723
• Contract Date: Sep 6, 2018