Gaussian Quantum Marginal Problem

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Authors	EISERT Jens TYC Tomáš RUDOLPH Terry SANDERS Barry
Year of publication	2008
Type	Article in Periodical
Magazine / Source	Communications in Mathematical Physics
MU Faculty or unit	Faculty of Science
Citation
Web	http://www.springerlink.com/content/02808238l052xg78/
Field	Theoretical physics
Keywords	Gaussian states; symplectic eigenvalues; density matrix;
Description	The quantum marginal problem asks what local spectra are consistent with a given spectrum of a joint state of a composite quantum system. We solve this problem for Gaussian states for any number of modes, for both pure and mixed states, and formulate the solution in terms of a set of necessary and sufficient conditions. Our result determines what local temperatures or entropies are consistent with a pure or mixed Gaussian state of several modes.
Related projects:	Highly Parallel and Distributed Computing Systems Mathematical structures and their physical applications