A Subsystem-Independent Generalization of Entanglement

@article{citeulike:1081797, abstract = {We present a generalization of entanglement based on the idea that entanglement is relative to a distinguished subspace of observables rather than a distinguished subsystem decomposition. A pure quantum state is entangled relative to such a subspace if its expectations are a proper mixture of those of other states. Many information-theoretic aspects of entanglement can be extended to this observablebased setting, suggesting new ways of measuring and classifying multipartite entanglement. By going beyond the distinguishable-subsystem framework, generalized entanglement also provides novel tools for probing quantum correlations in interacting many-body systems.}, author = {Barnum, H. and Knill, E. and Ortiz, G. and Somma, R. and Viola, L. }, citeulike-article-id = {1081797}, comment = {Listed by author as "significant." [2]}, journal = {Physical Review Letters}, keywords = {measure, subsystem}, month = {March}, number = {10}, posted-at = {2007-02-01 08:57:15}, priority = {0}, title = {A Subsystem-Independent Generalization of Entanglement}, volume = {92}, year = {2004} }

TY - JOUR ID - citeulike:1081797 L3 - citeulike-article-id:1081797 TI - A Subsystem-Independent Generalization of Entanglement JF - Physical Review Letters VL - 92 IS - 10 N2 - We present a generalization of entanglement based on the idea that entanglement is relative to a distinguished subspace of observables rather than a distinguished subsystem decomposition. A pure quantum state is entangled relative to such a subspace if its expectations are a proper mixture of those of other states. Many information-theoretic aspects of entanglement can be extended to this observablebased setting, suggesting new ways of measuring and classifying multipartite entanglement. By going beyond the distinguishable-subsystem framework, generalized entanglement also provides novel tools for probing quantum correlations in interacting many-body systems. KW - measure KW - subsystem N1 - Listed by author as "significant." [2] AU - Barnum, H AU - Knill, E AU - Ortiz, G AU - Somma, R AU - Viola, L PY - 2004/03/12/ ER -