Remark on multi-particle observables and entangled states with constant complexity

Details Remark on multi-particle observables and entangled states with constant complexity Remark on multi-particle observables and entangled states with constant complexity

2000-03-24

arxiv.org/abs/quant-ph/0003117v1

Physics

Quantum Physics

7 pages, Revtex

Scientific paper

We show that every density matrix of an n-particle system prepared by a quantum network of constant depth is asymptotically commuting with the mean-field observables. We introduce certain pairs of hypersurfaces in the space of density matrices and give lower bounds for the depth of a network which prepares states lying outside those pairs. The measurement of an observable which is not asymptotically commuting with the mean-field observables requires a network of depth in the order of log n, if one demands the measurement to project the state into the eigenspace of the measured observable.

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