



01270nas a2200157   4500008004100000245006000041210006000101260001500161300001600176490000700192520080600199100002301005700002201028700001801050856004401068       2004                        eng d00aReversible simulation of bipartite product Hamiltonians0 aReversible simulation of bipartite product Hamiltonians  c2004/06/01  a1189 - 11970 v503 a  Consider two quantum systems A and B interacting according to a product
Hamiltonian H = H_A x H_B. We show that any two such Hamiltonians can be used
to simulate each other reversibly (i.e., without efficiency losses) with the
help of local unitary operations and local ancillas. Accordingly, all non-local
features of a product Hamiltonian -- including the rate at which it can be used
to produce entanglement, transmit classical or quantum information, or simulate
other Hamiltonians -- depend only upon a single parameter. We identify this
parameter and use it to obtain an explicit expression for the entanglement
capacity of all product Hamiltonians. Finally, we show how the notion of
simulation leads to a natural formulation of measures of the strength of a
nonlocal Hamiltonian.
1 aChilds, Andrew, M.1 aLeung, Debbie, W.1 aVidal, Guifre  uhttp://arxiv.org/abs/quant-ph/0303097v1