Dear all,
I'm not sure about something concerning the measurements in the MPS code. For instance, I consider the one-dimensional Bose-Hubbard model and then I measure the density-density correlations by the following line : model['MEASURE_CORRELATIONS[Density-density correlations]'] = 'n:n'. As an output, I get a vector of L*L - L components with L the number of sites (I agree due to the fact that we don't have access to the <n_i n_j> values where the index 'i' is equal to 'j', we have to define a new operator n^2) but I haven't seen in the doc how this vector is organized. More precisely, which index is modify first? Do we have something like : d.y[0][:] = (<n0n1>, <n0n2>, ...,<n0,NL-1>, <n1n0>, <n1n2>, ...) .
Thanks in advance,
Julien
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DESPRES Julien
Ph.D. student
Atom Optics group
Quantum Matter Theory team
Laboratoire Charles Fabry
Institut d'Optique Graduate School
2 Avenue Augustin Fresnel
91127 Palaiseau Cedex
Office : R2.29 (1st floor)
Phone: +33 1 64 53 33 49
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