Partial Trace and Density Matrix of a Pure State

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GABBA
GABBA on 6 Aug 2016
Edited: GABBA on 6 Aug 2016
I have the pure state phi = (1/2)*(|0>a|0>b + |0>a|1>b + |1>a|0>b + |1>a|1>b), and I want to take the bra multiplied by the ket to to get the density matrix Pab = |phi><phi|. Then, I want to find the partial trace TrbPab.
How can I do this on MatLab? A general sketch of the code would be helpful, particularly how you code phi, Pab, and TrbPab.

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