Monday, July 15, 2013

1307.3468 (Yao-Kun Wang et al.)

One-way deficit of SU(2) invariant states    [PDF]

Yao-Kun Wang, Teng Ma, Shao-Ming Fei, Zhi-Xi Wang
We calculate analytically the one-way deficit for systems consisting spin-$j$ and spin-${1}{2}$ subsystems with SU(2) symmetry. Comparing our results with the quantum discord of SU(2) invariant states, we show that the one-way deficit is equal to the quantum discord for half-integer $j$, and is larger than the quantum discord for integer $j$. Moreover, we also compare the one-way deficit with entanglement of formation. The quantum entanglement tends to zero as $j$ increases, while the one-way deficit can remain significantly large.
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