One-way deficit of SU(2) invariant states

Yao-Kun Wang, Teng Ma, Shao-Ming Fei, and Zhi-Xi Wang

Contact the author: Please use for correspondence this email.
Submission date: 19. Aug. 2014
Pages: 13
published in: Reports on mathematical physics, 73 (2014) 2, p. 165-175 
DOI number (of the published article): 10.1016/S0034-4877(14)60038-0
Bibtex
Download full preprint: PDF (170 kB), PS ziped (447 kB)

Abstract:
We calculate analytically the one-way deficit for systems consisting spin-j and spin- 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.