Abstract
We demonstrate a new method to achieve the maximum singlet fraction using an entangled mixed two-qubit state as a resource. For this, we establish a tight upper bound on singlet fraction and show that the maximal singlet fraction obtained in Verstraete and Verschelde (Phys Rev Lett 90:097901(1)–097901(4), 2003) does not attain the upper bound on the singlet fraction derived here. Interestingly, we found that the required upper bound can, in fact, be achieved using local filtering operations.
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Adhikari, S., Kumar, A. Upper bound on singlet fraction of two-qubit mixed entangled states. Quantum Inf Process 15, 2797–2803 (2016). https://doi.org/10.1007/s11128-016-1295-y
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DOI: https://doi.org/10.1007/s11128-016-1295-y