Limitations to sharing entanglement
  We discuss limitations to sharing entanglement known as monogamy of entanglement. Our pedagogical approach commences with simple examples of limited entanglement sharing for pure three-qubit states and progresses to the more general case of mixed-state monogamy relations with multiple qudits. 
Jeong San Kim, Gilad Gour and Barry C. Sanders
quant-ph math-ph math.MP