The following questions are those related to quantum entanglement in my mind:

1) What's the general definition of the measure of entanglement? so, far, we have got to know several items, such as Schmidt number, von Neumann entropy (compare with Shannon entropy), and concurrence. 

2) I would like to know the interrelations among the above definitions and also the validity scope for them. 

3) I suppose the above questions should cover the qubit, qutrit and qudit cases (all are discreste cases); and the bipartite and multi-partite cases (number of the particles); and also the case for bipartite continuous variable cases.

4) Further, we should consider both the pure state case and mixed state cases.

5) For the measurement of entanglement, i would like to know, generally, how to measure the entanglement degree experimentally. I would like to know the details of conincidence measurement, the fidelity and the related stuff. Further, i'd like to know from Brazil's science paper how to measure the entanglement without disturbing the system.

 

 

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