Non-maximal Tripartite Entanglement Degradation of Dirac and Scalar   fields in Non-inertial frames
  The {\pi}-tangle is used to study the behavior of entanglement of a nonmaximal tripartite state of both Dirac and scalar fields in accelerated frame. For Dirac fields, the degree of degradation with acceleration of both one-tangle of accelerated observer and {\pi}-tangle, for the same initial entanglement, is different by just interchanging the values of probability amplitudes. A fraction of both one-tangles and the {\pi}-tangle always survives for any choice of acceleration and the degree of initial entanglement. For scalar field, the one-tangle of accelerated observer depends on the choice of values of probability amplitudes and it vanishes in the range of infinite acceleration, whereas for {\pi}-tangle this is not always true. The dependence of {\pi}-tangle on probability amplitudes varies with acceleration. In the lower range of acceleration, its behavior changes by switching between the values of probability amplitudes and for larger values of acceleration this dependence on probability amplitudes vanishes. Interestingly, unlike bipartite entanglement, the degradation of {\pi}-tangle against acceleration in the case of scalar fields is slower than for Dirac fields. 
Salman Khan, Niaz Ali Khan, M.K. Khan
quant-ph