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Usually, the three-tangle of a tripartite pure state of qubits can bedirectly measured with the simultaneous preparation of anot-less-than-four-fold copy of the state. We show that the exact genuinetripartite entanglement for ($2\otimes2\otimes n$)-dimensional pure quantumstates can be measured in a similar manner, provided that only two simultaneouscopies of the state are available. Lower bounds are also proposed for moreconvenient experimental operations. As an example, a comprehensivedemonstration of the scheme is provided for the three-tangle of a three-qubitstate.

Measurable genuine tripartite entanglement of ($2\otimes 2\otimes n$)-dimensional quantum states via only two simultaneous copies