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quant-ph2006
Polynomial invariants and Bell inequalities as entanglement measure of 4-qubit states
Jochen Endrejat, Helmut Buettner
We compare the polynomial invariants for four qubits introduced by Luque and Thibon, PRA {\bf 67}, 042303 (2003), with optimized Bell inequalities and a combination of two qubit co…
quant-ph2005
Entanglement measurement with discrete multiple coin quantum walks
Jochen Endrejat, Helmut Buettner
Within a special multi-coin quantum walk scheme we analyze the effect of the entanglement of the initial coin state. For states with a special entanglement structure it is shown th…
quant-ph2004
Characterization of entanglement of more than two qubits with Bell inequalities and global entanglement
J. Endrejat, H. Buettner
It is shown that the entanglement-structure of 3- and 4-qubit states can be characterized by optimized operators of the Mermin-Klyshko type. It is possible to discriminate between…