An observable measure of entanglement for pure states of multi-qubit systems
- 1 November 2003
- journal article
- Published by Rinton Press in Quantum Information and Computation
- Vol. 3 (6) , 619-626
- https://doi.org/10.26421/qic3.6-5
Abstract
Recently, Meyer and Wallach [Meyer and Wallach (2002), J. of Math. Phys., 43, pp. 4273] proposed a measure of multi-qubit entanglement that is a function on pure states. We find that this function can be interpreted as a physical quantity related to the average purity of the constituent qubits and show how it can be observed in an efficient manner without the need for full quantum state tomography. A possible realization is described for measuring the entanglement of a chain of atomic qubits trapped in a 3D optical lattice.Keywords
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