Please use this identifier to cite or link to this item: https://doi.org/10.3390/E22040436
Title: Measuring the tangle of three-qubit states
Authors: Pérez-Salinas, A.
García-Martín, D.
Bravo-Prieto, C.
Latorre, J.I. 
Keywords: Canonical form
Quantum algorithm
Tangle
Three-qubit state
Issue Date: 2020
Publisher: MDPI AG
Citation: Pérez-Salinas, A., García-Martín, D., Bravo-Prieto, C., Latorre, J.I. (2020). Measuring the tangle of three-qubit states. Entropy 22 (4) : 436. ScholarBank@NUS Repository. https://doi.org/10.3390/E22040436
Rights: Attribution 4.0 International
Abstract: We present a quantum circuit that transforms an unknown three-qubit state into its canonical form, up to relative phases, given many copies of the original state. The circuit is made of three single-qubit parametrized quantum gates, and the optimal values for the parameters are learned in a variational fashion. Once this transformation is achieved, direct measurement of outcome probabilities in the computational basis provides an estimate of the tangle, which quantifies genuine tripartite entanglement. We perform simulations on a set of random states under different noise conditions to asses the validity of the method. @ 2020 by the authors.
Source Title: Entropy
URI: https://scholarbank.nus.edu.sg/handle/10635/198921
ISSN: 1099-4300
DOI: 10.3390/E22040436
Rights: Attribution 4.0 International
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