Measuring the Tangle of Three-Qubit States
Year: 2020
Type: article
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.
Source: Entropy
DOI: 10.3390/e22040436
Institutions: Barcelona Supercomputing Center, Institut de Ciències del Cosmos, Universitat de Barcelona, Consejo Superior de Investigaciones Científicas, Instituto de Física Teórica, Universidad Autónoma de Madrid, Centre for Quantum Technologies, National University of Singapore, Technology Innovation Institute
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,690
Award: G121402619
OpenAlex ID: W3011371351