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Improved algorithm for quantum separability and entanglement detection

L. M. Ioannou·B. C. Travaglione·D. Cheung·A. K. Ekert
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Abstract

Determining whether a quantum state is separable or entangled is a problem of fundamental importance in quantum information science. It has recently been shown that this problem is NP-hard. There is a highly inefficient `basic algorithm' for solving the quantum separability problem which follows from the definition of a separable state. By exploiting specific properties of the set of separable states, we introduce a new classical algorithm that solves the problem significantly faster than the `basic algorithm', allowing a feasible separability test where none previously existed e.g. in 3-by-3-dimensional systems. Our algorithm also provides a novel tool in the experimental detection of entanglement.

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L. M. Ioannou, B. C. Travaglione, D. Cheung, A. K. Ekert. 2005-07-15. Improved algorithm for quantum separability and entanglement detection. https://doi.org/10.1103/physreva.70.060303

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