Financial Index Tracking via Quantum Computing with Cardinality Constraints

Samuel Palmer, Konstantinos Karagiannis, Adam Florence, Asier Rodriguez, Roman Orus, Harish Naik and Samuel Mugel

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Abstract: In this work, we demonstrate how to apply non-linear cardinality constraints, important for real-world asset management, to quantum portfolio optimization. This enables us to tackle non-convex portfolio optimization problems using quantum annealing that would otherwise be challenging for classical algorithms. Being able to use cardinality constraints for portfolio optimization opens the doors to new applications for creating innovative portfolios and exchange-traded-funds (ETFs). We apply the methodology to the practical problem of enhanced index tracking and are able to construct smaller portfolios that significantly outperform the risk profile of the target index whilst retaining high degrees of tracking.

Date: 2022-08
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