Quantum-Classical Separation in Bounded-Resource Tasks Arising from Measurement Contextuality

• URL: http://arxiv.org/abs/2512.02284v1
• Date: Mon, 01 Dec 2025 23:54:32 GMT
• Title: Quantum-Classical Separation in Bounded-Resource Tasks Arising from Measurement Contextuality
• Abstract summary: We show that quantum contextuality enables certain tasks to be performed with success probabilities beyond classical limits.<n>Our work proposes novel ways to benchmark quantum processors using contextuality-based algorithms.
• Score: 107.84586711462556
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The prevailing view is that quantum phenomena can be harnessed to tackle certain problems beyond the reach of classical approaches. Quantifying this capability as a quantum-classical separation and demonstrating it on current quantum processors has remained elusive. Using a superconducting qubit processor, we show that quantum contextuality enables certain tasks to be performed with success probabilities beyond classical limits. With a few qubits, we illustrate quantum contextuality with the magic square game, as well as quantify it through a Kochen--Specker--Bell inequality violation. To examine many-body contextuality, we implement the N-player GHZ game and separately solve a 2D hidden linear function problem, exceeding classical success rate in both. Our work proposes novel ways to benchmark quantum processors using contextuality-based algorithms.

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