The Quantum-House Effect: Filling the Gap Between Classicality and Quantum Discord

• URL: http://arxiv.org/abs/2205.12726v8
• Date: Mon, 19 Dec 2022 12:29:37 GMT
• Title: The Quantum-House Effect: Filling the Gap Between Classicality and Quantum Discord
• Authors: Tam\'as Varga
• Abstract summary: The quantum-house effect fills the gap between trivial correlations and quantum discord. The effect is demonstrated on SpinQ Gemini, a 2-qubit liquid-state NMR desktop quantum computer.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We introduce the quantum-house effect, a non-local phenomenon which apparently does not require quantum discord to be present. It suffices for the effect if neither subsystem of a bipartite system is in a pure state. This way, the quantum-house effect completely fills the gap between trivial correlations and quantum discord. However, we discuss why the situation is more subtle than that, by showing that in a concrete cryptographic setting called "the quantum-house game", the ability to produce quantum discord is in fact necessary for the quantum-house effect to work. Then, we suggest a principle called "quantum detachment" to characterize where quantumness in general departs from classicality, based on the information a physical system contains about itself. The quantum-house effect is demonstrated on SpinQ Gemini, a 2-qubit liquid-state NMR desktop quantum computer.

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