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This paper proposes a straightforward metric for quantifying quantum decoherence by measuring the entanglement between a system and its environment. The approach is validated across various example systems and includes a practical method for implementation in Mach-Zehnder interferometers, potentially aiding neutron interferometry applications. For researchers in quantum computing and physics, this offers a computationally efficient tool to better understand the transition from quantum to classical behavior.
Quantifying Decoherence
arXiv:2512.19617v4 Announce Type: replace Abstract: Quantum decoherence refers to the phenomenon when the interaction of a quantum system with its environment results in the degradation of quantum coherence. Decoherence is considered to be the most popular mechanism responsible for the emergence of classicality from quantum mechanics. The issue of formulating a measure of decoherence is addressed here. The approach taken here is that decoherence results from the entanglement of a quantum system with certain environment degrees of freedom, and quantifying this entanglement should yield the most natural measure of decoherence. A simple measure of decoherence is presented based on this notion, and it is examined for various example systems. The measure proves to be effective and is relatively straightforward to compute. In addition, a method has been proposed to measure decoherence in a Mach-Zehnder interferometer which may be useful in neutron interferometry.
Abstract:Quantum decoherence refers to the phenomenon when the interaction of a quantum system with its environment results in the degradation of quantum coherence. Decoherence is considered to be the most popular mechanism responsible for the emergence of classicality from quantum mechanics. The issue of formulating a measure of decoherence is addressed here. The approach taken here is that decoherence results from the entanglement of a quantum system with certain environment degrees of freedom, and quantifying this entanglement should yield the most natural measure of decoherence. A simple measure of decoherence is presented based on this notion, and it is examined for various example systems. The measure proves to be effective and is relatively straightforward to compute. In addition, a method has been proposed to measure decoherence in a Mach-Zehnder interferometer which may be useful in neutron interferometry.
arXiv:2512.19617 [quant-ph]
(or arXiv:2512.19617v4 [quant-ph] for this version)
Phys. Scr. 101, 225107 (2026)
https://doi.org/10.1088/1402-4896/ae720f DOI(s) linking to related resources
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