Quantum dynamics of a small symmetry breaking measurement device
H. C. Donker, H. De Raedt, M. I. Katsnelson
TL;DR
This paper presents a quantum measurement device using symmetry breaking in a small spin system, demonstrating how microscopic signals can be amplified and measured through quantum many-body dynamics.
Contribution
It introduces a small, spin-based quantum measurement model employing symmetry breaking, with detailed analysis of quantum coherence, correlation formation, and irreversibility.
Findings
Loss of phase coherence analyzed
System-apparatus correlations formed and amplified
Irreversibility and fault tolerance demonstrated
Abstract
A quantum measuring instrument is constructed that utilises symmetry breaking to enhance a microscopic signal. The entire quantum system consists of a system-apparatus-environment triad that is composed of a small set of spin-1/2 particles. The apparatus is a ferromagnet that measures the -component of a single spin. A full quantum many-body calculation allows for a careful examination of the loss of phase coherence, the formation and amplification of system-apparatus correlations, the irreversibility of registration, the fault tolerance, and the bias of the device.
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