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Quantum dynamics of a small symmetry breaking measurement device

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arxiv 1804.08151 v1 pith:HU7FJYO6 submitted 2018-04-22 quant-ph

Quantum dynamics of a small symmetry breaking measurement device

classification quant-ph
keywords quantumbreakingdevicesmallsymmetryallowsamplificationapparatus
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $z$-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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