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Quantum Physics

arXiv:1302.0882 (quant-ph)
[Submitted on 4 Feb 2013]

Title:Measurement of a qubit and measurement with a qubit

Authors:Antonio Di Lorenzo
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Abstract:Generally, the measurement process consists in coupling a system to a detector that can give a continuous output. However, it may be interesting to use as a detector a system with a discrete spectrum, especially in view of applications to quantum information. Here, we study 1) a two-level system measuring another two-level system (qubit); 2) a generic system measuring a qubit; 3) a qubit measuring a generic system. The results include the case when a postselection on the measured system is made. We provide the exact solution, and also a controlled expansion in the coupling parameter, giving formulas valid in the weak measurement regime for arbitrary preparation and postselection. The concept of generalized Wigner functions is introduced.
Comments: 18 pages, 1 figure, 1 table. Comments welcome
Subjects: Quantum Physics (quant-ph)
Cite as: arXiv:1302.0882 [quant-ph]
  (or arXiv:1302.0882v1 [quant-ph] for this version)
  https://doi.org/10.48550/arXiv.1302.0882
arXiv-issued DOI via DataCite

Submission history

From: Antonio Di Lorenzo [view email]
[v1] Mon, 4 Feb 2013 21:55:39 UTC (49 KB)
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