Phys. Rev. A 80, 052111 (2009) [6 pages]State tomography of a qubit through scattering of a probe qubitReceived 30 July 2009; published 18 November 2009 We discuss the state tomography of a fixed qubit (a spin-1/2 target particle), which is in general in a mixed state, through one-dimensional scattering of a probe qubit off the target. Two strategies are presented by making use of different degrees of freedom of the probe, i.e. spin and momentum. Remarkably, the spatial degree of freedom of the probe can be utilized for optimizing the tomographic schemes. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.80.052111
DOI:
10.1103/PhysRevA.80.052111
PACS:
03.65.Wj, 03.65.Nk, 72.10.−d
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