Using quantum tomography and a single entangled state it is possible to characterize completely a quantum device, a channel, or a measuring apparatus. The method is very robust to imperfections of the tomographers and of the input state (which more generally can be a “faithful” state), and can be made very efficient by max-likelihood methods specially designed for this purpose. Using this method with homodyne detection one can in principle achieve the first absolute characterization of a photocounter.
CITATION STYLE
D’Ariano, G. M., & Presti, P. L. (2004). 8 Characterization of Quantum Devices (pp. 297–332). https://doi.org/10.1007/978-3-540-44481-7_8
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