Coarse-graining in retrodictive quantum state tomography

Dale Scerri, Erik Gauger, George C. Knee

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Quantum state tomography often operates in the highly idealised scenario of assuming perfect measurements. The errors implied by such an approach are entwined with other imperfections relating to the information processing protocol or application of interest. We consider the problem of retrodicting the quantum state of a system, existing prior to the application of random but known phase errors, allowing those errors to be separated and removed. The continuously random nature of the errors implies that there is only one click per measurement outcome -- a feature having a drastically adverse effect on data-processing times. We provide a thorough analysis of coarse-graining under various reconstruction algorithms, finding dramatic increases in speed for only modest sacrifices in fidelity.
Original languageEnglish
Article number075003
JournalJournal of Physics Communications
Issue number7
Early online date8 Jul 2019
Publication statusPublished - Jul 2019


  • quant-ph


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