Characterizing the coherence of errors


Wallman, J. (2015). Characterizing the coherence of errors. Perimeter Institute. https://pirsa.org/15090088


Wallman, Joel. Characterizing the coherence of errors. Perimeter Institute, Sep. 30, 2015, https://pirsa.org/15090088


          @misc{ pirsa_PIRSA:15090088,
            doi = {10.48660/15090088},
            url = {https://pirsa.org/15090088},
            author = {Wallman, Joel},
            keywords = {Quantum Information},
            language = {en},
            title = {Characterizing the coherence of errors},
            publisher = {Perimeter Institute},
            year = {2015},
            month = {sep},
            note = {PIRSA:15090088 see, \url{https://pirsa.org}}

Joel Wallman Institute for Quantum Computing (IQC)


I will introduce the unitarity, a parameter quantifying the coherence of a channel and show that it is useful for two reasons. First, it can be efficiently estimated via a variant of randomized benchmarking. Second, it captures useful information about the channel, such as the optimal fidelity achievable with unitary corrections and an improved bound on the diamond distance.