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PIRSA:20020060

Video URL

https://pirsa.org/20020060

The theory of entanglement-assisted quantum metrology

          @misc{ scivideos_PIRSA:20020060,
            doi = {10.48660/20020060},
            url = {https://pirsa.org/20020060},
            author = {Zhou, Sisi},
            keywords = {Other Physics},
            language = {en},
            title = {The theory of entanglement-assisted quantum metrology},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2020},
            month = {feb},
            note = {PIRSA:20020060 see, \url{https://scivideos.org/index.php/pirsa/20020060}}
          }

Sisi Zhou

Talk numberPIRSA:20020060
DOI10.48660/20020060
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The quantum Fisher information (QFI) measures the amount of information that a quantum state carries about an unknown parameter. Given a quantum channel, its entanglement-assisted QFI is the maximum QFI of the output state assuming an input state over the system and an arbitrarily large ancilla. Consider N identical copies of a quantum channel, the channel QFI grows either linearly or quadratically with N asymptotically. Here we obtain a simple criterion that determines whether the scaling is linear or quadratic. In both cases, we found a quantum error correction protocol achieving the channel QFI asymptotically and an SDP to solve the optimal code.