PIRSA:21110023

Video URL

https://pirsa.org/21110023

Exponential Error Suppression for Near-Term Quantum Devices

Koczor, B. (2021). Exponential Error Suppression for Near-Term Quantum Devices. Perimeter Institute for Theoretical Physics. https://pirsa.org/21110023

Koczor, Balint. Exponential Error Suppression for Near-Term Quantum Devices. Perimeter Institute for Theoretical Physics, Nov. 24, 2021, https://pirsa.org/21110023 

          @misc{ scivideos_PIRSA:21110023,
            doi = {10.48660/21110023},
            url = {https://pirsa.org/21110023},
            author = {Koczor, Balint},
            keywords = {Quantum Information},
            language = {en},
            title = {Exponential Error Suppression for Near-Term Quantum Devices},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2021},
            month = {nov},
            note = {PIRSA:21110023 see, \url{https://scivideos.org/index.php/pirsa/21110023}}
          }

Balint Koczor University of Oxford

Talk numberPIRSA:21110023
DOI10.48660/21110023
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Suppressing noise in physical systems is of fundamental importance. As quantum computers mature, quantum error correcting codes (QECs) will be adopted in order to suppress errors to any desired level. However in the noisy, intermediate-scale quantum (NISQ) era, the complexity and scale required to adopt even the smallest QEC is prohibitive: a single logical qubit needs to be encoded into many thousands of physical qubits. Here we show that, for the crucial case of estimating expectation values of observables (key to almost all NISQ algorithms) one can indeed achieve an effective exponential suppression. We take n independently prepared circuit outputs to create a state whose symmetries prevent errors from contributing bias to the expected value. The approach is very well suited for current and near-term quantum devices as it is modular in the main computation and requires only a shallow circuit that bridges the n copies immediately prior to measurement. Using no more than four circuit copies, we confirm error suppression below 10−6 for circuits consisting of several hundred noisy gates (2-qubit gate error 0.5%) in numerical simulations validating our approach. This talk is based on [B. Koczor, Phys. Rev. X 11, 031057] and [B. Koczor, New J. Phys. (accepted), arXiv:2104.00608].

Zoom Link: https://pitp.zoom.us/j/91654758635?pwd=TEtPMmZMNGZya1JOc05KbGt6OUpjdz09