Error suppression in Hamiltonian-based quantum computation using energy penalties
Name
PhysRevA.92.022317.pdf
Size
1.28 MB
Format
Adobe PDF
Checksum (MD5)
47d6a4552a4ea90b6e396ad1ad94a25e
Author(s)
Bookatz, Adam D.
Farhi, Edward
Zhou, Leo
Date Issued
August 2015
Journal
Physical Review A
Publisher
American Physical Society
Citation
Bookatz, Adam D., Edward Farhi, and Leo Zhou. "Error suppression in Hamiltonian-based quantum computation using energy penalties." Phys. Rev. A 92, 022317 (August 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We consider the use of quantum error-detecting codes, together with energy penalties against leaving the code space, as a method for suppressing environmentally induced errors in Hamiltonian-based quantum computation. This method was introduced in Jordan et al. [Phys. Rev. A 74, 052322 (2006)]PLRAAN1050-294710.1103/PhysRevA.74.052322 in the context of quantum adiabatic computation, but we consider it more generally. Specifically, we consider a computational Hamiltonian, which has been encoded using the logical qubits of a single-qubit error-detecting code, coupled to an environment of qubits by interaction terms that act one-locally on the system. Additional energy penalty terms penalize states outside of the code space. We prove that in the limit of infinitely large penalties, one-local errors are completely suppressed, and we derive some bounds for the finite penalty case. Our proof technique involves exact integration of the Schrodinger equation, making no use of master equations or their assumptions. We perform long time numerical simulations on a small (one logical qubit) computational system coupled to an environment and the results suggest that the energy penalty method achieves even greater protection than our bounds indicate.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.92.022317
