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• W3102097462 abstract "Physical constraints make it challenging to implement and control many-body interactions. For this reason, designing quantum information processes with Hamiltonians consisting of only one- and two-local terms is a worthwhile challenge. Enabling error suppression with two-local Hamiltonians is particularly challenging. A no-go theorem of Marvian and Lidar [Physical Review Letters 113(26), 260504 (2014)] demonstrates that, even allowing particles with high Hilbert-space dimension, it is impossible to protect quantum information from single-site errors by encoding in the ground subspace of any Hamiltonian containing only commuting two-local terms. Here, we get around this no-go result by encoding in the ground subspace of a Hamiltonian consisting of non-commuting two-local terms arising from the gauge operators of a subsystem code. Specifically, we show how to protect stored quantum information against single-qubit errors using a Hamiltonian consisting of sums of the gauge generators from Bacon-Shor codes [Physical Review A 73(1), 012340 (2006)] and generalized-Bacon-Shor code [Physical Review A 83(1), 012320 (2011)]. Our results imply that non-commuting two-local Hamiltonians have more error-suppressing power than commuting two-local Hamiltonians. While far from providing full fault tolerance, this approach improves the robustness achievable in near-term implementable quantum storage and adiabatic quantum computations, reducing the number of higher-order terms required to encode commonly used adiabatic Hamiltonians such as the Ising Hamiltonians common in adiabatic quantum optimization and quantum annealing." @default.
• W3102097462 created "2020-11-23" @default.
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• W3102097462 date "2017-02-18" @default.
• W3102097462 modified "2023-10-17" @default.
• W3102097462 title "Non-commuting two-local Hamiltonians for quantum error suppression" @default.
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• W3102097462 doi "https://doi.org/10.1007/s11128-017-1527-9" @default.
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