Heisenberg-limited metrology with perturbing interactions
arXiv:2308.10929 · doi:10.22331/q-2024-03-28-1303
Abstract
We show that it is possible to perform Heisenberg-limited metrology on GHZ-like states, in the presence of generic spatially local, possibly strong interactions during the measurement process. An explicit protocol, which relies on single-qubit measurements and feedback based on polynomial-time classical computation, achieves the Heisenberg limit. In one dimension, matrix product state methods can be used to perform this classical calculation, while in higher dimensions the cluster expansion underlies the efficient calculations. The latter approach is based on an efficient classical sampling algorithm for short-time quantum dynamics, which may be of independent interest.
arXiv comment30+7 pages, 3+0 figures. Presented at the 27th Annual Conference on Quantum Information Processing (QIP 2024) as a talk. Accepted for publication in Quantum
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