Enhanced Multiqubit Phase Estimation in Noisy Environments by Local Encoding

Massimiliano Proietti, Martin Ringbauer, Francesco Graffitti, Peter Barrow, Alexander Pickston, Dmytro Kundys, Daniel Cavalcanti, Leandro Aolita, Rafael Chaves, Alessandro Fedrizzi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
39 Downloads (Pure)


The first generation of multiqubit quantum technologies will consist of noisy, intermediate-scale devices for which active error correction remains out of reach. To exploit such devices, it is thus imperative to use passive error protection that meets a careful trade-off between noise protection and resource overhead. Here, we experimentally demonstrate that single-qubit encoding can significantly enhance the robustness of entanglement and coherence of four-qubit graph states against local noise with a preferred direction. In particular, we explicitly show that local encoding provides a significant practical advantage for phase estimation in noisy environments. This demonstrates the efficacy of local unitary encoding under realistic conditions, with potential applications in multiqubit quantum technologies for metrology, multipartite secrecy, and error correction.

Original languageEnglish
Article number180503
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 1 Nov 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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