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, and Alessandro Fedrizzi
Phys. Rev. Lett. 123, 180503 – Published 1 November 2019
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Abstract

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.

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  • Received 13 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.180503

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Massimiliano Proietti1, Martin Ringbauer2, Francesco Graffitti1, Peter Barrow1, Alexander Pickston1, Dmytro Kundys1, Daniel Cavalcanti3, Leandro Aolita4, Rafael Chaves5,6, and Alessandro Fedrizzi1

  • 1Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 2Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria
  • 3ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
  • 4Instituto de Física, Universidade Federal do Rio de Janeiro, P.O. Box 68528, Rio de Janeiro, RJ 21941-972, Brazil
  • 5International Institute of Physics, Federal University of Rio Grande do Norte, 59070-405 Natal, Brazil
  • 6School of Science and Technology, Federal University of Rio Grande do Norte, 59078-970 Natal, Brazil

See Also

Demonstrating Quantum Coherence and Metrology that is Resilient to Transversal Noise

Chao Zhang, Thomas R. Bromley, Yun-Feng Huang, Huan Cao, Wei-Min Lv, Bi-Heng Liu, Chuan-Feng Li, Guang-Can Guo, Marco Cianciaruso, and Gerardo Adesso
Phys. Rev. Lett. 123, 180504 (2019)

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Issue

Vol. 123, Iss. 18 — 1 November 2019

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