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 – Published 1 November 2019
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Abstract

Quantum systems can be exploited for disruptive technologies but in practice quantum features are fragile due to noisy environments. Quantum coherence, a fundamental such feature, is a basis-dependent property that is known to exhibit a resilience to certain types of Markovian noise. Yet, it is still unclear whether this resilience can be relevant in practical tasks. Here, we experimentally investigate the resilient effect of quantum coherence in a photonic Greenberger-Horne-Zeilinger state under Markovian bit-flip noise, and explore its applications in a noisy metrology scenario. In particular, using up to six-qubit probes, we demonstrate that the standard quantum limit can be outperformed under a transversal noise strength of approximately equal magnitude to the signal, providing experimental evidence of metrological advantage even in the presence of uncorrelated Markovian noise. This work highlights the important role of passive control in noisy quantum hardware, which can act as a low-overhead complement to more traditional approaches such as quantum error correction, thus impacting on the deployment of quantum technologies in real-world settings.

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  • Received 24 July 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.180504

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

Chao Zhang1,2, Thomas R. Bromley3,*, Yun-Feng Huang1,2,†, Huan Cao1,2, Wei-Min Lv1,2, Bi-Heng Liu1,2, Chuan-Feng Li1,2,‡, Guang-Can Guo1,2, Marco Cianciaruso3,§, and Gerardo Adesso3,∥

  • 1Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, People’s Republic of China
  • 2CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, People’s Republic of China
  • 3School of Mathematical Sciences and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham, University Park Campus, Nottingham NG7 2RD, United Kingdom

  • *thomas.r.bromley@gmail.com
  • hyf@ustc.edu.cn
  • cfli@ustc.edu.cn
  • §cianciaruso.marco@gmail.com
  • gerardo.adesso@nottingham.ac.uk

See Also

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 (2019)

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Issue

Vol. 123, Iss. 18 — 1 November 2019

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