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Single-shot adaptive measurement for quantum-enhanced metrology
University of Borås, Faculty of Librarianship, Information, Education and IT.ORCID iD: 0000-0002-1539-8256
2016 (English)In: Quantum Communications and Quantum Imaging XIV, 2016, Vol. 9980, 99800HConference paper, Published paper (Refereed)
Abstract [en]

Quantum-enhanced metrology aims to estimate an unknown parameter such that the precision scales better than the shot-noise bound. Single-shot adaptive quantum-enhanced metrology (AQEM) is a promising approach that uses feedback to tweak the quantum process according to previous measurement outcomes. Techniques and formalism for the adaptive case are quite different from the usual non-adaptive quantum metrology approach due to the causal relationship between measurements and outcomes. We construct a formal framework for AQEM by modeling the procedure as a decision-making process, and we derive the imprecision and the Cram´er- Rao lower bound with explicit dependence on the feedback policy. We also explain the reinforcement learning approach for generating quantum control policies, which is adopted due to the optimal policy being non-trivial to devise. Applying a learning algorithm based on differential evolution enables us to attain imprecision for adaptive interferometric phase estimation, which turns out to be SQL when non-entangled particles are used in the scheme.

Place, publisher, year, edition, pages
2016. Vol. 9980, 99800H
Series
Proceedings of SPIE, ISSN 0277-786X
Keyword [en]
quantum metrology, adaptive quantum-enhanced metrology, reinforcement learning, interferometric phase estimation, feedback control, Markov decision process
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:hb:diva-11641DOI: 10.1117/12.2237355ISI: 000390027600008Scopus ID: 85006982177ISBN: 978-1-5106-0351-6 (print)ISBN: 978-1-5106-0352-3 (electronic)OAI: oai:DiVA.org:hb-11641DiVA: diva2:1062334
Conference
Quantum Communications and Quantum Imaging XIV, San Diego, August 28-29, 2016
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2017-03-17Bibliographically approved

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Publisher's full textScopushttp://dx.doi.org/10.1117/12.2237355

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf