Entanglement is not a critical resource for quantum metrology

2009/06/30 by Todd Tilma, Shinichiro Hamaji, William J. Munro +2 · 51 citations
Computer Science · Physics and Astronomy · #Computer science #Metrology #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum entanglement #Quantum mechanics #Quantum metrology #Quantum network #Quantum sensor #Resource (disambiguation) #quant-ph

paper · pdf · doi:10.1103/physreva.81.022108

published in Physical Review A 81(2) (American Physical Society) · 6 pages, no figures. To be published in Phys. Rev. A

arxiv created 2010/01/15 · openalex publication_date 2010/02/11 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate high-precision measurements beyond the standard quantum limit, utilizing nonclassical states. Although entanglement was considered a resource for achieving the Heisenberg limit in measurements, we show that any advantage expected from using entanglement is dependent on the measurement in question. We investigate several measurement scenarios and illustrate the role of entanglement as a resource for quantum high-precision measurement. In particular, we demonstrate that there is a regime wherein entanglement not only does not help, but prevents the achievement of the fundamental limit.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Quantum Metrology: Dynamics versus Entanglement
• Efficient Classical Simulation of Continuous Variable Quantum Information Processes

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• Achieving Heisenberg-Scaling Precision with Projective Measurement on Single Photons