Research Paper#Quantum Metrology, Phase Estimation, Bell Measurements🔬 ResearchAnalyzed: Jan 3, 2026 16:25
Joint Phase and Phase Diffusion Estimation with Bell Measurements
Published:Dec 27, 2025 11:12
•1 min read
•ArXiv
Analysis
This paper addresses a critical problem in quantum metrology: the degradation of phase estimation accuracy due to phase-diffusive noise. It demonstrates a practical solution by jointly estimating phase and phase diffusion using deterministic Bell measurements. The use of collective measurements and a linear optical network highlights a promising approach to overcome limitations in single-copy measurements and achieve improved precision. This work contributes to the advancement of quantum metrology by providing a new framework and experimental validation of a collective measurement strategy.
Key Takeaways
- •Addresses the problem of phase estimation accuracy degradation due to phase-diffusive noise.
- •Demonstrates joint estimation of phase and phase diffusion.
- •Employs deterministic Bell measurements on a two-qubit system.
- •Achieves improved estimation precision compared to separable measurement strategies.
- •Highlights the advantages of collective measurements in multi-parameter quantum metrology.
Reference
“The work experimentally demonstrates joint phase and phase-diffusion estimation using deterministic Bell measurements on a two-qubit system, achieving improved estimation precision compared to any separable measurement strategy.”