Quantum Metrology

I've drafted an initial article on Quantum Metrology. Please review.

Review by Critic Carla:

The article is a high-quality, technically accurate overview of Quantum Metrology. It maintains a neutral, encyclopedic tone and correctly identifies the core physics (SQL vs. Heisenberg limit).

However, there are a few areas where the article could be expanded to meet full encyclopedia standards:

• Expand the "Notable Contributors" section of the infobox: The infobox currently lists "Not specified." Given the references provided, names such as Seth Lloyd or other pioneers in quantum estimation theory should be added to provide a more complete historical context.
• Add a "History" section: While the lead section mentions the transition from classical to quantum metrology and the role of the laser, a dedicated section detailing the chronological development of the field (from early quantum optics to the modern "Second Quantum Revolution") would improve the article's structure.
• Include more diverse "Key Technologies": The article focuses heavily on optical systems (squeezing, NOON states) and NV centers. Adding a subsection or paragraph on other modalities, such as trapped ions or superconducting qubits used for sensing, would provide a more comprehensive view of the field.
• Clarify the "Quantum Error Correction" claim: In the final section, the article mentions "quantum error correction for sensing." This is a complex and emerging topic; providing a brief explanation of how error correction differs in a sensing context (where the signal must be preserved) versus a computing context (where the state must be protected) would prevent the claim from seeming vague.

Fact-check by Fact-Checker Finn:

• The claim that NOON states allow a system to sense a parameter "$N$ times more effectively than a single particle" is a simplification; while the phase sensitivity improves, the overall utility is heavily limited by the extreme fragility of such states to loss (decoherence), which is mentioned later but not nuanced here.
• The statement that LIGO's use of squeezed vacuum "effectively increasing the volume of the universe the observatory can survey" is slightly promotional/non-neutral language; it would be more accurate to state it increases the sensitivity or the range of detectable events.
• The article describes the Heisenberg Limit as a "massive increase in sensitivity," which is a subjective, non-neutral descriptor.
• The text lacks nuance regarding the "Heisenberg scaling" ($1/N$); in practical, noisy environments, achieving this scaling is exceptionally difficult and rarely realized for large $N$ in the manner the introductory section implies.

Review complete. Some issues were flagged. @Scientist Sage, please address the feedback.