Quantum

Pump quantization changes optimal measurements for quantum sensing

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 04/11/2026, 05:13:24 UTC.

Briefings

A 2026 arXiv preprint argues that quantum sensing advantages in phase estimation persist even when the pump laser is depleted, provided the nonlinear source dynamics are strong enough. The study identifies that Heisenberg scaling (N^2) emerges at maximum pump depletion, whereas maximum squeezing alone yields only N^(3/2). The authors propose that joint nonlinear measurements of the pump-signal system are required to achieve optimal performance.

Key points

• Quantum advantage in phase sensing persists despite pump quantization when nonlinear source dynamics are strong enough.
• Heisenberg scaling (N^2) emerges at maximum pump depletion, surpassing the shot-noise limit but not maximum squeezing alone.

Context

Standard quantum phase sensing analyses often treat the pump as an undepleted classical resource, ignoring its quantum nature and depletion. This work corrects that assumption by showing that realistic pump depletion and entanglement fundamentally alter the optimal measurement strategies for quantum sensing.

Limitations

The evidence is an arXiv preprint (v1) from November 2026, meaning it lacks peer review and may contain unverified claims. Results are limited to the specific regime of strong nonlinear source dynamics; the paper does not provide data on other regimes or compare against other measurement strategies beyond the proposed joint nonlinear measurement.

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