4.6 Article

Sub-shot-noise-limited phase estimation via single-mode inputs

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Summary: Research shows that quantum technologies can overcome the shot-noise limit of traditional optical measurements. By efficiently designing a source of spontaneous parametric downconversion in combination with photon-number-resolving detection, quantum-enhanced optical phase estimation has been achieved, surpassing the shot-noise limit. Utilizing the robustness of two-mode squeezed vacuum states allows scalability of the technique, and sensitivity can be further improved by generating and detecting high-order photon pairs.

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