Unconditional violation of the shot-noise limit in photonic quantum metrology
By S. Slussarenko, M. M. Weston, H. Chrzanowski, L. Shalm, V. Verma, Sae Woo Nam, G. Pryde. 2017
240 citations recorded by the source corpus.
Interferometric phase measurement is widely used to precisely determine quantities such as length, speed and material properties1–3. Without quantum correlations, the best phase sensitivity $${\boldsymbol{\Delta }}{\boldsymbol{\phi }}$$Δϕ achievable using n photons is the shot-noise limit, $${\boldsymbol{\Delta }}{\boldsymbol{\phi }}=1\,/\sqrt{{n}}$$Δϕ=1∕n. Quantum-enhanced metrology promises better sensitivity, but, despite theoretical proposals stretching back decades3,4, no measurement using photonic (that is, definite photon number) quantum states has truly surpassed the shot-noise limit. Instead, all such demonstrations, by discounting photon loss, detector inefficiency or other imperfections, have considered only a subset of the photons used. Here, we use an ultrahigh-efficiency photon source and detectors to perform unconditional entanglement-enhanced photonic interferometry. Sampling a birefringent phase shift, we demonstrate precision beyond the shot-noise limit without artificially correcting our results for loss and imperfections. Our results enable quantum-enhanced phase measurements at low photon flux and open the door to the next generation of optical quantum metrology advances.Unconditional entanglement-enhanced photonic interferometry is implemented by using a state-of-the-art photon source and detectors. Sampling a birefringent phase shift, precision beyond the shot-noise limit is demonstrated without data correction.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/d524414a25c7d15c25211ee9fcfe08919dcf42fd
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Photonic quantum information processing: A concise review (2019, background): “55 However, these advances relate to what happens when a photon pair is generated—the pair generation process itself is probabilistic.”