Entanglement-enhanced probing of a delicate material system

By F. Wolfgramm, C. Vitelli, F. Beduini, N. Godbout, Morgan W. Mitchell. Nature Photonics, 2012

143 citations recorded by the source corpus.

Quantum metrology1 uses entanglement2,3,4,5 and other quantum effects6 to improve the sensitivity of demanding measurements7,8,9. Probing of delicate systems demands high sensitivity from limited probe energy and has motivated the field's key benchmark—the standard quantum limit10. Here we report the first entanglement-enhanced measurement of a delicate material system. We non-destructively probe an atomic spin ensemble by means of near-resonant Faraday rotation, a measurement that is limited by probe-induced scattering in quantum-memory and spin-squeezing applications6,11,12,13. We use narrowband, atom-resonant NOON states to beat the standard quantum limit of sensitivity by more than five standard deviations, both on a per-photon and per-damage basis. This demonstrates quantum enhancement with fully realistic loss and noise, including variable-loss effects14,15,16. The experiment opens the way to ultra-gentle probing of single atoms17, single molecules18, quantum gases19 and living cells20. Researchers report the entanglement-enhanced measurement of a delicate material system, in which they non-destructively probe an 85Rb atomic spin ensemble by near-resonant Faraday rotation. They use narrowband, atom-resonant ‘NOON’ states to beat the standard quantum limit of sensitivity by more than five standard deviations, both on a per-photon and a per-damage basis.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/fe3884aa057a57bb6bfbd1ee6083962bfd93398f

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Citations in the corpus

Quantum Optical Technologies for Metrology, Sensing, and Imaging (2014, methodology): “citing new area of research with potential applications, e.g., in gravitational wave detection [7], quantum positioning and clock synchronization [8], quantum frequency standards [9], quantum sensing [10],[11], quantum radar and LIDAR [12],[13], quantum imaging [14],[15] and quantum lithography [16]”
Imaging with quantum states of light (2019, background): “In the context of imaging, one application of quantum metrology arises in the measurement of delicate samples [100, 101].”
Quantum metrology and its application in biology (2014, methodology): “[207] applied two-photon NOON states to perform optical readout in atomic magnetometry.”