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We demonstrate detection of radio-frequency fields and arbitrarily-shaped radio-frequency waveform components beyond the projection noise limit (PNL). Our work employs a measure-evolve-measure (MEM) sequence, in which a first stroboscopic quantum non-demolition (QND) measurement M1 produces a state with reduced projection noise, a period of free evolution accumulates signal, and a second stroboscopic...
We report certified quantum non-demolition measurement of atomic spins using criteria developed for continuous variable experiments in optics. We observe quantum state preparation and information-damage trade-off beyond classical limits by seven and twelve standard deviations.
We extend the covariance-matrix description of atom-light quantum interfaces to spin-1 systems including technical noise and decoherences. We use this description to predict and produce a planar squeezed state in a cold 87Rb ensemble.
We report a nonlinear alignment-to-orientation conversion measurement of atomic spins that simultaneously shows super-Heisenberg scaling and achieves projection-noise limited sensitivity of 990 spins, 20 dB more sensitive than the previous best nonlinear measurement. Using this technique, we have recently demonstrated conditional spin squeezing of the atomic ensemble, and entanglement-enhanced measurement...
We report an experimental study of a new technique for entropic cooling of the spin in an ensemble of ultracold atoms via quantum non-demolition (QND) measurement and incoherent feedback.
When molecules are resonantly excited by enhanced near field of silver nanostrips, through a balance between field enhancement and decay modification, Mollow triplet of fluorescence and antibunching of emission photons are found.
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