Dispersion cancellation and nonclassical noise reduction for large-photon-number states

Optimal Signal-to-Quantum Noise Ratio for Nonclassical Number States

We analyze the properties of nonclassical number states, specifically squeezed number states D(α)S(z)|n〉, and find their maximum signal-to-quantum noise ratio. It is shown that the optimal signal-to-quantum noise ratio for these states decreases as 1/(2n+1)2, where n is the photon number, from the optimal value as derived by Yuen. PACS 42.50.Dv, 42.50.Lc

Nonclassical correlations of phase noise and photon number in quantum nondemolition measurements

The continuous transition from a low resolution quantum nondemolition measurement of light field intensity to a precise measurement of photon number is described using a generalized measurement postulate. In the intermediate regime, quantization appears as a weak modulation of measurement probability. In this regime, the measurement result is strongly correlated with the amount of phase decoher...

Robust Noise Reduction and Echo Cancellation

Improved image speckle noise reduction and novel dispersion cancellation in Optical Coherence Tomography

Optical coherence tomography (OCT) is an innovative modern biomedical imaging technology that allows in-vivo, non-invasive imaging of biological tissues. At present, some of the major challenges in OCT include the need for fast data acquisition system for probing fast developing biochemical processes in biological tissue, for image processing algorithms to reduce speckle noise and to remove mot...

Nonclassical light from a large number of independent single-photon emitters

Nonclassical quantum effects gradually reach domains of physics of large systems previously considered as purely classical. We derive a hierarchy of operational criteria suitable for a reliable detection of nonclassicality of light from an arbitrarily large ensemble of independent single-photon emitters. We show, that such large ensemble can always emit nonclassical light without any phase refe...