Abstract
We present a workbench for the study of real-time quantum imaging by measuring the frame-by-frame quantum noise reduction of multi-spatial-mode twin beams generated by four wave mixing in Rb vapor. Exploiting the multiple spatial modes of this squeezed light source, we utilize spatial light modulators to selectively pass macropixels of quantum correlated modes from each of the twin beams to a high quantum efficiency balanced detector. In low-light-level imaging applications, the ability to measure the quantum correlations between individual spatial modes and macropixels of spatial modes with a single pixel camera will facilitate compressive quantum imaging with sensitivity below the photon shot noise limit.
Highlights
Quantum imaging, which is based on the control of images in quantum systems, has been a topic of growing interest in recent years [1,2,3,4,5]
Quantum noise reduction (QNR) - or squeezed light - can be exploited in low-light-intensity imaging applications in order to achieve increased sensitivity and contrast beyond the shot noise limit (SNL) by reducing the uncertainty in photon number at the expense of the uncertainty in phase
Because the quantum noise reduction observed in individual coherence areas within an image is highly dependent on the pump-probe overlap, the observed squeezing is expected to be smaller for images with higher order spatial frequencies that would yield poor overlap at the Fourier plane in the vapor cell
Summary
Quantum imaging, which is based on the control of images in quantum systems, has been a topic of growing interest in recent years [1,2,3,4,5]. The ability to perform sub-shot-noise imaging with a more economical, high quantum efficiency, single pixel detector with a dramatically reduced overall integration time will facilitate real-time high-sensitivity imaging in low-light situations. In this manuscript, we demonstrate real-time control of the spatial modes in a squeezed light source by incorporating a spatial light modulator (SLM) into the seed beampath prior to the generation of multi-spatial-mode squeezed light by four-wave mixing (4WM) in 85Rb vapor. We demonstrate compressive sampling of the beam profiles using a customized sampling matrix suited to twin beam detection
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