Observation of Spatial Quantum Correlations in the Macroscopic Regime
arXiv:1611.06445 · doi:10.1103/PhysRevA.95.053849
Abstract
Spatial quantum correlations in the transverse degree of freedom promise to enhance optical resolution, image detection, and quantum communications through parallel quantum information encoding. In particular, the ability to observe these spatial quantum correlations in a single shot will enable such enhancements in applications that require real time imaging, such as particle tracking and in-situ imaging of atomic systems. Here, we report on measurements in the far-field that show spatial quantum correlations in single images of bright twin-beams with photons in a 1~s pulse using an electron-multiplying charge-coupled device camera. A four-wave mixing process in hot rubidium atoms is used to generate narrowband-bright pulsed twin-beams of light. Owing to momentum conservation in this process, the twin-beams are momentum correlated, which leads to spatial quantum correlations in the far field. We show around 2~dB of spatial quantum noise reduction with respect to the shot noise limit. The spatial squeezing is present over a large range of total number of photons in the pulsed twin-beams.
References in corpus (23)
- Quantum information with continuous variables
- Long-distance quantum communication with atomic ensembles and linear optics
- Experimental realization of sub-shot-noise quantum imaging
- Biological measurement beyond the quantum limit
- Observation of squeezed light with 10dB quantum noise reduction
- Single-atom trapping in holographic 2D arrays of microtraps with arbitrary geometries
- Strong low-frequency quantum correlations from a four-wave mixing amplifier
- Real applications of quantum imaging
- Surpassing the standard quantum limit for optical imaging using non-classical multimode light
- Detection of sub-shot-noise spatial correlation in high-gain parametric down-conversion
- Quantum noise and correlations in resonantly enhanced wave mixing based on atomic coherence
- Simultaneous near-field and far field spatial quantum correlations in spontaneous parametric down-conversion
- Generation of spatially broadband twin beams for quantum imaging
- Narrow Band Source of Transform-Limited Photon Pairs via Four-Wave Mixing in a Cold Atomic Ensemble
- Measurement of sub-shot-noise spatial correlations without subtraction of background
- Two-Color Bright Squeezed Vacuum
- Ultra-Narrow Faraday Rotation Filter at the Rb D1 Line
- Absolute emission rates of Spontaneous Parametric Down Conversion into single transverse Gaussian modes
- Quantum correlations by four-wave mixing in an atomic vapor in a non-amplifying regime: a quantum beam splitter for photons
- In situ imaging of vortices in Bose-Einstein condensates
- Experimental study of the spatial distribution of quantum correlations in a confocal Optical Parametric Oscillator
- Quantum mutual information of an entangled state propagating through a fast-light medium
- Violation of the Cauchy-Schwarz Inequality in the Macroscopic Regime
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- Einstein-Podolsky-Rosen Paradox with Position-Momentum Entangled Macroscopic Twin Beams
- Information encoding in the spatial correlations of entangled twin beams
- Twin-beam intensity-difference squeezing below 10 Hz
- Spatial squeezing in bright twin beams generated with four-wave mixing: constraints on characterization with an EMCCD camera
- Comparison of coherence area measurement techniques for bright entangled twin beams
- Degenerate four-wave mixing as a low-power source of squeezed light
- Twin-beam-enhanced displacement measurement of a membrane in a cavity
- Atomic Resonant Single-Mode Squeezed Light from Four-Wave Mixing through Feedforward
- Violation of generalized Bell inequality and its optimal measurement settings
- Low-Light Shadow Imaging using Quantum-Noise Detection with a Camera
- Transport of spatial quantum correlations through an optical waveguide
- Temporal Quantum Noise Reduction Acquired by an Electron-Multiplying Charge-Coupled-Device Camera
- Localized to delocalized spatial quantum correlation evolution in structured bright twin beams
- Mode hitching in traveling-wave optical parametric amplification