Localized to delocalized spatial quantum correlation evolution in structured bright twin beams
arXiv:2511.02268 · doi:10.1103/vng3-fpfk
Abstract
Quantum correlations in the spatial domain hold great promise for applications in quantum imaging, quantum cryptography and quantum information processing, owing to the infinite dimensionality of the associated Hilbert space. Here, we present a theoretical investigation, complemented by experimental measurements, of the propagation dynamics of the spatial quantum correlations in bright structured twin beams generated via a four-wave mixing process in a double- configuration in atomic vapor. We derive an analytical expression describing the evolution of the spatial quantum correlation distribution from the near field to the far field. To qualitatively support the theoretical predictions, we perform experiments measuring intensity-difference noise between different spatial subregions of the twin beams as they propagate from the near field to the far field. The presence of quantum correlations is manifested as squeezing in the intensity difference noise measurement. With a Gaussian pump, we observe localized correlations in the near field and localized anti-correlations in the far field. In contrast, with a structured Laguerre-Gaussian pump, there is a transition from localized correlations in the near field to delocalized correlations in the far field. The present results offer valuable insights into the fundamental behavior of spatial quantum correlations and open possibilities for potential applications in quantum information, quantum imaging and sensing.
13 pages, 8 figures
References in corpus (21)
- Experimental realization of sub-shot-noise quantum imaging
- High-dimensional quantum cryptography with twisted light
- Spatial correlations in parametric down-conversion
- Strong relative intensity squeezing by 4-wave mixing in Rb vapor
- Imaging high-dimensional spatial entanglement with a camera
- Detection of sub-shot-noise spatial correlation in high-gain parametric down-conversion
- Simultaneous near-field and far field spatial quantum correlations in spontaneous parametric down-conversion
- Generation of spatially broadband twin beams for quantum imaging
- Introduction to the Transverse Spatial Correlations in Spontaneous Parametric Down-Conversion through the Biphoton Birth Zone
- Transverse Entanglement Migration in Hilbert Space
- Propagation of transverse intensity correlations of a two-photon state
- Transverse coherence of photon pairs generated in spontaneous parametric down-conversion
- Observation of Spatial Quantum Correlations in the Macroscopic Regime
- Information encoding in the spatial correlations of entangled twin beams
- Spatial squeezing in bright twin beams generated with four-wave mixing: constraints on characterization with an EMCCD camera
- Propagation-induced entanglement revival
- Comparison of coherence area measurement techniques for bright entangled twin beams
- Multi-mode four-wave mixing with a spatially-structured pump
- Transfer of angular spectrum in parametric down-conversion with structured light
- Maximizing the Validity of the Gaussian Approximation for the biphoton State from Parametric Downconversion
- Parallel Quantum-Enhanced Sensing