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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Turbulence-free space-time quantum imaging

Ronald E. Meyers, Keith S. Deacon, Arnold D. Tunick

Published Sep 26, 2013• 4 citations
Publisher

Abstract

We experimentally demonstrate turbulence-free space-time quantum imaging. Quantum images of remote objects are produced with two sensors measuring at different space-time points under turbulent conditions. The quantum images generated move depending on the time delay between the two sensor measurements and the speed of a rotating ground glass that is part of a chaotic laser light source. For small delay times turbulence has virtually no adverse affect on the moving quantum images. The experimental setup and findings contribute to understanding the fundamentals of multi-photon quantum interference in complex media. Furthermore, the space-time memory demonstrated in our research provides important new pathways for investigating quantum imaging, quantum information storage and quantum computing. The turbulence-free space-time quantum imaging procedure greatly increases the information content of each photon measured. The moved quantum images are in fact new images that are stored in a space-time virtual memory process. The images are stored within the same quantum imaging data sets and thus quantum imaging can produce more information per photon measured than was previously realized.

DOI
10.1117/12.2028191

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We experimentally demonstrate turbulence-free space-time quantum imaging. Quantum images of remote objects are produced with two sensors measuring at different space-time points under turbulent conditions. The quantum images generated move depending on the time delay between the two sensor measurements and the speed of a rotating ground glass that is part of a chaotic laser light source. For small delay times turbulence has virtually no adverse affect on the moving quantum images. The experimental setup and findings contribute to understanding the fundamentals of multi-photon quantum interference in complex media. Furthermore, the space-time memory demonstrated in our research provides important new pathways for investigating quantum imaging, quantum information storage and quantum computing. The turbulence-free space-time quantum imaging procedure greatly increases the information content of each photon measured. The moved quantum images are in fact new images that are stored in a space-time virtual memory process. The images are stored within the same quantum imaging data sets and thus quantum imaging can produce more information per photon measured than was previously realized.
We report on an experimental demonstration of quantum imaging where the images are stored in both space and time. Quantum images of remote objects are produced with rotating ground glass induced chaotic laser light and two sensors measuring at different space-time points. Quantum images are observed to move depending on the time delay between the sensor measurements. The experiments provide a new testbed for exploring the time and space scale fundamental physics of quantum imaging and suggest new pathways for quantum information storage and processing. The moved quantum images are in fact new images that are stored in a space-time virtual memory process. The images are stored within the same quantum imaging data sets and thus quantum imaging can produce more information per photon measured than was previously realized.
We report on an experimental and theoretical investigation of quantum imaging where the images are stored in both space and time. Ghost images of remote objects are produced with either one or two beams of chaotic laser light generated by a rotating ground glass and two sensors measuring the reference field and bucket field at different space-time points. We further observe that the ghost images translate depending on the time delay between the sensor measurements. The ghost imaging experiments are performed both with and without turbulence. A discussion of the physics of the space-time imaging is presented in terms of quantum nonlocal two-photon analysis to support the experimental results. The theoretical model includes certain phase factors of the rotating ground glass. These experiments demonstrated a means to investigate the time and space aspects of ghost imaging and showed that ghost imaging contains more information per measured photon than was previously recognized where multiple ghost images are stored within the same ghost imaging data sets. This suggests new pathways to explore quantum information stored not only in multi-photon coincidence information but also in time delayed multi-photon interference. The research is applicable to making enhanced space-time quantum images and videos of moving objects where the images are stored in both space and time.
We experimentally demonstrate quantum imaging where the images are stored in both space and time. Quantum images of remote objects are produced with either one or two beams of chaotic laser light and two sensors measuring the reference field and bucket field at different space-time points. Chaotic laser light is produced by laser light passing through rotating ground glass. Experiments were performed in both turbulent and nonturbulent conditions. Interestingly, quantum images are produced using the two sensors of quantum imaging when both single and double beams are implemented in the experimental setup. Also, we observed that the quantum images move depending on the time delay between the sensor measurements. The experiments provide a new testbed for exploring the time and space scale fundamental physics of quantum imaging and suggest new pathways for quantum information storage and processing. The research is applicable to making ghost imaging movies of moving objects and implementation of space-time imaging for enhanced imaging.
Turbulence is a serious problem for long distance imaging such as from satellites or ground based telescopes. In this paper we discuss our turbulence-free ghost imaging1 approach that is virtually free from the degrading effects of turbulence. We discuss motivation for the experiments, theory, experimental setup, procedures, and results. The results suggest that thermal two-photon interference may not only be used to improve imaging through turbulence but may also lead to a resource for quantum information processing.
Various quantum imaging techniques have been shown to be effective at imaging through some aspects of traditionally difficult free-space channels, including ghost imaging through turbulent channels, or quantum illumination through channels with noisy backgrounds. While effective, these techniques have only ever been shown to work independently, whereas real-world free-space channels are often both turbulent and noisy. This work experimentally demonstrates that quantum correlated imaging using an SPDC source and a time-tagging camera can be made robust against both turbulent media and a noisy background in free-space channels by implementing filtering based on the temporal and spatial correlations of paired photons. Furthermore, the filtering reduces accidental coincidence counts between uncorrelated photons, allowing the pair source to operate at high brightness which, in turn, leads to video-rate integration times. These quantum correlated recordings allow for improved object tracking, while the longer integration time images improve image fidelity over turbulent and noisy channels. This demonstration could allow for new improvements in communication, measurement, and sensing through turbulent and noisy free-space channels.
As an important part of underwater optical technology, underwater imaging plays a crucial role in accurately capturing underwater targets and environmental features. Facing the challenges of complex ocean environments and severe photon attenuation, quantum imaging breaks through the limitations of traditional optical imaging technology by utilizing the characteristics of two-photon entanglement and time-space correlation, thus offering a new perspective on ocean turbulence. To this end, we propose a new underwater entangled-photon quantum imaging system. Specifically, we first construct an entangled photon quantum imaging physical model through ocean long-exposure turbulence and then exploit an entangled light coincidence imaging reconstruction method to image the target object. Furthermore, in response to the problem that ocean environment has a great impact on photons, we develop a photon capture probability method based on entangled photon pairs to reduce the impact of the ocean turbulence noise on imaging and improve the underwater target imaging resolution. We experimentally demonstrate the effectiveness of our method by showing that even in harsh ocean environments, quantum imaging performs superior resolution capabilities over traditional light source imaging techniques.