Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Imaging and Applied Optics

Improved Phase Retrieval in Quantum Imaging by Filtering of Spatial Entanglement

Chien-Hung Lu, Jason W. Fleischer

Published Jan 1, 2015• 0 citations
Publisher

Abstract

We adjust the geometry of quantum illumination so that detection in an EMCCD camera corresponds to coincident counting of entangled photon pairs. With appropriate filtering, improved quantum phase imaging is demonstrated.
DOI
10.1364/cosi.2015.cth1e.2

Related papers

Quantum imaging and spatial entanglement characterization with an EMCCD camera

Matthew C. Reichert, Hugo Defienne, Xiaohang Sun +1 more

We utilize a single-photon sensitive electron multiplying CCD camera as a massively parallel coincidence counting apparatus to study spatial entanglement of photon pairs. This allows rapid measurement of transverse spatial entanglement in a fraction of the time required with traditional point-scanning techniques. We apply this technique to quantum experiments on entangled photon pairs: characterization of the evolution of entanglement upon propagation, and measurement of one- and two-photon portions of the state transmitted through non-unitary (lossy) objects, and quantum phase imaging.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 8, 2017•0 citations

Quantum Imaging of Non-Unitary Objects with Spatially Entangled Photon Pairs

Matthew C. Reichert, Hugo Defienne, Xiaohang Sun +1 more

We image one- and two-photon parts of the state of entangled photon pairs transmitted through lossy objects using an EMCCD camera and demonstrate that the one-photon intensity contains information on the degree of spatial entanglement.

Imaging and Applied Optics•Jan 1, 2017•0 citations

Quantum Phase Imaging using Spatial Entanglement

Chien-Hung Lu, Matthew C. Reichert, Sun, Xiaohang +1 more

Entangled photons have the remarkable ability to be more sensitive to signal and less sensitive to noise than classical light. Joint photons can sample an object collectively, resulting in faster phase accumulation and higher spatial resolution, while common components of noise can be subtracted. Even more, they can accomplish this while physically separate, due to the nonlocal properties of quantum mechanics. Indeed, nearly all quantum optics experiments rely on this separation, using individual point detectors that are scanned to measure coincidence counts and correlations. Scanning, however, is tedious, time consuming, and ill-suited for imaging. Moreover, the separation of beam paths adds complexity to the system while reducing the number of photons available for sampling, and the multiplicity of detectors does not scale well for greater numbers of photons and higher orders of entanglement. We bypass all of these problems here by directly imaging collinear photon pairs with an electron-multiplying CCD camera. We show explicitly the benefits of quantum nonlocality by engineering the spatial entanglement of the illuminating photons and introduce a new method of correlation measurement by converting time-domain coincidence counting into spatial-domain detection of selected pixels. We show that classical transport-of-intensity methods are applicable in the quantum domain and experimentally demonstrate nearly optimal (Heisenberg-limited) phase measurement for the given quantum illumination. The methods show the power of direct imaging and hold much potential for more general types of quantum information processing and control.

arXiv:1509.01227•Sep 3, 2015•1 citation

Imaging the Joint Probability Distribution of Spatially Entangled Photon Pairs with a Camera

Matthew C. Reichert, Hugo Defienne, Jason W. Fleischer

We present massively parallel coincidence counting of entangled photon pairs by measuring coincidences between all pairs of pixels in a single-photon-sensitive camera, including the case where both entangled photons arrive in the same pixel.

Imaging and Applied Optics•Jan 1, 2018•0 citations

Optimizing Coincidence Measurements of Entangled Photons

Matthew C. Reichert, Hugo Defienne, Jason W. Fleischer

We present the general SNR of coincidence measurements of joint probability of entangled-photon-pairs. Experiments with an EMCCD camera show excellent agreement for count rates up to saturation, and an optimum based on electronic noise.

Frontiers in Optics•Jan 1, 2017•0 citations

Quantum Imaging of a Polarisation Sensitive Phase Pattern with Hyper-entangled Photons

Manpreet Kaur, Mandip Singh

A photon of entangled photons pair interacts with a transparent phase pattern that introduces position dependent shift in polarisation state of photon. A coincidence imaging camera, incorporating measurement outcomes of non-interacting photon generates quantum image.

Frontiers in Optics•Jan 1, 2022•1 citation
We utilize a single-photon sensitive electron multiplying CCD camera as a massively parallel coincidence counting apparatus to study spatial entanglement of photon pairs. This allows rapid measurement of transverse spatial entanglement in a fraction of the time required with traditional point-scanning techniques. We apply this technique to quantum experiments on entangled photon pairs: characterization of the evolution of entanglement upon propagation, and measurement of one- and two-photon portions of the state transmitted through non-unitary (lossy) objects, and quantum phase imaging.
Entangled photons have the remarkable ability to be more sensitive to signal and less sensitive to noise than classical light. Joint photons can sample an object collectively, resulting in faster phase accumulation and higher spatial resolution, while common components of noise can be subtracted. Even more, they can accomplish this while physically separate, due to the nonlocal properties of quantum mechanics. Indeed, nearly all quantum optics experiments rely on this separation, using individual point detectors that are scanned to measure coincidence counts and correlations. Scanning, however, is tedious, time consuming, and ill-suited for imaging. Moreover, the separation of beam paths adds complexity to the system while reducing the number of photons available for sampling, and the multiplicity of detectors does not scale well for greater numbers of photons and higher orders of entanglement. We bypass all of these problems here by directly imaging collinear photon pairs with an electron-multiplying CCD camera. We show explicitly the benefits of quantum nonlocality by engineering the spatial entanglement of the illuminating photons and introduce a new method of correlation measurement by converting time-domain coincidence counting into spatial-domain detection of selected pixels. We show that classical transport-of-intensity methods are applicable in the quantum domain and experimentally demonstrate nearly optimal (Heisenberg-limited) phase measurement for the given quantum illumination. The methods show the power of direct imaging and hold much potential for more general types of quantum information processing and control.