{"id":394804,"date":"2023-12-22T14:10:31","date_gmt":"2023-12-22T19:10:31","guid":{"rendered":"https:\/\/platohealth.ai\/images-hidden-in-noise-revealed-by-a-quantum-inspired-method\/"},"modified":"2023-12-23T08:03:03","modified_gmt":"2023-12-23T13:03:03","slug":"images-hidden-in-noise-revealed-by-a-quantum-inspired-method","status":"publish","type":"post","link":"https:\/\/platohealth.ai\/images-hidden-in-noise-revealed-by-a-quantum-inspired-method\/","title":{"rendered":"Images hidden in noise revealed by a quantum-inspired method","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
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Researchers at the University of Warsaw\u2019s Faculty of Physics with colleagues from Stanford University and Oklahoma State University have introduced a quantum-inspired phase imaging method based on light intensity correlation measurements that is robust to phase noise. The results of the research have been published in the prestigious journal \u201cScience Advances\u201d. The new imaging method can operate even with extremely dim illumination and can prove useful in emerging applications such as in infrared and X-ray interferometric imaging and quantum and matter-wave interferometry.<\/em><\/p>\n

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Researchers at the University of Warsaw\u2019s Faculty of Physics with colleagues from Stanford University and Oklahoma State University have introduced a quantum-inspired phase imaging method based on light intensity correlation measurements that is robust to phase noise. The results of the research have been published in the prestigious journal \u201cScience Advances\u201d. The new imaging method can operate even with extremely dim illumination and can prove useful in emerging applications such as in infrared and X-ray interferometric imaging and quantum and matter-wave interferometry.<\/em><\/p>\n

No matter if you take photos of a cat with your smartphone or image cell cultures with an advanced microscope, you do this by measuring the intensity (brightness) of light pixel by pixel. Light is characterized, not only by its intensity but also by its phase. Interestingly, transparent objects can become visible if you\u2019re able to measure the phase delay of light that they introduce. Phase contrast microscopy, for which Frits Zernike received a Nobel Prize in 1953, brought about a revolution in biomedical imaging due to the possibility of obtaining high-resolution images of various transparent and optically thin samples. The research field that emerged from Zernike\u2019s discovery includes modern imaging techniques such as digital holography and quantitative phase imaging. \u201cIt enables label-free and quantitative characterization of living specimens, such as cell cultures, and can find applications in neurobiology or cancer research\u201d explains Dr Radek Lapkiewicz, head of the Quantum Imaging Laboratory at the University of Warsaw\u2019s Faculty of Physics.<\/p>\n

However, there is still room for improvement. \u201cFor example, interferometry, a standard measurement method for precise thickness measurements at any point of the examined object, only works when the system is stable, not subject to any shocks or disturbances. It is very challenging to carry out such a test, for example, in a moving car or on a shaking table,\u201d explains Jerzy Szuniewcz, a doctoral student at the University of Warsaw\u2019s Faculty of Physics. Researchers from the Faculty of Physics at the University of Warsaw with colleagues from Stanford University and Oklahoma State University decided to tackle this problem and develop a new method of phase imaging that is immune to phase instability. The results of their research have been published in the prestigious journal \u201cScience Advances\u201d.<\/p>\n

Back to the old school<\/strong><\/p>\n

How did the researchers come up with the idea for the new technique? Already in the 60\u2019s Leonard Mandel and his group demonstrated that even when interference is not detectable in intensity, correlations can reveal its presence. \u201cInspired by the classic experiments of Mandel, we wanted to investigate how intensity correlation measurements can be used for phase imaging\u201d explains Dr Lapkiewicz. In a correlation measurement we look at pairs of pixels and observe whether they become brighter or darker at the same time. \u201cWe have shown that such measurements contain additional information that cannot be obtained using a single photo, i.e. intensity measurement. Using this fact, we demonstrated that in phase microscopy based on interference, observations are possible even when standard interferograms average out losing all the phase information  and there are no fringes recorded  in the intensity. With a standard approach, one would assume that there is no useful information in such an image. However, it turns out that the information is hidden in the correlations and can be recovered by analyzing multiple independent photos of an object allowing us to obtain perfect interferograms, even though the ordinary interference is undetectable due to the noise\u201d adds Lapkiewicz.<\/p>\n

\u201cIn our experiment, the light  which passes through a phase object (our target, which we want to investigate)  is superposed with a reference light. A random phase delay  is introduced between the object and reference light beams  \u2013 this phase delay simulates a disturbance obstructing the standard phase imaging methods. Consequently, no interference is observed when the intensity is measured, that is, no information about the phase object can be obtained from intensity measurements. However, the spatially dependent intensity-intensity correlation displays a fringe pattern that contains the complete information about the phase object. This intensity-intensity correlation is unaffected by any temporal phase noise varying slower then the speed of the detector (~10 nanoseconds in the performed experiment)and can be measured by accruing data over an arbitrarily long period of time \u2013 which is a game changer \u2013 longer measurement means more photons, which translates to higher accuracy.\u201d explains Jerzy Szuniewicz, the first author of the work. Put simply, if we were to record a single film frame, that single frame would give us no useful information about what the object under study looks like. \u201cTherefore, first we recorded a whole series of such frames using a camera and then multiplied the measurement values at each pair of points from every frame. We averaged these correlations, and recorded a full image of our object,\u201d explains Jerzy Szuniewicz. \u201cThere are many possible ways to recover the phase profile of an observed object from a sequence of images. However, we proved that our method based on intensity-intensity correlation and a so-called off-axis holography technique provides an optimal reconstruction precision\u201d says Stanis\u0142aw Kurdzia\u0142ek, the second author of the paper.<\/p>\n

A bright idea for dark environments<\/strong><\/p>\n

A phase imaging approach based on intensity correlation can be widely used in very noisy environments. The new method works with both classical (laser and thermal) and quantum light. It can also be implemented in the photon counting regime, for example using single photon avalanche diodes. \u201cWe can use it in cases where there is little light available or when we cannot use high light intensity so as not to damage the object, for example a delicate biological sample or a work of art,\u201d explains Jerzy Szuniewicz.<\/p>\n

\u201cOur technique will broaden prospects in phase measurements, including emerging applications such as in infrared and X-ray imaging and quantum and matter-wave interferometry\u201d concludes Dr Lapkiewicz.<\/p>\n

This work was supported by the Foundation for Polish Science under the FIRST TEAM project \u201cSpatiotemporal photon correlation measurements for quantum metrology and super-resolution microscopy\u201d co-financed by the European Union under the European Regional Development Fund (POIR.04.04.00-00-3004\/17-00). Jerzy Szuniewicz also acknowledges support from the National Science Centre, Poland, grant number 2022\/45\/N\/ST2\/04249. S. Kurdzialek acknowledges support from the National Science Center (Poland) grant No.2020\/37\/B\/ST2\/02134. M.ahiri. acknowledges support from the U.S. Office of Naval Research under award number N00014-23-1-2778.<\/p>\n

Faculty of Physics of the University of Warsaw<\/strong><\/p>\n

Physics and astronomy at the University of Warsaw appeared in 1816 as part of the then Faculty of Philosophy. In 1825, the Astronomical Observatory was established. Currently, the Faculty of Physics at the University of Warsaw consists of the following institutes: Experimental Physics, Theoretical Physics, Geophysics, the Department of Mathematical Methods and the Astronomical Observatory. The research covers almost all areas of modern physics, on scales from quantum to cosmological. The Faculty\u2019s research and teaching staff consists of over 250 academic teachers. About 1,100 students and over 170 doctoral students study at the Faculty of Physics UW. The University of Warsaw is among the 150 best universities in the world educating in the field of physics according to the Shanghai\u2019s Global Ranking of Academic Subjects.<\/p>\n

SCIENTIFIC PUBLICATION:<\/u><\/strong><\/p>\n

J. Szuniewicz, S. Kurdzialek, S. Kundu, W. Zwolinski, R. Chrapkiewicz, M. Lahiri, R. Lapkiewicz, Noise-resistant phase imaging with intensity correlation, <\/em> Science Advances 9(38) DOI:10.1126\/sciadv.adh5396<\/p>\n

CONTACT:<\/u><\/strong><\/p>\n

MSc Jerzy Szuniewicz  
Faculty of Physics University of Warsaw
[email protected]<\/a>
phone +48 22 55 32 747<\/p>\n

Dr Radek Lapkiewicz
Faculty of Physics University of Warsaw
[email protected]<\/a>
phone +48 22 55 32 740<\/p>\n

RELATED WEBSITES WWW:<\/u><\/strong><\/p>\n

https:\/\/www.fuw.edu.pl\/faculty-of-physics-home.html
Website of the Faculty of Physics University of Warsaw<\/p>\n

https:\/\/www.fuw.edu.pl\/press-releases.html
Press service of the Faculty of Physics at the University of Warsaw<\/p>\n

http:\/\/quantumimaging.fuw.edu.pl\/
Quantum Imaging Lab, Faculty of Physics, University of Warsaw<\/p>\n

GRAPHIC MATERIALS:<\/u><\/strong><\/p>\n

FUW231222b_img01<\/u><\/strong><\/p>\n

https:\/\/www.fuw.edu.pl\/tl_files\/press\/images\/2023\/FUW231222b_img01.jpg<\/u><\/strong><\/p>\n


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Journal<\/h4>\n

Science Advances<\/p>\n<\/p><\/div>\n

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DOI<\/h4>\n

10.1126\/sciadv.adh5396 <\/i><\/p>\n<\/p><\/div>\n

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Article Title<\/h4>\n

Noise-resistant phase imaging with intensity correlation<\/p>\n<\/p><\/div>\n

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Article Publication Date<\/h4>\n

22-Oct-2023<\/p>\n<\/p><\/div>\n<\/div>\n<\/div>\n<\/div>\n