Complex Photonics Lab
@ComplexPhoton
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We are the Complex Photonics group at @HebrewU. Studying quantum and classical light in complex photonic systems. Principal investigator - Prof. Yaron Bromberg.
Jerusalem, Israel
Joined September 2022
Check out our new preprint on the "Two-Photon Bandwidth of Hyper-Entangled Photons in Complex Media"! @RonenShekel @OhadLib @WFShaping @BrombergYaron We show that the bandwidth of hyper-entangled photons is much larger than their classical counterpart. A thread 🧵.
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9/ This brings us all the way back to our previous work on Fundamental bounds of wavefront shaping of spatially entangled photons: https://t.co/GdttmvSUzV
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8/ Interestingly, if the SLM is placed before the multimode fiber – the cancellation effect is ruined. To perform wavefront shaping we must place the SLM after the multimode fiber!
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7/Why does this matter? Control. A high-contrast pattern is the key prerequisite for wavefront shaping. We demonstrate numerically that this cancellation allows for broadband wavefront shaping of quantum states, overcoming the severe classical spectral limitations.
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6/ Once again, with hyper-entangled photons the phase-wrapping effect is cancelled, and all coincidence events occur at the m=2 diffraction order.
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5/ We also look at blazed gratings – a cornerstone example of spatio-temporal effects. Also here there are two effects: a) The rainbow that appears at each diffraction order – a geometric effect due to diffraction. b) Leakage to other diffraction orders due to phase wrapping.
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4/ We show that while the geometric effect due to diffraction remains, the phase-wrapping effect is cancelled with hyper-entangled photons, resulting with a high contrast speckle on the optical axis.
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3/ Also thin diffusers have a finite spectral correlation width, where two effects are involved: a) The wavelength dependence of diffraction, leading to exploding speckle. b) Different wavelengths experiencing a different phase landscape after 2pi phase wrapping.
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2/We ask: What happens with hyper-entangled photons – pairs entangled in both space and frequency? We demonstrate a novel "modal dispersion cancellation" effect: the chromatic dispersion experienced by one photon is canceled to first order by its spectrally anti-correlated twin.
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1/ Link: https://t.co/1NFZoasMmF When coherent light propagates through a multimode fiber, the output speckle pattern is highly sensitive to wavelength. This "spectral correlation width" fundamentally limits the bandwidth for imaging and communication.
arxiv.org
When light propagates through complex media, its output spatial distribution is highly sensitive to its wavelength. This fundamentally limits the bandwidth of applications ranging from imaging to...
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https://t.co/GdttmvSmKn And if you prefer hearing the short talk version (14 minutes): https://t.co/pKrYBhMzGY
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Our paper has just been published on APL photonics, and has been chosen as a featured article! Check out the new section, discussing how these results apply for a state that is not maximally entangled. link below
Check out our new preprint on the Fundamental Bounds of Wavefront Shaping of Spatially Entangled Photons! @RonenShekel @WFShaping @BrombergYaron We show that classical wavefront shaping does not tell the whole story. A thread 🧵.
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Check out my recent talk about quantum wavefront shaping :) https://t.co/P9zveWLXck Full paper here:
arxiv.org
Wavefront shaping enables control of classical light through scattering media. Extending these techniques to spatially entangled photons promises new quantum applications, but their fundamental...
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14/ Read the paper for the full details and let us know what you think! https://t.co/ZlDrHJIMFz
arxiv.org
Wavefront shaping enables control of classical light through scattering media. Extending these techniques to spatially entangled photons promises new quantum applications, but their fundamental...
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13/ We also analyze what happens under incomplete control, and show that the results are rather robust. We also show that in the regime of limited control, we get interesting analogs to coherent back-scattering.
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12/ Also in two-photon detection shaping the special case where both photons are measured in the same mode is special, resulting with η ≈ N for the unitary case, and η ≈ 4.6N (!!) for the Gaussian IID case.
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11/ Energy is conserved, since in the Gaussian IID case light that would otherwise be scattered to unmeasured modes (e.g. reflected) is now transmitted through the scattering medium.
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