A metasurface-based system generates entangled photons and extracts phase gradients to image up to 25 rad/mm with 89% similarity to reference measurements.
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Four-state countermeasure implemented on GHz QKD prototype recovers nearly the ideal secret key rate against detection efficiency mismatch attacks.
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Quantum Phase Gradient Imaging Using a Nonlocal Metasurface System
A metasurface-based system generates entangled photons and extracts phase gradients to image up to 25 rad/mm with 89% similarity to reference measurements.
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Practical Countermeasure Against Attacks Exploiting Detection Efficiency Mismatch in Quantum Key Distribution
Four-state countermeasure implemented on GHz QKD prototype recovers nearly the ideal secret key rate against detection efficiency mismatch attacks.