Real-time shaping of entangled photons by classical control and feedback.

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ID: 171669
2020
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Abstract
Quantum technologies hold great promise for revolutionizing photonic applications such as cryptography. Yet, their implementation in real-world scenarios is challenging, mostly because of sensitivity of quantum correlations to scattering. Recent developments in optimizing the shape of single photons introduce new ways to control entangled photons. Nevertheless, shaping single photons in real time remains a challenge due to the weak associated signals, which are too noisy for optimization processes. Here, we overcome this challenge and control scattering of entangled photons by shaping the classical laser beam that stimulates their creation. We discover that because the classical beam and the entangled photons follow the same path, the strong classical signal can be used for optimizing the weak quantum signal. We show that this approach can increase the length of free-space turbulent quantum links by up to two orders of magnitude, opening the door for using wavefront shaping for quantum communications.
Reference Key
lib2020realtimescience Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lib, Ohad;Hasson, Giora;Bromberg, Yaron;
Journal Science advances
Year 2020
DOI
eabb6298
URL
Keywords
elliptic curve cryptography (ecc) elliptic curve point multiplication (ecpm) simple power analysis (spa) attacks twisted edwards curve unified point addition

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