Using symmetrized angular asymmetries from simulated H->ZZ*->4l events, the authors reconstruct the ZZ* density matrix and report a positive concurrence lower bound for all scanned SMEFT couplings.
Quantum Cryptography with Entangled Photons
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abstract
By realizing a quantum cryptography system based on polarization entangled photon pairs we establish highly secure keys, because a single photon source is approximated and the inherent randomness of quantum measurements is exploited. We implement a novel key distribution scheme using Wigner's inequality to test the security of the quantum channel, and, alternatively, realize a variant of the BB84 protocol. Our system has two completely independent users separated by 360 m, and generates raw keys at rates of 400 - 800 bits/second with bit error rates arround 3 percent.
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Looking into the quantum entanglement in $H\to ZZ^\star$ at LHC within SMEFT framework
Using symmetrized angular asymmetries from simulated H->ZZ*->4l events, the authors reconstruct the ZZ* density matrix and report a positive concurrence lower bound for all scanned SMEFT couplings.