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Reference.org
Six-state protocol
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<p>The six-state protocol (SSP) is the <a href="/facts/Quantum_cryptography/FPqPdNXT">quantum cryptography</a> protocol that is the version of <a href="/facts/BB84/8d2G3lfC">BB84</a> that uses a six-state polarization scheme on three orthogonal bases. </p>