MSZ96 is a quantum key distribution protocol which allows a cryptographic key bit to be encoded using four nonorthogonal quantum states described by non-commuting quadrature phase amplitudes of a weak optical field, without photon polarization (BB84 protocol) or entangled photons (E91 protocol).[1]


  1. Mu, Yi; Seberry, Jennifer; Zheng, Yuliang (15 January 1996). "Shared cryptographic bits via quantized quadrature phase amplitudes of light" (PDF). Optics Communications. 123 (1–3): 344–352. Bibcode:1996OptCo.123..344M. CiteSeerX doi:10.1016/0030-4018(95)00688-5.
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