Noise-Immune Quantum Key Distribution

We review quantum key distribution schemes that are noise-immune (require no alignment). For both polarization and time-bin qubits, we present three noise-immune schemes: round-trip, one-way, and symmetric. In the roundtrip schemes, the signal travels back and forth between the legitimate users (Alice and Bob); in the one-way schemes, the signal travels only from Alice to Bob; in the symmetric schemes, a central source sends signals to Alice and Bob. The primary benefit of the symmetric configuration is that both Alice and Bob may have passive setups (neither Alice nor Bob is required to make active changes for each run of the protocol). We show that all the schemes can be implemented with existing technology. 211 Z. D. Walton, A. V. Sergienko, B. E. A. Saleh, and M. C. Teich, "Noise-Immune Quantum Key Distr bution," in Quantum Communications and Cryptography, edited by A. V. Sergienko (CRC Press, Boca Raton, 2006), ch. 10, pp. 211-224. 212 Quantum Communications and Cryptography

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