We present quantum key distribution schemes which are
autocompensating (require no alignment) and symmetric (Alice and
Bob receive photons from a central source) for both polarization
and time-bin qubits. 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 both the polarization and the
time-bin schemes may be implemented with existing technology. The
new schemes are related to previously described schemes by the
concept of advanced waves.
We present a new quantum cryptography implementation that uses
frequency-correlated photon pairs to combine one-way operation
with an autocompensating feature that has hitherto only been
available in implementations that require the signal to make a
round trip between the users. Furthermore, we describe a new
scheme for creating frequency-correlated photon pairs
(auto-phase-matched spontaneous parametric down-conversion). The
new scheme offers several advantages over previous schemes,
including the ability to generate frequency-correlated photon
pairs regardless of the dispersion characteristics of the
system.
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