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Sources of entangled photon pairs serve as basis for many quantum information experiments, such as quantum computing or quantum key distribution (QKD). Especially in the field of QKD a popular wavelength combination is 810 and 1550nm, generated by spontaneous parametric down conversion (SPDC). Previous schemes facilitated two nonlinear crystals behind each other, hence limiting the propagation length...
Quantum cryptography circumvents the threat on classical cryptography due to quantum computers. Its integration into WDM transmission systems is a key point in its commercial deployment. The necessary pre-requisites are discussed in this paper.
In this contribution, the authors present a solution to the unitary polarization change of the fiber, which is time-dependent on environmental parameters (e.g. temperature and stress). Classical light (probe signal) is used to follow the polarization drift of the fiber. Furthermore we require that the polarization stabilization procedure does not interfere with the quantum signal.
It is well-known that multi-photon signals in quantum key distribution (QKD) with weak laser pulses represent a security threat resulting in a reduced rate for secret-key production. Similarly, multi-pair contributions from spontaneous-parametric-down-conversion (SPDC) sources may cause information leak. In particular, in the case of polarization coding (i.e., when the polarization of photons is used...
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