Abstract
We present an autocompensating quantum cryptography technique for Measurement-Device-Independent quantum cryptography devices with different kind of optical fiber modes. We center our study on collinear spatial modes in few-mode optical fibers by using both fiber and micro-optical components. We also indicate how the obtained results can be easily extended to polarization modes in monomode optical fibers and spatial codirectional modes in multicore optical fibers.
Highlights
Quantum cryptography is based on the properties of quantum mechanics to obtain secure quantum key distribution (QKD) by using different protocols
In this work we propose an autocompensating quantum cryptography technique for two-photon quantum states, and in particular Autocompensating MDI-QKD (A-MDI-QKD)
We study in detail two collinear modes of a few-mode optical fiber by using both fiber and micro-optical components
Summary
Quantum cryptography is based on the properties of quantum mechanics to obtain secure quantum key distribution (QKD) by using different protocols. Different optical fiber systems have been proposed to implement QKD cryptography. Such systems can use different kind of modes, for instance, polarization modes in monomode optical fibers, spatial collinear modes in few-mode optical fibers (FMF) and spatial codirectional modes in multicore optical fibers. Mode instability is due to the modal coupling undergone by the modes in their propagation along real optical fibers with small imperfections or (slow) temporal perturbations. To overcome this drawback polarization autocompensating techniques have been proposed in cryptography with single-photon quantum states [2]. The photonic devices are analogous to those ones used in 1-qudit cryptography [3]
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