OFDM for Frequency Coded Quantum Key Distribution

Anandan, M.; Choudhary, Santosh Kumar; Kumar, Karthik

doi:10.1364/photonics.2012.w2a.6

Cited by 2 publications

(1 citation statement)

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“…To our knowledge, FDMA, or equivalently, the so-called wavelength-division multiple access (WDMA), has been used for quantum key distribution (QKD) [31][32][33][34][35][36][37], in which classical information is transmitted over quantum network, and TDMA has been used to generate large entangled cluster states [38]. However, whether more popular classical communication technique such as CDMA [41][42][43][44] and OFDMA [39,40] can be applied to quantum communication systems is still an interesting problem yet to be solved.…”

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confidence: 99%

Entanglement distribution over quantum code-division multiple-access networks

et al. 2015

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We present a method for quantum entanglement distribution over a so-called code-divisionmultiple-access network, in which two pairs of users share the same quantum channel to transmit information. The main idea of this method is to use different broad-band chaotic phase shifts, generated by electro-optic modulators (EOMs) and chaotic Colpitts circuits, to encode the informationbearing quantum signals coming from different users, and then recover the masked quantum signals at the receiver side by imposing opposite chaotic phase shifts. The chaotic phase shifts given to different pairs of users are almost uncorrelated due to the randomness of chaos and thus the quantum signals from different pair of users can be distinguished even when they are sent via the same quantum channel. It is shown that two maximally-entangled states can be generated between two pairs of users by our method mediated by bright coherent lights, which can be more easily implemented in experiments compared with single-photon lights. Our method is robust under the channel noises if only the decay rates of the information-bearing fields induced by the channel noises are not quite high. Our study opens up new perspectives for addressing and transmitting quantum information in future quantum networks.

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