Channel models for QKD at higher photon flux levels based on spatial entanglement of twin beams in PDC

Marina Mondin; Fred Daneshgaran; I. P. Degiovanni; M. Genovese; I. Ruo Berchera

doi:10.1117/12.2191537

1 September 2015 Channel models for QKD at higher photon flux levels based on spatial entanglement of twin beams in PDC

Marina Mondin, Fred Daneshgaran, I. P. Degiovanni, M. Genovese, I. Ruo Berchera

Proceedings Volume 9615, Quantum Communications and Quantum Imaging XIII; 96150A (2015) https://doi.org/10.1117/12.2191537
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

One of the key issues in QKD is the rather limited data rate at which the secret key can be generated. This paper explores the use of quantum correlation associated with twin beams in Parametric Down Conversion (PDC) to in effect create a number of parallel channels for generation of secret keys, thus significantly boosting the achievable key rate. Such quantum correlations have been effectively used as a tool for many applications, including calibration of single photon detectors and QKD applications.¹ Within QKD applications, the natural setup of quantization of Charge Coupled Device (CCD) detection areas and subsequent measurement of the correlation statistic needed to detect the presence of the eavesdropper Eve, leads to a set of QKD parallel channel models that are either binary or multilevel Discrete Memoryless Channels (DMC). This work explores the derivation of proper channel models for this application starting from measured data and the optimization of the secret key rate. Analytical results based on measurements performed on a 30 pixel image suggest that nearly an 8-fold increase in secret key rate may be achievable using this technique.

Citation Download Citation

Marina Mondin, Fred Daneshgaran, I. P. Degiovanni, M. Genovese, and I. Ruo Berchera "Channel models for QKD at higher photon flux levels based on spatial entanglement of twin beams in PDC", Proc. SPIE 9615, Quantum Communications and Quantum Imaging XIII, 96150A (1 September 2015); https://doi.org/10.1117/12.2191537

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