Optical transmitter for time-bin encoding quantum key distribution

Author:

Morales Julián12,Aparicio M. Guadalupe2,Longo Carlos F.3,Arrieta Cristian L.3,Larotonda Miguel A.123

Affiliation:

1. UNIDEF

2. Universidad de Buenos Aires

3. Ministerio de Defensa

Abstract

We introduce an electro-optical arrangement that can produce time-bin encoded symbols with the decoy state method over a standard optical fiber in the C-band telecom window. The device consists of a specifically designed pulse pattern generator for pulse production and a field-programmable gate array that controls timing and synchronization. The electrical pulse output drives a sequence of intensity modulators acting on a continuous laser that deliver bursts of weak optical pulse pairs of discrete intensity values. Such a transmitter allows for the generation of all the quantum states needed to implement a discrete variable quantum key distribution (QKD) protocol over a single-mode fiber channel. Symbols are structured in bursts; the minimum relative delay between pulses is 1.25 ns, and the maximum symbol rate within a burst is 200 MHz. We tested the transmitter on simulated optical channels of  7 dB and 14 dB loss, obtaining maximum extractable secure key rates of 3.0 kb/s and 0.57 kb/s, respectively. Time-bin-state parameters such as the symbol rate, pulse separation, and intensity ratio between the signal and decoy states can be easily accessed and changed, allowing the transmitter to adapt to different experimental conditions and contributing to the standardization of QKD implementations.

Funder

Fondo para la Investigación Científica y Tecnológica

Consejo Nacional de Investigaciones Científicas y Técnicas

Ministerio de Defensa, Argentina

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics

Reference46 articles.

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