Passive state preparation for quantum key distribution with phase encoding

TL;DR

This paper introduces a passive state preparation method for quantum key distribution using phase encoding, employing phase difference measurements of gain-switched laser pulses, supported by computer simulations.

Contribution

It presents a novel passive state preparation technique for QKD with phase encoding, including optical scheme design and simulation validation.

Findings

Effective passive state preparation demonstrated through simulations

Optical scheme for transmitter designed and analyzed

Potential improvements in QKD security and efficiency

Abstract

We propose here a method of passive state preparation for quantum key distribution with phase encoding based on the measurement of the phase difference between pulses of a gain-switched laser. The features of the optical scheme of the transmitter are discussed and the results of computer simulation are presented to demonstrate the effectiveness of the proposed method.