Use of a Local Local Oscillator for the Satellite-to-Earth Channel

• URL: http://arxiv.org/abs/2010.09399v1
• Date: Mon, 19 Oct 2020 11:39:22 GMT
• Title: Use of a Local Local Oscillator for the Satellite-to-Earth Channel
• Authors: Sebastian Kish, Eduardo Villase\~nor, Robert Malaney, Kerry Mudge, Kenneth Grant
• Abstract summary: Continuous variable quantum key distribution (CV-QKD) offers information-theoretic secure key sharing between two parties. The sharing of a phase reference frame is an essential requirement for coherent detection in CV-QKD. We develop a new noise model of a current state-of-the-art LLO scheme in the context of the satellite-to-Earth channel.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Continuous variable quantum key distribution (CV-QKD) offers information-theoretic secure key sharing between two parties. The sharing of a phase reference frame is an essential requirement for coherent detection in CV-QKD. Due to the potential attacks related to transmitting the local oscillator (LO) alongside quantum signals, there has been a focus on using local LOs (LLOs) to establish a shared phase reference. In this work, we develop a new noise model of a current state-of-the-art LLO scheme in the context of the satellite-to-Earth channel. In doing this, we encapsulate detailed phase-screen calculations that determine the coherent efficiency - a critical parameter in free-space CV-QKD that characterizes the wavefront aberrations caused by atmospheric turbulence. Using our new noise model we then determine the CV-QKD key rates for the satellite-to-Earth channel, secure under general attacks in the finite-size regime of the LLO scheme. Our results are of practical importance for next-generation quantum-enabled satellites that utilize multi-photon technology as opposed to single-photon technology.

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