Abstract
We propose a continuous-variable quantum key distribution (CVQKD) scheme based on the atmosphere-to-seawater channel. In particular, an untrusted entanglement source (two modes of the compressed vacuum state, TMSV) is deployed on the surface of the seawater, each mode of TMSV is sent to one of the two legitimate parts, respectively. In this way, we can establish a trans-media CVQKD link between the atmosphere and the underwater. Meanwhile, a suitable non-Gaussian operation, namely photon subtraction, is introduced to enhance the performance of the trans-media CVQKD scheme. Security analysis shows that the proposed scheme can establish a trans-media quantum communication system on the atmosphere-to-seawater channel. Moreover, the maximum transmission distance can be further extended by using proper photon subtraction operation. Our scheme provides a guidance for applying CVQKD to trans-media channels.
Highlights
Quantum key distribution (QKD) [1], [2] allows two legitimate parties, Alice, and Bob to remotely establish secure communication
We propose a continuous-variable quantum key distribution (CVQKD) scheme based on the atmosphere-to-seawater channel
We consider a situation where the quantum channel consists of multi-media and propose a trans-media CVQKD scheme based on the atmosphere-to-seawater channel to establish a trans-media quantum communication system
Summary
Quantum key distribution (QKD) [1], [2] allows two legitimate parties, Alice, and Bob to remotely establish secure communication. The transmission performance of CVQKD is weaker than the fiber Channel [12] This is mainly because the quantum signal is affected by absorption and scattering in free-space channels. Non-Gaussian modulated photon subtraction technology [13] has been proven to effectively improve the performance of CVQKD by increasing the degree of entanglement between quantum. Security analysis shows that the proposed scheme can establish a trans-media quantum communication system in the atmosphere-toseawater and generate a positive secret key rate. This paper is organized as follows: In Section 2, we introduce an untrusted entanglement source to establish a trans-media transmission model for CVQKD between atmosphere and seawater.
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