Advantages of the coherent state compared with squeeze state in unidimensional continuous variable quantum key distribution
arXiv:1809.09775 · doi:10.1007/s11128-018-2118-0
Abstract
In this work, a comparison study between unidimensional (UD) coherent-state and UD squeeze-state protocols is performed in the continuous variable quantum key distribution domain. First, the UD squeeze-state protocol is proposed and the equivalence between the prepare-and-measure and entanglement-based schemes of UD squeeze-state protocol is proved. Then, the security of the UD squeeze-state protocol under collective attack in realistic conditions is analyzed. Lastly, the performances of the two UD protocols are analyzed. Based on the uniform expressions established in our study, the squeeze-state and coherent-state protocols can be analyzed simultaneously. Our results show that the UD squeeze-state protocols are quite different from the two-dimensional protocols in that the UD squeeze-state protocols have a poorer performance compared with UD coherent-state protocols, which is opposite in the case of two-dimensional protocols.
12 pages, 8 figures,
References in corpus (9)
- Unconditional optimality of Gaussian attacks against continuous-variable QKD
- Quantum key distribution over 25 km with an all-fiber continuous-variable system
- Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
- Composable security proof for continuous-variable quantum key distribution with coherent states
- Experimental study on Gaussian-modulated coherent states quantum key distribution over standard telecom fiber
- Continuous-variable quantum key distribution protocols over noisy channels
- Security of Binary Modulated Continuous Variable Quantum Key Distribution under Collective Attacks
- A security proof of continuous-variable QKD using three coherent states
- Passive state preparation in the Gaussian-modulated coherent states quantum key distribution