## Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels

Research output: Contribution to journalArticle

### Standard

Quantum key distribution with phase-encoded coherent states : Asymptotic security analysis in thermal-loss channels. / Papanastasiou, Panagiotis; Lupo, Cosmo; Weedbrook, Christian; Pirandola, Stefano.

In: Phys. Rev. A, Vol. 98, 012340, 31.07.2018, p. 1-8.

Research output: Contribution to journalArticle

### Harvard

Papanastasiou, P, Lupo, C, Weedbrook, C & Pirandola, S 2018, 'Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels', Phys. Rev. A, vol. 98, 012340, pp. 1-8. https://doi.org/10.1103/PhysRevA.98.012340

### APA

Papanastasiou, P., Lupo, C., Weedbrook, C., & Pirandola, S. (2018). Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels. Phys. Rev. A, 98, 1-8. [012340]. https://doi.org/10.1103/PhysRevA.98.012340

### Vancouver

Papanastasiou P, Lupo C, Weedbrook C, Pirandola S. Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels. Phys. Rev. A. 2018 Jul 31;98:1-8. 012340. https://doi.org/10.1103/PhysRevA.98.012340

### Author

Papanastasiou, Panagiotis ; Lupo, Cosmo ; Weedbrook, Christian ; Pirandola, Stefano. / Quantum key distribution with phase-encoded coherent states : Asymptotic security analysis in thermal-loss channels. In: Phys. Rev. A. 2018 ; Vol. 98. pp. 1-8.

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abstract = "We consider discrete-alphabet encoding schemes for coherent-state quantum key distribution. The sender encodes the letters of a finite-size alphabet into coherent states whose amplitudes are symmetrically distributed on a circle centered in the origin of the phase space. We study the asymptotic performance of this phase-encoded coherent-state protocol in direct and reverse reconciliation assuming both loss and thermal noise in the communication channel. In particular, we show that using just four phase-shifted coherent states is sufficient for generating secret key rates of the order of $4 \times 10^{-3}$ bits per channel use at about 15 dB loss in the presence of realistic excess noise.",
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author = "Panagiotis Papanastasiou and Cosmo Lupo and Christian Weedbrook and Stefano Pirandola",
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AU - Pirandola, Stefano

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AB - We consider discrete-alphabet encoding schemes for coherent-state quantum key distribution. The sender encodes the letters of a finite-size alphabet into coherent states whose amplitudes are symmetrically distributed on a circle centered in the origin of the phase space. We study the asymptotic performance of this phase-encoded coherent-state protocol in direct and reverse reconciliation assuming both loss and thermal noise in the communication channel. In particular, we show that using just four phase-shifted coherent states is sufficient for generating secret key rates of the order of $4 \times 10^{-3}$ bits per channel use at about 15 dB loss in the presence of realistic excess noise.

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