Research output: Contribution to journal › Article

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

Research output: Contribution to journal › Article

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

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

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

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title = "Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels",

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.",

keywords = "quant-ph, physics.optics",

author = "Panagiotis Papanastasiou and Cosmo Lupo and Christian Weedbrook and Stefano Pirandola",

note = "{\circledC}2018 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details. REVTeX. 8 pages. 7 figures",

year = "2018",

month = "7",

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doi = "10.1103/PhysRevA.98.012340",

language = "English",

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publisher = "American Physical Society",

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T2 - Asymptotic security analysis in thermal-loss channels

AU - Papanastasiou, Panagiotis

AU - Lupo, Cosmo

AU - Weedbrook, Christian

AU - Pirandola, Stefano

N1 - ©2018 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details. REVTeX. 8 pages. 7 figures

PY - 2018/7/31

Y1 - 2018/7/31

N2 - 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.

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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KW - physics.optics

U2 - 10.1103/PhysRevA.98.012340

DO - 10.1103/PhysRevA.98.012340

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JO - Phys. Rev. A

JF - Phys. Rev. A

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