Two-way quantum cryptography at different wavelengths

TY - JOUR

T1 - Two-way quantum cryptography at different wavelengths

AU - Weedbrook, Christian

AU - Ottaviani, Carlo

AU - Pirandola, Stefano

N1 - 8 pages, 6 figures

PY - 2014/1/10

Y1 - 2014/1/10

N2 - We study the security of two-way quantum cryptography at different wavelengths of the electromagnetic spectrum, from the optical range down to the microwave range. In particular, we consider a two-way quantum communication protocol where Gaussian-modulated thermal states are subject to random Gaussian displacements and finally homodyned. We show how its security threshold (in reverse reconciliation) is extremely robust with respect to the preparation noise and able to outperform the security thresholds of one-way protocols at any wavelength. As a result, improved security distances are now accessible for implementing quantum key distribution at the very challenging regime of infrared frequencies.

AB - We study the security of two-way quantum cryptography at different wavelengths of the electromagnetic spectrum, from the optical range down to the microwave range. In particular, we consider a two-way quantum communication protocol where Gaussian-modulated thermal states are subject to random Gaussian displacements and finally homodyned. We show how its security threshold (in reverse reconciliation) is extremely robust with respect to the preparation noise and able to outperform the security thresholds of one-way protocols at any wavelength. As a result, improved security distances are now accessible for implementing quantum key distribution at the very challenging regime of infrared frequencies.

KW - quant-ph

U2 - 10.1103/PhysRevA.89.012309

DO - 10.1103/PhysRevA.89.012309

M3 - Article

SN - 1050-2947

VL - 89

JO - Physical Review A

JF - Physical Review A

IS - 1

M1 - 012309

ER -