By IQT News posted 27 Jun 2019

(Physics.aps.org) Anthony Leverrier at Inria in France and colleagues have provided theoretical arguments for the security of continuous-variable (CV) QKD, a version that relies on interferometric detection schemes widely used in high-speed telecom networks. The result suggests that CVQKD holds potential for large-scale deployment in such networks.
Most protocols for quantum key distribution (QKD)—a quantum cryptography technique—encode an encryption key in discrete quantum states, such as the two orthogonal polarizations of a photon. Instead of discrete polarization states, CVQKD uses coherent quantum states that can be encoded in continuous variables like the amplitude and phase of an optical signal traveling through a fiber.
Leverrier and his team analyzed a CVQKD protocol that uses only four quantum states, which can be reliably prepared with available optical technology. Their analysis shows that this protocol could securely transmit a secret key over distances ranging from 50 to 150 km, depending on the noise in the transmission channel.

Subscribe to Our Email Newsletter

Stay up-to-date on all the latest news from the Quantum Technology industry and receive information and offers from third party vendors.

  • Forthcoming Events

    • IQT Fall | November 1-5, 2021
      Online & In-Person New York City
    • IQT, The Hague, The Netherlands | February 21-23, 2022
    • IQT Spring | May 10-12, 2022
      Online & In-Person San Diego
    • IQT Asia-Pacific Singapore 2022 | Dates Forthcoming
    • For additional information: info@3drholdings.com
0