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Continuous-variable QKD over long distances

Outline of the talk. Continuous-variable QKD- quick overview

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Continuous-variable QKD over long distances

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    1. Continuous-variable QKD over long distances Anthony Leverrier, Télécom ParisTech

    2. Outline of the talk Continuous-variable QKD - quick overview – Towards long distance CV QKD - with a discrete modulation –

    3. Continuous-variable QKD - Quick overview -

    4. Quantum Key Distribution QKD ? Alice & Bob can share a secret key. This key can be used for classical cryptography: one-time pad, AES …

    5. QKD with coherent states Alice encodes information into the quadratures of the EM field Coherent states with a Gaussian modulation Bob detects this state with an homodyne (interferometric) detection ? Continuous-Variable QKD.

    6. Gaussian channel model The coherent states sent in the quantum channel can be altered by:

    7. Security proofs (1/2)

    8. Security proofs (2/2)

    9. Pros & Cons

    11. Towards long distance CVQKD - With a discrete modulation -

    12. Impact of reconciliation efficiency

    13. Gaussian or discrete modulation ? K = ß IAB - IBE One wants to maximize ß IAB A Gaussian modulation maximizes IAB … but not ß IAB

    14. Binary variables are easy to reconcile

    17. Performances

    18. CV QKD with Gaussian modulation optimal in theory limited range (30-50 km) because of error correction Discrete modulation reconciliation problem solved by design potential long distances (> 100 km) close to optimal in practice

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