We prove the security of Gaussian continuous-variable quantum key distribution with coherent states against arbitrary attacks in the finite-size regime. In contrast to previously known proofs of principle (based on the de Finetti theorem), our result is applicable in the practically relevant finite-size regime. This is achieved using a novel proof approach, which exploits phase-space symmetries of the protocols as well as the postselection technique introduced by Christandl, Koenig, and Renner ( Phys. Rev. Lett. 102 , 020504 ( 2009 ) PRLTAO 0031-9007 ).
Physical Review Letters – American Physical Society (APS)
Published: Jan 18, 2013
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