Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/19238
Title: Security analysis of a basis-independent scheme for quantum cryptography
Authors: TABIA GELO NOEL MACUJA
Keywords: trine protocol, quantum cryptography, reference-frame-free
Issue Date: 19-May-2009
Source: TABIA GELO NOEL MACUJA (2009-05-19). Security analysis of a basis-independent scheme for quantum cryptography. ScholarBank@NUS Repository.
Abstract: We propose a rotationally-invariant quantum key distribution (QKD) scheme with a pair of orthogonal qubit trines. This double trine scheme uses mixed product states of a singlet and a random qubit. The measurement outcomes of the scheme are independent of the reference frames chosen by Alice or Bob. This scheme produces two sets of keys, a bit key and a trit key. The noiseless mutual information between Alice and Bob is approximately 0.573 (98% of the Shannon limit), exceeding by a considerable amount that of other trine-based schemes such as PBC00, which attains 85.5% of the Shannon limit. The security analysis reveals an asymmetry in Eve's conditioned ancillas for Alice and Bob resulting from the asymmetry in key generation. We find the absolute noise thresholds are e=0.17 for the bit case and e=0.15 for the trit case, which Eve attains by optimizing a single free parameter.
URI: http://scholarbank.nus.edu.sg/handle/10635/19238
Appears in Collections:Master's Theses (Open)

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