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Title: Efficient quantum key distribution with trines of reference-frame-free qubits
Authors: Tabia, G.
Englert, B.-G. 
Keywords: Quantum key distribution
Reference-frame-free qubits
Trine states
Issue Date: 24-Jan-2011
Citation: Tabia, G., Englert, B.-G. (2011-01-24). Efficient quantum key distribution with trines of reference-frame-free qubits. Physics Letters, Section A: General, Atomic and Solid State Physics 375 (4) : 817-822. ScholarBank@NUS Repository.
Abstract: We propose a rotationally-invariant quantum key distribution scheme that uses a pair of orthogonal qubit trines, realized as mixed states of three physical qubits. The measurement outcomes do not depend on how Alice and Bob choose their individual reference frames. The efficient key generation by two-way communication produces two independent raw keys, a bit key and a trit key. For a noiseless channel, Alice and Bob get a total of 0.573 key bits per trine state sent (98% of the Shannon limit). This exceeds by a considerable amount the yield of standard trine schemes, which ideally attain half a key bit per trine state. Eavesdropping introduces an ε-fraction of unbiased noise, ensured by twirling if necessary. The security analysis reveals an asymmetry in Eve's conditioned ancillas for Alice and Bob resulting from their inequivalent roles in the key generation. Upon simplifying the analysis by a plausible symmetry assumption, we find that a secret key can be generated if the noise is below the threshold set by ε=0.197. © 2010 Elsevier B.V. All rights reserved.
Source Title: Physics Letters, Section A: General, Atomic and Solid State Physics
ISSN: 03759601
DOI: 10.1016/j.physleta.2010.12.052
Appears in Collections:Staff Publications

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