Efficient and Robust Quantum Key Distribution With Minimal State Tomography

We introduce the Singapore protocol, a qubit protocol for quantum key distribution that is fully tomographic, more efficient than other tomographic protocols, and very robust. Under ideal circumstances the efficiency is log_2(4/3)=0.415 key bits per qubit sent. This is 25% more than the efficiency o...

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Bibliographic Details
Published in:arXiv.org 2008-05
Main Authors: Berthold-Georg Englert, Kaszlikowski, Dagomir, Ng, Hui Khoon, Wee Kang Chua, Řeháček, Jaroslav, Anders, Janet
Format: Article
Language:English
Subjects:
Eavesdropping
Protocol
Quantum cryptography
Qubits (quantum computing)
Online Access:Get full text
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Summary:We introduce the Singapore protocol, a qubit protocol for quantum key distribution that is fully tomographic, more efficient than other tomographic protocols, and very robust. Under ideal circumstances the efficiency is log_2(4/3)=0.415 key bits per qubit sent. This is 25% more than the efficiency of 1/3=0.333 for the standard six-state protocol, which sets the benchmark. We describe a simple two-way communication scheme that extracts 0.4 key bits per qubit and thus gets close to the information-theoretical limit. The noise thresholds that we report for a hierarchy of eavesdropping attacks demonstrate the robustness of the protocol: A secure key can be extracted if there is less than 38.9% noise.
ISSN:2331-8422