Experimental demonstration of counterfactual quantum communication

Based on principle of quantum mechanics, quantum cryptography provides an intriguing way to establish secret keys between remote parties, generally relying on actual transmission of signal particles. Surprisingly, an even more striking method is recently proposed by Noh named as `counterfactual quan...

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Bibliographic Details
Published in:arXiv.org 2011-07
Main Authors: Liu, Yang, Ju, Lei, Xiao-Lei, Liang, Shi-Biao Tang, Guo-Liang, Shen Tu, Zhou, Lei, Cheng-Zhi, Peng, Chen, Kai, Teng-Yun, Chen, Zeng-Bing, Chen, Jian-Wei, Pan
Format: Article
Language:English
Subjects:
Bit error rate
Interferometers
Quantum cryptography
Quantum mechanics
Quantum theory
Qubits (quantum computing)
Online Access:Get full text
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Summary:Based on principle of quantum mechanics, quantum cryptography provides an intriguing way to establish secret keys between remote parties, generally relying on actual transmission of signal particles. Surprisingly, an even more striking method is recently proposed by Noh named as `counterfactual quantum cryptography' enabling key distribution, in which particles carrying secret information are seemly not being transmitted through quantum channel. We experimentally give here a faithful implementation by following the scheme with an on-table realization. Furthermore, we report an illustration on a 1 km fiber operating at telecom wavelength to verify its feasibility for extending to long distance. For both cases, high visibilities of better than 98% are maintained with active stabilization of interferometers, while a quantum bit error rate around 5.5% is attained after 1 km channel.
ISSN:2331-8422
DOI:10.48550/arxiv.1107.5754