I Lucio-Martinez et al 2009 New J. Phys. 11 095001 doi:10.1088/1367-2630/11/9/095001
Proof-of-concept of real-world quantum key distribution with quantum frames
Focus on Quantum Cryptography: Theory and PracticeI Lucio-Martinez1, P Chan2, X Mo1,4, S Hosier3 and W Tittel1
Show affiliationsPart of Focus on Quantum Cryptography: Theory and Practice
We propose a fibre-based quantum key distribution system, which employs polarization qubits encoded into faint laser pulses. As a novel feature, it allows sending of classical framing information via sequences of strong laser pulses that precede the quantum data. This allows synchronization, sender and receiver identification and compensation of time-varying birefringence in the communication channel. In addition, this method also provides a platform to communicate implementation specific information such as encoding and protocol in view of future optical quantum networks. We demonstrate in a long-term (37 h) proof-of-principle study that polarization information encoded in the classical control frames can indeed be used to stabilize unwanted qubit transformation in the quantum channel. All optical elements in our setup can be operated at Gbps rates, which is a first requirement for a future system delivering secret keys at Mbps. In order to remove another bottleneck towards a high rate system, we investigate forward error correction based on low-density parity-check codes.
- PACS
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03.67.Dd Quantum cryptography and communication security
03.67.Lx Quantum computation architectures and implementations
84.40.Ua Telecommunications: signal transmission and processing; communication satellites
- Subjects
- Dates
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Issue 9 (September 2009)
Received 6 January 2009
Published 2 September 2009
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Proof-of-concept of real-world quantum key distribution with quantum frames
I Lucio-Martinez et al 2009 New J. Phys. 11 095001
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