Journal
NEW JOURNAL OF PHYSICS
Volume 11, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/11/9/095001
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Funding
- General Dynamics Canada
- Alberta's Informatics Circle of Research Excellence (iCORE)
- National Science and Engineering Research Council of Canada (NSERC)
- QuantumWorks
- Canada Foundation for Innovation (CFI)
- Alberta Advanced Education and Technology (AET)
- CMC Microsystems
- Mexican Consejo Nacional de Ciencia y Tecnologia (CONACYT)
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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.
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