Quantum dense coding without entanglement

Details Quantum dense coding without entanglement Quantum dense coding without entanglement

2010-03-02

arxiv.org/abs/1003.0484v2

Physics

Quantum Physics

New title, 6 pages, 3 figures. Submitted to PRL: 12/23/09. Includes PRL response. Possible it will not be published in PRL; PR

Scientific paper

We describe a quantum cryptography protocol with up to twenty four-dimensional ($\mathcal{D} =4$) states generated by a polarization-, phase- and time-encoding transmitter. This protocol can be experimentally realized with existing technology, drawing from time-encoded and polarization-encoded systems. The protocol is error tolerant and has a quantum bit-rate of 2 per transmission/detection, which when combined with state detection efficiency yields a qubit efficiency of up to 1 or double that of BB84-{\it like} protocols.

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