We report a simple quantum key distribution experiment in which a shared reference frame is not necessary. Logical qubits are encoded into non-separable states of polarization and first-order transverse spatial modes of the same photon.
© 2008 Optical Society of America
C. E. Souza, C. V. Borges, A. Z. Khoury, J. A. Huguenin, L. Aolita, and S. P. Walborn, "BB84 Quantun Key Distribution without a Shared Reference Frame," in International Conference on Quantum Information, (Optical Society of America, 2008), paper JMB56.