The implementation of polarization-based quantum communication is limited by signal loss and decoherence caused by the birefringence of a single-mode fiber. We investigate the Knill dynamical decoupling scheme, implemented using half-wave plates, to minimize decoherence and show that a fidelity greater than 99% can be achieved in the absence of rotation error and a fidelity greater than 96% can be achieved in the presence of rotation error. Such a scheme can be used to preserve any quantum state with high fidelity and has potential application for constructing all optical quantum delay lines, quantum memory, and quantum repeaters.
Publication Source (Journal or Book title)
Physical Review A - Atomic, Molecular, and Optical Physics
Gupta, M., Navarro, E., Moulder, T., Mueller, J., Balouchi, A., Brown, K., Lee, H., & Dowling, J. (2015). Preserving photon qubits in an unknown quantum state with Knill dynamical decoupling: Towards an all optical quantum memory. Physical Review A - Atomic, Molecular, and Optical Physics, 91 (3) https://doi.org/10.1103/PhysRevA.91.032329