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 absence of rotation error and fidelity greater than 96% can be achieved in 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 line, quantum memory, and quantum repeater.
Publication Source (Journal or Book title)
Proceedings of SPIE - The International Society for Optical Engineering
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. Proceedings of SPIE - The International Society for Optical Engineering, 9377 https://doi.org/10.1117/12.2084318