20 May 2009 Inhibition of decoherence in flying qubits
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Abstract
In recent years the interest in the manipulation of quantum systems has furthered new strategies for maintaining their coherence, continuously threatened by unwanted and uncontrollable interactions with the environment. Photons interact weakly with the surroundings. Even so decoherence may significantly affect their polarization state during the propagation within dispersive media because of the unavoidable presence of more than a single frequency in the envelope of the photon pulse. Here we report on a suppression of the polarization decoherence in a ring cavity obtained by properly retooling for the photon qubit the "bang-bang" protection technique already employed for nuclear spins and nuclear-quadrupole qubits. Our results show that bang-bang control can be profitably extended to all quantum information processes involving flying polarization qubits.
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S. Damodarakurup, S. Damodarakurup, M. Lucamarini, M. Lucamarini, G. Di Giuseppe, G. Di Giuseppe, D. Vitali, D. Vitali, P. Tombesi, P. Tombesi, "Inhibition of decoherence in flying qubits", Proc. SPIE 7366, Photonic Materials, Devices, and Applications III, 73660V (20 May 2009); doi: 10.1117/12.823303; https://doi.org/10.1117/12.823303
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