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Publication - Professor John Rarity

    Space QUEST mission proposal: experimentally testing decoherence due to gravity


    Joshi, SK, Pienaar, J, Ralph, TC, Cacciapuoti, L, Mccutcheon, W, Rarity, JG, Giggenbach, D, Lim, JG, Makarov, V, Fuentes, I, Scheidl, T, Beckert, E, Bourennane, M, Bruschi, DEE, Cabello, A, Capmany, J, Carrasco-casado, A, Diamanti, E, Dusek, M, Elser, D, Gulinatti, A, Hadfield, RH, Jennewein, T, Kaltenbaek, R, Krainak, MA, Lo, Marquardt, C, Milburn, GJ, Peev, M, Poppe, A, Pruneri, V, Renner, R, Salomon, C, Skaar, J, Solomos, N, Stipčević, M, Torres, JP, Toyoshima, M, Villoresi, P, Walmsley, I & others 2018, ‘Space QUEST mission proposal: experimentally testing decoherence due to gravity’. New Journal of Physics, vol 20.


    Models of quantum systems on curved space-times lack sufficient
    experimental verification. Some speculative theories suggest that
    quantum correlations, such as entanglement, may exhibit different
    behavior to purely classical correlations in curved space. By measuring
    this effect or lack thereof, we can test the hypotheses behind several
    such models. For instance, as predicted by Ralph et al [5] and
    Ralph and Pienaar [1], a bipartite entangled system could decohere if
    each particle traversed through a different gravitational field
    gradient. We propose to study this effect in a ground to space uplink
    scenario. We extend the above theoretical predictions of Ralph and
    coworkers and discuss the scientific consequences of detecting/failing
    to detect the predicted gravitational decoherence. We present a detailed
    mission design of the European Space Agency's Space QUEST
    (Space—Quantum Entanglement Space Test) mission, and study the
    feasibility of the mission scheme.

    Full details in the University publications repository