Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 51: Quantencomputer
Q 51.2: Vortrag
Mittwoch, 15. März 2006, 15:15–15:30, HI
Optimal strategies for fusing optical cluster states — •Konrad Kieling1,2 and Jens Eisert1,2 — 1QOLS, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, UK — 2Institute for Mathematical Sciences, Imperial College London, 48 Prince’s Gardens, London SW7 2PE, UK
We investigate and solve the problem of how to optimally build up cluster states for quantum computing with linear optical means using fusion gates, entirely from the perspective of classical control. We develop a notion of classical strategies and identify the optimal one to prepare linear cluster states with probabilisitic gates. We find that this globally optimal strategy gives rise to an advantage of more than an order of magnitude in the number of maximally entangled pairs already when building chains with an expected length of L=100, compared to another strategy that could equally well be thought as being optimal. For two-dimensional cluster states, we present a proof of global optimality of the asymptotic behavior in the resources. This analysis shows that the choice of appropriate classical control may lead to a very significant reduction in resource consumption.