Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 70: Quanteninformation: Konzepte und Methoden 6

Q 70.5: Vortrag

Freitag, 16. März 2012, 15:00–15:15, V7.03

Towards quantum computation with multi-particle interference — •Vincenzo Tamma1, Yanhua Shih2, and Wolfgang P. Schleich11Institut für Quantenphysik, Universität Ulm — 2Physics Department, Univ. of Maryland, Baltimore County

One of the main challenges in quantum computation is the realization of entangled states with a large number of particles.

We have experimentally demonstrated a novel factoring algorithm which relies only on optical multi-path interference and on the periodicity properties of Gauss sums with continuous arguments [1,2,3]. An interesting implementation of such a method can, in principle, take advantage of matter-wave interferometers characterized by long-time evolution of a BEC in microgravity [4].

A more recent approach to factorization aims to achieve an exponential speed-up without entanglement by exploiting multi-particle m-order interference. In this case, the basic requirement for quantum computation is interference of an exponentially large number of multi-particle amplitudes.

[1] V. Tamma, H. Zhang, X. He, A. Garuccio, W.P. Schleich, and Y. Shih, Phys. Rev. A Rap. Com. 83, 020304 (2011). [2] V. Tamma, H. Zhang, X. He, A. Garuccio, W.P. Schleich, and Y. Shih, Found. of Phys., 1-11 (2010). [3] V. Tamma, H. Zhang, X. He, A. Garuccio and Y. Shih, J. Mod. Opt. 56, 2125-2132 (2009). [4] T. van Zoest et al., Science 328, 1540 (2010).

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