"Quantum computing with hypercubes of light"Pei Wang , University of Virginia [Host: Olivier Pfister]
ABSTRACT:
Quantum computing promises exponential speedup for particular computational tasks, such as factoring integers[1] and quantum simulation[2]. There are two main flavors of quantum computing: the circuit model and the measurementbased modelin particular, oneway quantum computing [3], which is implemented by applying measurements on an entangled resource known as a cluster state. Complicated computation tasks require the scalable generation of cluster states, which remains a formidable challenge. Pfisterlabs at UVa has been working on generating scalable cluster states and has successfully built some interesting cluster states [4,5].
In this colloquium, I will first explain continuous variable oneway quantum computing, cluster states, and then present our new proposal of a simple, "topdown" setup to generate largesize, Dhypercubiclattice CV cluster states of more than 6000 entangled modes using D identical optical parametric oscillators (OPOs), each with a twofrequency pump [6]. These cluster states are sufficient for universal oneway quantum computation [3], and the high dimensional lattices are useful in quantum error correction based on Kitaev's surface code [7]. Our optical construction methods eschews the limitations of a threedimensional world, enabling simulation of measurements on these highvalence cluster graphs and also inviting theoretical and experimental investigations of their topological properties [8].
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Colloquium Friday, February 21, 2014 3:30 PM Physics Building, Room 204 Note special room. 
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