Optical continuous-variable cluster states as a collection of entangled spins

Speaker: 
Nicholas Menicucci, U Sydney, Australia
Event Date and Time: 
Wed, 2013-01-09 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Robert Raussendorf
Intended Audience: 
Graduate
Measurement-based quantum computation uses local measurements on a highly entangled resource state, called a cluster state, to perform computation. Optical continuous-variable cluster states store quantum information in continuous degrees of freedom in modes of light. Using the Schwinger Representation of SU(2), which maps a pair of harmonic oscillators to a single quantum mechanical spin, we reinterpret a class of continuous-variable cluster states as a system of entangled spins. This identification allows us to apply known results for angular momentum to this seemingly unrelated system. By mapping from continuous-variable entanglement to entanglement between (potentially finite-dimensional) spin systems, we hope to provide a new avenue for using these states for quantum computation and quantum emulation. This is work done primarily by my Honours student, Natasha Gabay, at The University of Sydney.
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