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How do you make a topologically interesting system with light?

Quantum superposition states are immensely delicate things - any interaction with the environment can cause them to decohere. This poses a significant problem for quantum computing, where information would need to be stored within quantum states for relatively long periods of time. A promising way to isolate a system exploits the topology of the system, known as 'topological protection'...

Added:04 Apr 2014