Encoding many qubits in different degrees of freedom (DOFs) of single photons is one of the routes toward enlarging the Hilbert space spanned by a photonic quantum state. Hyperentangled photon states ...
Experimental set-up showing the chip with optical fibre input and output coupling. The chip is around 2 mm long. (Courtesy: M Thompson) Researchers in the UK, Japan and the Netherlands have fabricated ...
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