Solid State Photonic Quantum Information Science

The transfer of information between solid state "static" spin qubits and photonic "flying" qubits is a rich area for quantum information devices. The transfer of quantum information involves generating entanglement, this entanglement can be exploited to perform a multitude of tasks, from on chip quantum gates in a quantum computer, all the way to long range quantum communication via satellite. The key step is to make the transfer of information between photon and spin deterministic, to this end the group in Bristol focus on solid state spins embedded in photonic architectures, such as cavities and waveguides. Here the light field is strongly modified by the photonic structures in such a way that it deterministically interacts with a spin embedded in the device. This determinism leads to scalable devices that can easily be concatenated to build a large scale quantum computer or quantum communication network.

Figure showing deterministic entanglement swapping using solid state quantum dot spins in pillar microcavities. This protocol would allow entanglement to be distributed over large distances and form the building block of a quantum Internet.
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