A scalable implementation of 1WQC using matter and light
Sean D. Barrett
Imperial College London, United Kingdom.
Abstract: I describe a scheme for distributed, scalable quantum computation using matter qubits, single photon interference effects, and single qubit measurements. Entanglement between spatially separated qubits is generated using a non-deterministic parity measurement via quantum interference of single photons. The scheme has the potential to overcome many of the problems inherent in scaling more conventional approaches to quantum computation, and is remarkably robust to many imperfections. As well as presenting the original scheme (Barrett and Kok, Phys. Rev. A 71, R060310 (2005) ), I will also describe more recent work extending the scheme to the situation where the emitted photons are not identical (e.g. they have different frequencies). This significantly broadens the range of systems in which this scheme can be implemented, to include solid state photon emitters (e.g. impurity centers in diamond or quantum dots) where there may be considerable variation in the frequencies of the relevant optical transitions.