Efficient high-fidelity quantum computation using matter qubits and linear optics
Physical Review A 71, 060310, Rapid Communication (2005)
We propose a practical method to generate cluster states for quantum computers. The qubit systems can be NV-centers in diamond, Pauli-blockade quantum dots with an excess electron or trapped ions with optical transitions, which are each placed in a cavity and subsequently entangled using a double-heralded single-photon detection scheme. The fidelity of the resulting entanglement is extremely robust against the most important errors such as detector loss, spontaneous emission, and mismatch of cavity parameters. The cluster states are generated scalably using a probabilistic entanglement swapping protocol. Existing experimental parameters indicate that high fidelity clusters can be generated with a moderate constant overhead.