Single-photon sources for linear optics quantum computation

Kiraz, Mete Atatüre, Imamoglu

Michael Varnava, Dan E. Browne, Terry Rudolph

We present a scheme for linear optical quantum computation that is highly robust to imperfect single photon sources and inefficient detectors. In particular we show that if the product of the detector efficiency with the source efficiency is greater than 2/3, then efficient linear optical quantum computation is possible. This high threshold is achieved within the cluster state paradigm for quantum computation.

Gerard J Milburn, Emanuel H. Knill, Raymond Laflamme

Emanuel H. Knill, Raymond Laflamme, Gerard J Milburn

We investigate the computational power of passive and active linear optical elements and photo-detectors. We show that single photon sources, passive linear optics and photo-detectors are sufficient for implementing reliable quantum algorithms. Feedback from the detectors to the optical elements is required for this implementation. Without feedback, non-deterministic quantum computation is possible. A single photon source sufficient for quantum computation can be built with an active linear optical element (squeezer) and a photo-detector. The overheads associated with using only linear optics appear to be sufficiently low to make quantum computation based on our proposal a viable alternative.

Christoph Adami, Nicolas J. Cerf

Alper Kıraz, Mete Atatüre, Ataç İmamoğlu

We show that, in contrast to single photon sources based on incoherently pumped anharmonic emitters, a coherently pumped single photon source can simultaneously achieve high collection efficiency and indistinguishability of the generated photons.