Scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite the ease of implementation of one-qubit gates. Two-qubit gates necessarily need a non-linear interaction between the two photons, and the efficiency of this non-linear interaction is typically very small in bulk materials. However, it has recently been shown that this barrier can be circumvented with effective non-linearities produced by projective measurements, and with this work linear-optical quantum computing becomes a new avenue towards scalable quantum computation. We review several issues concerning the principles and requirements of this scheme. © 2004 Springer Science+Business Media, Inc.
Publication Source (Journal or Book title)
Quantum Information Processing
Dowling, J., Franson, J., Lee, H., & Milburn, G. (2004). Towards scalable linear-optical quantum computers. Quantum Information Processing, 3 (1-5), 205-213. https://doi.org/10.1007/s11128-004-9419-1