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. © 2005 Springer Science+Business Media, Inc.
Publication Source (Journal or Book title)
Experimental Aspects of Quantum Computing
Dowling, J., Franson, J., Lee, H., & Milburn, G. (2005). Towards scalable linear-optical quantum computers. Experimental Aspects of Quantum Computing, 205-213. https://doi.org/10.1007/0-387-27732-3_13