We design a controlled-phase gate for linear optical quantum computing by using photodetectors that cannot resolve photon number. An intrinsic error-correction circuit corrects errors introduced by the detectors. Our controlled-phase gate has a 1/4 success probability. Recent development in cluster-state quantum computing has shown that a two-qubit gate with non-zero success probability can build an arbitrarily large cluster state only with polynomial overhead. Hence, it is possible to generate optical cluster states without number-resolving detectors and with polynomial overhead. © 2007 World Scientific Publishing Company.
Publication Source (Journal or Book title)
International Journal of Quantum Information
Wilde, M., Spedalieri, F., Dowling, J., & Lee, H. (2007). Alternate scheme for optical cluster-state generation without number-resolving photon detectors. International Journal of Quantum Information, 5 (4), 617-626. https://doi.org/10.1142/S0219749907003080