Journal article

High-speed quantum gates with cavity quantum electrodynamics

Chun-Hsu Su, Andrew D Greentree, William J Munro, Kae Nemoto, Lloyd CL Hollenberg



Cavity quantum electrodynamic schemes for quantum gates are amongst the earliest quantum computing proposals. Despite continued progress and the recent demonstration of photon blockade, there are still issues with optimal coupling and gate operation involving high-quality cavities. Here we show that dynamic cavity control allows for scalable cavity-QED based quantum gates using the full cavity bandwidth. This technique allows an order of magnitude increase in operating speed, and two orders reduction in cavity Q, over passive systems. Our method exploits Stark shift-based Q switching, and is ideally suited to solid-state integrated optical approaches to quantum computing. © 2008 The American..

View full abstract


Awarded by ARC

Funding Acknowledgements

We thank A. M. Stephens, Z. W. E. Evans, C. D. Hill, and S. J. Devitt for valuable discussions. W. J. M. and K. N. acknowledge the support of QAP, MEXT, NICT, and HP. C. H. S., A. D. G., and L. C. L. H. acknowledge the support of Quantum Communications Victoria, funded by the Victorian Science, Technology and Innovation (STI) initiative, the Australian Research Council (ARC), and the International Science Linkages program. ADG and LCLH acknowledge the ARC for financial support (Projects No. DP0880466 and No. DP0770715, respectively).