Quantum computing without qubit-qubit interactions

Details Quantum computing without qubit-qubit interactions Quantum computing without qubit-qubit interactions

2005-12-06

arxiv.org/abs/cond-mat/0512121v1

in: Quantum Theory and Symmetries IV, edited by V. K. Dobrev, Heron Press, Sofia (2006), p. 22.

Physics

Condensed Matter

Other Condensed Matter

11 pages, 6 figures, proceedings for the conference Quantum Theory and Symmetries 4 in Varna, August 2005

Scientific paper

Quantum computing tries to exploit entanglement and interference to process information more efficiently than the best known classical solutions. Experiments demonstrating the feasibility of this approach have already been performed. However, finding a really scalable and robust quantum computing architecture remains a challenge for both, experimentalists and theoreticians. In most setups decoherence becomes non-negligible when one tries to perform entangling gate operations using the coherent control of qubit-qubit interactions. However, in this proceedings we show that two-qubit gate operations can be implemented even without qubit-qubit interactions and review a recent quantum computing scheme by Lim et al. [Phys. Rev. Lett. 95, 030505 (2005)] using only single photon sources (e.g. atom-cavity systems, NV colour centres or quantum dots) and photon pair measurements.

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