Dynamically Error-Corrected Gates for Universal Quantum Computation

Kaveh Khodjasteh, Lorenza Viola

Published 2008-10-03, updated 2009-01-20Version 2

Scalable quantum computation in realistic devices requires that precise control can be implemented efficiently in the presence of decoherence and operational errors. We propose a general constructive procedure for designing robust unitary gates on an open quantum system without encoding or measurement overhead. Our results allow for a low-level error correction strategy solely based on Hamiltonian engineering using realistic bounded-strength controls and may substantially reduce implementation requirements for fault-tolerant quantum computing architectures.