Coherent Error Suppression in Multiqubit Entangling Gates
David Hayes, Susan Clark, Shantanu Debnath, David Hucul, I. V. Inlek, K. W. Lee, Qudsia Sara Quraishi, Christopher R. Monroe · Physical Review Letters · 2012
We demonstrate a simple pulse shaping technique designed to improve the fidelity of spin-dependent force operations commonly used to implement entangling gates in trapped ion systems. This extension of the Mølmer-Sørensen gate can theoretically suppress the effects of certain frequency and timing errors to any desired order and is demonstrated through Walsh modulation of a two qubit entangling gate on trapped atomic ions. The technique is applicable to any system of qubits coupled through collective harmonic oscillator modes.