Realizing individual control on single qubits in a spin-based quantum register is an ever-increasing challenge due to the close proximity of the qubits resonance frequencies. Current schemes typically suffer from an inherent trade-off between fidelity and qubits selectivity. Here, we report on a new scheme which combines noise protection by dynamical decoupling and magnetic gradient based selectivity, to enhance both the fidelity and the selectivity. With a single nitrogen-vacancy center in diamond, we experimentally demonstrate quantum gates with fidelity = 0.9 ± 0.02 and a 50 kHz spectral bandwidth, which is almost an order of magnitude narrower than the unprotected bandwidth. Our scheme will enable selective control of an individual nitrogen-vacancy qubit in an interacting qubits array using relatively moderate gradients of about 1 mG/nm.
@article{arxiv.2005.04738,
title = {Selective Noise Resistant Gate},
author = {Jonatan Zimmermann and Paz London and Yaniv Yirmiyahu and Fedor Jelezko and Aharon Blank and David Gershoni},
journal= {arXiv preprint arXiv:2005.04738},
year = {2021}
}