Fully robust qubit in atomic and molecular three-level systems

N. Aharon*, I. Cohen, F. Jelezko, A. Retzker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We present a new method of constructing a fully robust qubit in a three-level system. By the application of continuous driving fields, robustness to both external and controller noise is achieved. Specifically, magnetic noise and power fluctuations do not operate within the robust qubit subspace. Whereas all the continuous driving based constructions of such a fully robust qubit considered so far have required at least four levels, we show that in fact only three levels are necessary. This paves the way for simple constructions of a fully robust qubit in many atomic and solid state systems that are controlled by either microwave or optical fields. We focus on the NV-center in diamond and analyze the implementation of the scheme, by utilizing the electronic spin sub-levels of its ground state. In current state-of-the-art experimental setups the scheme leads to improvement of more than two orders of magnitude in coherence time, pushing it towards the lifetime limit. We show how the fully robust qubit can be used to implement quantum sensing, and in particular, the sensing of high frequency signals.

Original languageAmerican English
Article number123012
JournalNew Journal of Physics
Issue number12
StatePublished - Dec 2016

Bibliographical note

Publisher Copyright:
© 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.


  • dynamical decoupling
  • quantum sensing
  • quantum technologies


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