Experimental creation of quantum Zeno subspaces by repeated multi-spin projections in diamond

N. Kalb, J. Cramer, D. J. Twitchen, M. Markham, R. Hanson, T. H. Taminiau*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)
57 Downloads (Pure)


Repeated observations inhibit the coherent evolution of quantum states through the quantum Zeno effect. In multi-qubit systems this effect provides opportunities to control complex quantum states. Here, we experimentally demonstrate that repeatedly projecting joint observables of multiple spins creates quantum Zeno subspaces and simultaneously suppresses the dephasing caused by a quasi-static environment. We encode up to two logical qubits in these subspaces and show that the enhancement of the dephasing time with increasing number of projections follows a scaling law that is independent of the number of spins involved. These results provide experimental insight into the interplay between frequent multi-spin measurements and slowly varying noise and pave the way for tailoring the dynamics of multi-qubit systems through repeated projections.

Original languageEnglish
Article number13111
JournalNature Communications
Publication statusPublished - 7 Oct 2016


  • quantum information
  • qubits


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