Dynamical Decoupling of a single electron spin at room temperature

Abstract

Here we report the increase of the coherence time T${}_2$ of a single electron spin at room temperature by using dynamical decoupling. We show that the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence can prolong the T${}_2$ of a single Nitrogen-Vacancy center in diamond up to 2.44 ms compared to the Hahn echo measurement where T${}_2=390\mu$s. Moreover, by performing spin locking experiments we demonstrate that with CPMG the maximum possible $T_2$ is reached. On the other hand, we do not observe strong increase of the coherence time in nanodiamonds, possibly due to the short spin lattice relaxation time $T_1=100\mu$s (compared to T${}_1$ = 5.93 ms in bulk). An application for detecting low magnetic field is demonstrated, where we show that the sensitivity using the CPMG method is improved by about a factor of two compared to the Hahn echo method.

4 pages, 4 figures, Two reference were added reporting results related to our work

References in corpus (9)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• How to Enhance Dephasing Time in Superconducting Qubits
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• Extending Quantum Coherence in Diamond
• Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond
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Cited by in corpus (3)

• Single Ion Quantum Lock-In Amplifier
• Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
• Dynamical Decoupling in the Presence of Realistic Pulse Errors