Extending Quantum Coherence in Diamond

Abstract

We experimentally demonstrate over two orders of magnitude increase in the coherence time of nitrogen vacancy centres in diamond by implementing decoupling techniques. We show that equal pulse spacing decoupling performs just as well as non-periodic Uhrig decoupling and has the additional benefit that it allows us to take advantage of "revivals" in the echo (due to the coherent nature of the bath) to explore the longest coherence times. At short times, we can extend the coherence of particular quantum states out from T_2*=2.7 us out to an effective T_2 > 340 us. For preserving arbitrary states we show the experimental importance of using pulse sequences, that through judicious choice of the phase of the pulses, compensate the imperfections of individual pulses for all input states. At longer times we use these compensated sequences to enhance the echo revivals and show a coherence time of over 1.6 ms in ultra-pure natural abundance 13C diamond.

7 pages, 7 figures; minor syntax/typo. changes and updated references

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Cited by in corpus (10)

• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Robust dynamical decoupling for quantum computing and quantum memory
• Dynamical Decoupling of a single electron spin at room temperature
• Single-spin magnetometry with multi-pulse sensing sequences
• Nuclear spin pair coherence in diamond for atomic scale magnetometry
• Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
• Anomalous decoherence effect in a quantum bath
• Keeping a Single Qubit Alive by Experimental Dynamic Decoupling
• Dynamical Decoupling in the Presence of Realistic Pulse Errors
• Extending quantum control of time-independent systems to time-dependent systems