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Researchers identified a new noise spectrum limiting quantum coherence in diamond nitrogen-vacancy centers. A novel dynamical decoupling strategy overcomes this empirical limit, approaching the physical coherence time limit.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Materials Science

Background:

  • Extending quantum system coherence time is crucial for quantum technology advancement.
  • Microscopic noise sources limit coherence, posing a significant challenge in solid-state systems.
  • A previously observed empirical limit ([Formula: see text]) has puzzled researchers for decades.

Purpose of the Study:

  • To characterize microscopic noise sources in diamond nitrogen-vacancy (NV) centers.
  • To understand the nature of the unforeseen noise spectrum limiting coherence.
  • To develop strategies to surpass the empirical limit and approach the physical coherence time limit.

Main Methods:

  • Complete noise spectroscopy was used to characterize microscopic noise sources.
  • A dynamical decoupling strategy was implemented to control decoherence.
  • Coherence times were measured across a temperature range (room temperature down to 220 K).

Main Results:

  • A previously unforeseen noise spectrum, the empirical limit ([Formula: see text]), was identified.
  • The implemented dynamical decoupling strategy successfully surpassed the empirical limit.
  • Coherence times approached the physical limit (T2 = 2T1) for NV centers.
  • The noise exhibited temperature dependence similar to spin-lattice relaxation and independence across spatial sites.

Conclusions:

  • The results suggest a decoherence mechanism dominated by spin-lattice interaction.
  • A unified and universal strategy for noise characterization and control in solid-state systems was demonstrated.
  • This work paves the way for achieving physical coherence time limits in various quantum systems.