Qubit Zoo

Quantum control of the tin-vacancy spin qubit in diamond

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First demonstration of coherent spin control of a SnV⁻ center in diamond at 1.7 K — accessible with a standard ³He cryostat rather than a dilution refrigerator. The larger spin-orbit splitting of SnV suppresses phonon-mediated relaxation at higher temperatures.

Key Results

  • T₂ (Hahn echo): 0.3 ms at 1.7 K
  • Coherent spin manipulation via microwave driving
  • Operating temperature: 1.7 K (³He, vs 100 mK for SiV)
  • Optical linewidth: near transform-limited

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