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Transform-Limited Photons From a Coherent Tin-Vacancy Spin in Diamond.

Matthew E Trusheim1, Benjamin Pingault2, Noel H Wan1

  • 1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
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Tin-vacancy (SnV) centers in diamond nanostructures exhibit excellent spin and optical properties. These quantum emitters demonstrate long spin lifetimes and coherence times at near-room temperatures, making them ideal for quantum networks.

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Area of Science:

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

Background:

  • Quantum networks require solid-state quantum emitters coupling optical transitions to long-lived spin qubits.
  • Tin-vacancy (SnV) centers in diamond are investigated as potential candidates.

Purpose of the Study:

  • To characterize the spin and optical properties of individual SnV centers in diamond nanostructures.
  • To evaluate their suitability for quantum networking applications.

Main Methods:

  • Cryogenic magneto-optical spectroscopy
  • Spin spectroscopy
  • Analysis of spin-conserving and spin-flipping transitions
  • Measurement of electron spin lifetimes and dephasing times

Main Results:

  • Verified inversion-symmetric electronic structure of SnV centers.
  • Optical transitions approach the radiative lifetime limit in nanofabricated structures.
  • Achieved spin lifetimes (T1) > 10 ms, limited by phonons with exponential temperature scaling.
  • Coherence time (T2*) reached the nuclear spin-bath limit at 2.9 K.
  • Demonstrated superior spin properties compared to other color centers at higher temperatures.

Conclusions:

  • SnV centers exhibit favorable spin and optical properties for quantum networking.
  • Long spin coherence achieved without cryogenic dilution refrigeration.
  • SnV centers are a promising candidate for scalable and feasible quantum networking applications.