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Paper   IPM / Physic / 16246
School of Physics
  Title:   Progress toward cryogen-free spin-photon interfaces based on nitrogen-vacancy centers and optomechanics
1.  R. Ghobadi
2.  S. Wein
3.  H.R. Kaviani
4.  P. Barclay
5.  Ch. Simon
  Status:   Published
  Journal: Phys. Rev. A
  Vol.:  99
  Year:  2019
  Pages:   053825
  Supported by:  IPM
The implementation of quantum networks involving quantum memories and photonic channels without the need for cryogenics would be a major technological breakthrough. Nitrogen-vacancy centers have excellent spin properties even at room temperature, but phonon-induced broadening makes it challenging to coherently interface these spins with photons at noncryogenic temperatures. Inspired by recent progress in achieving high mechanical quality factors, we propose that this challenge can be overcome using spin-optomechanical transduction. We quantify the coherence of the interface by calculating the indistinguishability and single-photon purity of photons emitted from such a device and describe promising paths towards experimental implementation. Our results show that for ultrahigh mechanical quality factor frequency products, as have recently been achieved, our proposed interface could generate single photons with high indistinguishability and efficiency without cryogenic cooling, an important step towards room-temperature quantum networks.

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