Shallow NV centers augmented by exploiting n-type diamond

TL;DR

This paper demonstrates that using n-type diamond significantly improves the coherence time, charge stability, and creation yield of shallow NV centers, advancing their application in quantum technologies.

Contribution

The study shows that phosphorus-doped n-type diamond enhances shallow NV center properties, including longer spin coherence, better charge stability, and higher creation yield, compared to non-doped diamond.

Findings

Longest T2 of about 580 μs in shallow NV centers.

T2 in n-type diamond is 1.7 times longer than in non-doped diamond.

Charge state stabilization and doubled creation yield in n-type diamond.

Abstract

Creation of nitrogen-vacancy (NV) centers at the nanoscale surface region in diamond, while retaining their excellent spin and optical properties, is essential for applications in quantum technology. Here, we demonstrate the extension of the spin-coherence time ($\it{T}$${_2}$), the stabilization of the charge state, and an improvement of the creation yield of NV centers formed by the ion-implantation technique at a depth of $\sim$15 nm in phosphorus-doped n-type diamond. The longest $\it{T}$${_2}$ of about 580 $\mu$s of a shallow NV center approaches the one in bulk diamond limited by the nuclear spins of natural abundant $^{13}$C. The averaged $\it{T}$${_2}$ in n-type diamond is over 1.7 times longer than that in pure non-doped diamond. Moreover, the stabilization of the charge state and the more than twofold improvement of the creation yield are confirmed. The enhancements for the shallow NV centers in an n-type diamond-semiconductor are significant for future integrated quantum devices.