Efficient Readout of a Single Spin State in Diamond via Spin-to-Charge Conversion

March 31, 2015
Fig. 1

Fig 1: SCC measurement idea. [Reprinted by permission from APS*].

In a new paper* in Physical Review Letters, postdoc Brendan Shields, together with colleagues Quirin Unterreithmeier, Nathalie de Leon, Prof. Hongkun Park and Prof. Mikhail Lukin, demonstrate a new method for efficient spin readout of nitrogen-vacancy (NV) centers in diamond.

Efficient readout of individual electronic spins associated with atomlike impurities in the solid state is essential for applications in quantum information processing and quantum metrology. The new method is based on conversion of the electronic spin state of the NV to a charge-state distribution, followed by single-shot readout of the charge state. Conversion is achieved through a spin-dependent photoionization process in diamond at room temperature. Using NVs in nanofabricated diamond beams, teh authors demonstrate that the resulting spin readout noise is within a factor of 3 of the spin projection noise level and discuss applications of this technique for nanoscale magnetic sensing.

*B.J. Shields, Q.P. Unterreithmeier, N.P. de Leon, H. Park, and M.D. Lukin, "Efficient Readout of a Single Spin State in Diamond via Spin-to-Charge Conversion," Phys. Rev. Lett. 114, 136402 (2015) DOI: http://dx.doi.org/10.1103/PhysRevLett.114.136402