Fig. 5: Experimental setup and electron spin coherence measurements. | npj Quantum Information

Fig. 5: Experimental setup and electron spin coherence measurements.

From: Modeling quantum volume using randomized benchmarking of Room-Temperature NV center quantum registers

Fig. 5

a Schematic of the experimental setup. The pulse sequences are generated by the PC and executed by the arbitrary waveform generator (AWG). The laser pulses are combined and delivered to the NV center, which is close to a permanent magnet, by an oil-immersion objective. The fluorescence is collected by the same objective, filtered by a pinhole and a longpass filter, and detected by an APD. These counts are processed by the PC. The microwave (MW) and radio frequency (RF) pulses, generated by the AWG and microwave generator, are delivered to the sample via a gold strip on the diamond surface. b T1-, c T2-, and d \({T}_{2}^{* }\)-measurement, performed on the electron spin of the NV center. The \({T}_{2}^{* }\) measurement displays two oscillations originating from the two strongly coupled carbon spins.

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