Multi-shot readout error benchmark of the nitrogen-vacancy center's electronic qubit

Abstract

The ground-state electronic spin of a negatively charged nitrogen-vacancy center in diamond can be used for room-temperature experiments showing coherent qubit functionality. At room temperature, photoluminescence-based qubit readout has a low single-shot fidelity; however, the populations of the qubit's two basis states can be inferred using multi-shot readout. In this work, we calculate the dependence of the error of a multi-shot inference method on various parameters of the readout process. This multi-shot readout error scales as $\Delta /\sqrt{N}$, with $N$ being the number of shots, suggesting to use the coefficient $\Delta$ as a simple multi-shot readout error benchmark. Our calculation takes into account background photons, photon loss, and initialization error. Our model enables the identification of the readout error budget, i.e., the role various imperfections play in setting the readout error. Our results enable experimentalists and engineers to focus their efforts on those hardware improvements that yield the highest performance gain for multi-shot readout.

12 pages, 4 figues

References in corpus (13)

• High-sensitivity diamond magnetometer with nanoscale resolution
• High-fidelity projective readout of a solid-state spin quantum register
• Scalable quantum register based on coupled electron spins in a room temperature solid
• Decoherence-protected quantum gates for a hybrid solid-state spin register
• Spin dynamics in the optical cycle of single nitrogen-vacancy centres in diamond
• Efficient readout of a single spin state in diamond via spin-to-charge conversion
• Three megahertz photon collection rate from an NV center with millisecond spin coherence
• Room-temperature manipulation and decoherence of a single spin in diamond
• Exploiting ionization dynamics in the nitrogen vacancy center for rapid, high-contrast spin and charge state initialization
• Machine-learning-assisted electron-spin readout of nitrogen-vacancy center in diamond
• Soft Decoding of a Qubit Readout Apparatus
• Observing hyperfine interactions of NV centers in diamond in an advanced quantum teaching lab
• Modeling Quantum Volume Using Randomized Benchmarking of Room-Temperature NV Center Quantum Registers