Quantum state tomography of a single electron spin in diamond with Wigner reconstruction

Abstract

We present the experimental reconstruction of the Wigner function of an individual electronic spin qubit associated with a nitrogen-vacancy (NV) center in diamond at room temperature. This spherical Wigner function contains the same information as the density matrix for arbitrary spin systems. As an example, we exactly characterize the quantum state of a single qubit undergoing a nearly pure dephasing process by Wigner function. The fidelities and purities during this process are extracted from the experimental reconstructed Wigner functions, whose dynamics agree with the theoretical prediction. Our method can be applied to multi-qubit systems for measuring the Wigner function of their collective spin state.

arXiv comment5 pages, 4 figures

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• Calibration-Free Vector Magnetometry Using Nitrogen-Vacancy Center in Diamond Integrated with Optical Vortex Beam
• Detecting dynamical quantum phase transition via out-of-time-order correlations in a solid-state quantum simulator
• New Phase Space Formulations and Quantum Dynamics Approaches
• Machine-learning-assisted electron-spin readout of nitrogen-vacancy center in diamond
• Quantum speed limits in arbitrary phase spaces
• Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders
• Polytopes of Absolutely Wigner Bounded Spin States
• Study of the spin kitten states in a strongly coupled spin-oscillator system