Dispersive Readout of Room Temperature Spin Qubits

• URL: http://arxiv.org/abs/2003.07562v1
• Date: Tue, 17 Mar 2020 07:14:22 GMT
• Title: Dispersive Readout of Room Temperature Spin Qubits
• Authors: J. Ebel, T. Joas, M. Schalk, A. Angerer, J. Majer, F. Reinhard
• Abstract summary: Dispersive readout of the spin of Nitrogen-Vacancy centers in a high-quality microwave resonator at room temperature. Time-dependent tracking of the spin state is demonstrated, and is employed to measure the T1 relaxation time of the spin ensemble.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate dispersive readout of the spin of an ensemble of Nitrogen-Vacancy centers in a high-quality dielectric microwave resonator at room temperature. The spin state is inferred from the reflection phase of a microwave signal probing the resonator. Time-dependent tracking of the spin state is demonstrated, and is employed to measure the T1 relaxation time of the spin ensemble. Dispersive readout provides a microwave interface to solid state spins, translating a spin signal into a microwave phase shift. We estimate that its sensitivity can outperform optical readout schemes, owing to the high accuracy achievable in a measurement of phase. The scheme is moreover applicable to optically inactive spin defects and it is non-destructive, which renders it insensitive to several systematic errors of optical readout and enables the use of quantum feedback.

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