Solid-state electron spin lifetime limited by phononic vacuum modes

Abstract

Longitudinal relaxation is the process by which an excited spin ensemble decays into its thermal equilibrium with the environment. In solid-state spin systems relaxation into the phonon bath usually dominates over the coupling to the electromagnetic vacuum. In the quantum limit the spin lifetime is determined by phononic vacuum fluctuations. However, this limit was not observed in previous studies due to thermal phonon contributions or phonon-bottleneck processes. Here we use a dispersive detection scheme based on cavity quantum electrodynamics (cQED) to observe this quantum limit of spin relaxation of the negatively charged nitrogen vacancy (${\mathrm{NV}}^{-}$) centre in diamond. Diamond possesses high thermal conductivity even at low temperatures, which eliminates phonon-bottleneck processes. We observe exceptionally long longitudinal relaxation times $T_1$ of up to 8h. To understand the fundamental mechanism of spin-phonon coupling in this system we develop a theoretical model and calculate the relaxation time ab initio. The calculations confirm that the low phononic density of states at the ${\mathrm{NV}}^{-}$ transition frequency enables the spin polarization to survive over macroscopic timescales.

References in corpus (17)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Spins in few-electron quantum dots
• Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems
• Resolving photon number states in a superconducting circuit
• Electron spin coherence exceeding seconds in high purity silicon
• Spin dynamics in semiconductors
• Temperature and magnetic field dependent longitudinal spin relaxation in nitrogen-vacancy ensembles in diamond
• Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble
• Cavity QED with magnetically coupled collective spin states
• Ab initio supercell calculations on nitrogen-vacancy center in diamond: its electronic structure and hyperfine tensors
• Two-dimensional phononic-photonic bandgap optomechanical crystal cavity
• The temperature shifts of the resonances of the NV- center in diamond
• Controlling spin relaxation with a cavity
• Strong magnetic coupling of an inhomogeneous NV ensemble to a cavity
• Collective Strong Coupling with Homogeneous Rabi Frequencies using a 3D Lumped Element Microwave Resonator
• Reexamination of the Elliott-Yafet spin-relaxation mechanism
• Creation of ensembles of nitrogen-vacancy centers in diamond by neutron and electron irradiation

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