Continuous dynamical decoupling of a single diamond nitrogen-vacancy center spin with a mechanical resonator

Abstract

Inhomogeneous dephasing from uncontrolled environmental noise can limit the coherence of a quantum sensor or qubit. For solid state spin qubits such as the nitrogen-vacancy (NV) center in diamond, a dominant source of environmental noise is magnetic field fluctuations due to nearby paramagnetic impurities and instabilities in a magnetic bias field. In this work, we use ac stress generated by a diamond mechanical resonator to engineer a dressed spin basis in which a single NV center qubit is less sensitive to its magnetic environment. For a qubit in the thermally isolated subspace of this protected basis, we prolong the dephasing time $T_2^{\ast }$ from $2.7\pm 0.1$ $\mu$s to $15\pm 1$ $\mu$s by dressing with a $\Omega =581\pm 2$ kHz mechanical Rabi field. Furthermore, we develop a model that quantitatively predicts the relationship between $\Omega$ and $T_2^{\ast }$ in the dressed basis. Our model suggests that a combination of magnetic field fluctuations and hyperfine coupling to nearby nuclear spins limits the protected coherence time over the range of $\Omega$ accessed here. We show that amplitude noise in $\Omega$ will dominate the dephasing for larger driving fields.

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• Topical Review: Spins and mechanics in diamond
• Double-quantum spin-relaxation limits to coherence of near-surface nitrogen-vacancy centers
• Spin-strain interaction in nitrogen-vacancy centers in diamond
• Universal coherence protection in a solid-state spin qubit
• Competition between electric field and magnetic field noise in the decoherence of a single spin in diamond
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• Microscopic imaging of elastic deformation in diamond via in-situ stress tensor sensors
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• Optimized Planar Microwave Antenna for Nitrogen Vacancy Center based Sensing Applications
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• \emph{Ab initio} spin-strain coupling parameters of divacancy qubits in silicon carbide
• Correlating dynamic strain and photoluminescence of solid-state defects with stroboscopic x-ray diffraction microscopy
• Hybrid continuous dynamical decoupling: a photon-phonon doubly dressed spin
• Spin-phonon interfaces in coupled nanomechanical cantilevers
• Multi-phonon interactions between nitrogen-vacancy centers and nanomechanical resonators
• Steady-state squeezing transfer in hybrid optomechanics
• Honeycomb Phononic Networks with Closed Mechanical Subsystems
• BPZT HBARs for bias-tunable, stress generation at GHz frequencies
• Bayesian-based hybrid method for rapid optimization of NV center sensors
• Selective acoustic control of photon-mediated qubit-qubit interactions
• Quantum Sensing Enhancement through a Nuclear Spin Register in Nitrogen-Vacancy Centers in Diamond
• openMMF: a library for multimode driven quantum systems
• Quantum information processing with nuclear spins mediated by a weak-mechanically controlled electron spin
• Interplay between dressed and strong-axial-field states in Nitrogen-Vacancy centers for quantum sensing and computation
• Spin-photon Qubits for Scalable Quantum Network