Enhancement of quantum coherence in solid-state qubits via interface engineering
arXiv:2507.02312 · doi:10.1038/s41467-025-61026-3
Abstract
Shallow nitrogen-vacancy (NV) centers in diamond are promising quantum sensors but suffer from noise-induced short coherence times due to bulk and surface impurities. We present interfacial engineering via oxygen termination and graphene patching, extending shallow NV coherence to over 1 ms, approaching the T1 limit. Raman spectroscopy and density-functional theory reveal surface termination-driven graphene charge transfer reduces spin noise by pairing surface electrons, supported by double electron-electron resonance spectroscopy showing fewer unpaired spins. Enhanced sensitivity enables detection of single weakly coupled 13C nuclear spins and external 11B spins from a hexagonal boron nitride (h-BN) layer, achieving nanoscale nuclear magnetic resonance. A protective h-BN top layer stabilizes the platform, ensuring robustness against harsh treatments and compatibility with target materials. This integrated approach advances practical quantum sensing by combining extended coherence, improved sensitivity, and device durability.
References in corpus (14)
- Advanced capabilities for materials modelling with Quantum ESPRESSO
- Boron nitride substrates for high-quality graphene electronics
- Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
- High-sensitivity diamond magnetometer with nanoscale resolution
- Electric Field Effect Tuning of Electron-Phonon Coupling in Graphene
- Non-adiabatic Kohn-anomaly in a doped graphene monolayer
- Detection and control of individual nuclear spins using a weakly coupled electron spin
- Spectroscopy of Surface-Induced Noise Using Shallow Spins in Diamond
- Raman imaging of doping domains in graphene on SiO2
- Diamond surface engineering for molecular sensing with nitrogen-vacancy centers
- Single DNA Electron Spin Resonance Spectroscopy in Aqueous Solutions
- Optical activation and detection of charge transport between individual color centers in room-temperature diamond
- Shallow NV centers augmented by exploiting n-type diamond
- Magnetic field noise analyses generated by the interactions between a nitrogen vacancy center diamond and surface and bulk impurities