High precision single qubit tuning via thermo-magnetic field control

Abstract

Precise control of the resonant frequency of a spin qubit is of fundamental importance to quantum sensing protocols. We demonstrate a control technique on a single nitrogen-vacancy (NV) centre in diamond where the applied magnetic field is modified by fine-tuning a permanent magnet's magnetisation via temperature control. Through this control mechanism, nanoscale cross-relaxation spectroscopy of both electron and nuclear spins in the vicinity of the NV centre are performed. We then show that through maintaining the magnet at a constant temperature an order of magnitude improvement in the stability of the NV qubit frequency can be achieved. This improved stability is tested in the polarisation of a small ensemble of nearby ${}^{13}$C spins via resonant cross-relaxation and the lifetime of this polarisation explored. The effectiveness and relative simplicity of this technique may find use in the realisation of portable spectroscopy and/or hyperpolarisation systems.

8 pages, 6 figures including Supporting Information

References in corpus (7)

• Sub-millihertz magnetic spectroscopy with a nanoscale quantum sensor
• Quantum sensing with arbitrary frequency resolution
• Towards hyperpolarization of oil molecules via nitrogen-vacancy centers in diamond
• Quantum probe hyperpolarisation of molecular nuclear spins
• Spin dynamics of diamond nitrogen-vacancy centres at the ground state level anti-crossing and all-optical low frequency magnetic field sensing
• Nuclear Quantum-Assisted Magnetometer
• Environmentally mediated coherent control of a spin qubit in diamond

Cited by in corpus (6)

• Quantum Diamond Radio Frequency Signal Analyser based on Nitrogen-Vacancy centers
• All-Optical Nuclear Quantum Sensing using Nitrogen-Vacancy Centers in Diamond
• Apparent delocalisation of the current flow in metallic wires observed with diamond nitrogen-vacancy magnetometry
• The non-vanishing effect of detuning errors in dynamical decoupling based quantum sensing experiments
• Quantum bath control with nuclear spin state selectivity via pulse-adjusted dynamical decoupling
• Temperature selective thermometry with sub-microsecond time resolution using dressed-spin states in diamond