Optimal photon energies for initialization of hybrid spin quantum registers of NV centers in diamond

Abstract

Initializing quantum registers with high fidelity is a fundamental precondition for many applications like quantum information processing and sensing. The electronic and nuclear spins of a Nitrogen-Vacancy (NV) center in diamond form an interesting hybrid quantum register that can be initialized by a combination of laser, microwave, and radio-frequency pulses. However, the laser illumination, which is necessary for achieving electron spin polarization, also has the unwanted side-effect of depolarizing the nuclear spin. Here, we study how the depolarization dynamics of the ${}^{14}$N nuclear spin depends on the laser wavelength. We show experimentally that excitation with an orange laser (594 nm) causes significantly less nuclear spin depolarization compared to the green laser (532 nm) typically used for excitation and hence leads to higher nuclear spin polarization. This could be because orange light excitation inhibits ionization of NV${}^0$ into NV${}^{-}$ and therefore suppresses one source of noise acting on the nuclear spin.

arXiv comment6 pages, 6 figures, 1 table

References in corpus (21)

• The nitrogen-vacancy colour centre in diamond
• Quantum error correction in a solid-state hybrid spin register
• Photo induced ionization dynamics of the nitrogen vacancy defect in diamond investigated by single shot charge state detection
• Universal control and error correction in multi-qubit spin registers in diamond
• Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature
• Entanglement in a Solid State Spin Ensemble
• Violation of a temporal Bell inequality for single spins in solid by over 50 standard deviations
• Bulk Nuclear Polarization Enhanced at Room-Temperature by Optical Pumping
• High resolution spectroscopy of single NV defects coupled with nearby ${}^{13}$C nuclear spins in diamond
• Local and bulk 13C hyperpolarization in NV-centered diamonds at variable fields and orientations
• Single-shot readout of multiple nuclear spin qubits in diamond under ambient conditions
• Enhanced dynamic nuclear polarization via swept microwave frequency combs
• Multi-spin-assisted optical pumping of bulk 13C nuclear spin polarization in diamond
• Room-temperature high-speed nuclear-spin quantum memory in diamond
• Measurement of transverse hyperfine interaction by forbidden transitions
• Experimental protection of 2-qubit quantum gates against environmental noise by dynamical decoupling
• Polarizing the electronic and nuclear spin of the NV-center in diamond in arbitrary magnetic fields: analysis of the optical pumping process
• Characterization of hyperfine interaction between an NV electron spin and a first-shell 13C nuclear spin in diamond
• Recursive polarization of nuclear spins in diamond at arbitrary magnetic fields
• Optically detected nuclear quadrupolar interaction of 14N in nitrogen-vacancy centers in diamond
• Dynamically Polarizing Spin Register of NV Centers in Diamond using Chopped Laser Pulses

Cited by in corpus (5)

• Nuclear Spin Gyroscope based on the Nitrogen Vacancy Center in Diamond
• Efficient Implementation of a Quantum Algorithm in a Single Nitrogen Vacancy Center of Diamond
• Quantum spin chains with fractional revival
• Optimization of a quantum control sequence for initializing an NV spin register
• Optimal microwave control pulse for nuclear spin polarization and readout in dense nitrogen-vacancy ensembles in diamond