研究目的
To demonstrate high degree of polarization of 13C nuclear spins weakly interacting with nitrogen-vacancy (NV) centers in diamond and to explore the applicability of this method for quantum information processing and quantum-sensing applications.
研究成果
The study demonstrates an efficient and versatile method for polarizing weakly coupled nuclear spins in diamond, achieving a polarization degree higher than 85% at room temperature. This method provides a promising route for high-fidelity initialization of spin registers and quantum metrology applications.
研究不足
The method is limited to nuclear spins weakly coupled to NV centers and requires careful tuning of the external magnetic field for optimal polarization. The polarization efficiency may vary with the hyperfine interaction strength and the relative position of the nuclear spin to the NV center.
1：Experimental Design and Method Selection:
The study combines coherent microwave excitation pulses with optical illumination to achieve nuclear polarization. The methodology involves the use of selective microwave π pulses and chopped laser pulses for controlled relaxation.
2：Sample Selection and Data Sources:
A CVD-grown high-purity type-IIa bulk diamond with nitrogen concentration <10 ppb and natural abundance of 13C (～1.1%) was used. NV centers located roughly 2 μm below the {110}-oriented surface were investigated.
3：1%) was used. NV centers located roughly 2 μm below the {110}-oriented surface were investigated.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A home-built confocal microscope, a coplanar waveguide for applying control pulses, a 532 nm diode pumped laser, an acousto-optic modulator, a two-axis galvano mirror, a single photon counter module, and a neodymium magnet for external magnetic field alignment.
4：Experimental Procedures and Operational Workflow:
The NV center was initialized to its ms=0 state by a 5 μs pulsed illumination of the 532 nm green laser. A polarization sequence comprising chopped laser and microwave application was repeated N=6 times for the saturation of the polarization. Ramsey spectroscopy was used to measure the degree of polarization.
5：Data Analysis Methods:
The degree of polarization was quantified by fitting the FFT of the Ramsey data to two Lorentzian functions with different center frequencies.
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