研究目的
To demonstrate deterministic polarization switching and spin-photon entanglement using a self-assembled negatively charged quantum dot in a low Q-factor photonic micropillar cavity, by measuring a phase shift in input single photons.
研究成果
The study demonstrates deterministic photon-emitter interactions with a phase shift of at least 2π/3, indicating viability for scalable quantum information processing. Up to 80% of photons undergo a π phase shift when on-resonance, with potential for high-fidelity polarization rotation and cluster state generation. Future work should focus on improving mode-matching and reducing spectral jitter.
研究不足
The measured phase shift is limited by mode mismatch between the input laser and cavity, QD spectral fluctuations, spin relaxation, and background scatter. Spectral jitter and imperfect mode-matching reduce the observed phase shift below the theoretical maximum.
1：Experimental Design and Method Selection:
The experiment involves coupling a narrow bandwidth laser into a QD-micropillar device in a Faraday magnetic field to induce phase shifts in reflected photons, using a conditioning technique to overcome spectral jitter.
2：Sample Selection and Data Sources:
A self-assembled negatively charged quantum dot in a low Q-factor (Q ~ 290) single-sided micropillar cavity is used, with data collected from photon detectors.
3：List of Experimental Equipment and Materials:
Equipment includes a single-frequency laser, permanent ring magnet, cryostat, objective lens (NA=0.7), beamsplitters, polarizing beamsplitters, avalanche photodiodes (APDs), and the micropillar sample.
4：7), beamsplitters, polarizing beamsplitters, avalanche photodiodes (APDs), and the micropillar sample.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Vertically polarized coherent light is input to the micropillar, and reflected photons are split into conditioning and phase measurement arms. Photon counts are binned in 100 μs intervals to measure phase shifts correlated with resonance conditions.
5：Data Analysis Methods:
Phase shift is calculated using lower bound formulas based on photon counts in V and H polarizations, with statistical analysis to account for Poissonian noise and spectral jitter.
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