研究目的
To experimentally demonstrate frequency-degenerate four-photon entangled state generation based on a single silicon nanowire and to show its application in achieving phase super-resolution.
研究成果
The work successfully demonstrated an effective and convenient way to achieve a frequency-degenerate four-photon quantum state using silicon photonics, with potential applications in quantum metrology. The approach could be further integrated on a single chip, improving source brightness and stability for practical applications in quantum algorithms and related quantum information processes.
研究不足
The multiphoton entangled state demonstrated is not optimal, with room for improvement in the quality of multi-photon states and fringe measurement. The fiber filters used have fixed bandwidths and center wavelengths, not perfectly matched between the pre-filters and post-filters.
1：Experimental Design and Method Selection:
The experiment utilized a silicon nanowire within a Sagnac loop to generate polarization encoded entangled states. Quantum interference and state tomography techniques were employed for analysis.
2：Sample Selection and Data Sources:
A single silicon nanowire 1 cm in length was used as the nonlinear material for generating photon pairs.
3：List of Experimental Equipment and Materials:
The setup included a femtosecond erbium laser, wavelength-division-multiplexing systems, fiber filters, erbium-doped fiber amplifier, silicon spiral nanophotonic waveguide, and superconducting nanowire single-photon detectors.
4：Experimental Procedures and Operational Workflow:
The pump pulses were precisely timed and polarized to generate degenerate photon pairs. The generated states were then analyzed for quantum interference and state tomography.
5：Data Analysis Methods:
The quality of the generated quantum states was determined through quantum state tomography, using maximum-likelihood-estimation method to reconstruct the density matrix.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
