Broadband Frequency Conversion



Quantum information technology is being advanced. This equates to faster and more efficient data transfer. Qubits have made progress challenging. Qubits are units of quantum information. They can be transferred between different wavelengths without losing their properties (like coherence and entanglement).

Researchers have developed a new technique for broadband frequency conversion. It was recently reported in Advanced Physics. Scientists from Shanghai Jiao Tong University (SJTU) are working on this crucial step for future quantum networks.  

The team used an X-cut film of lithium niobate (TFLN). This material is known for its nonlinear optical properties.  They proved an important process for converting light from one wavelength to another. This process is called second-harmonic generation. The team's bandwidth was a remarkable 13 nanometers. Scientists used a technique called mode hybridization. This allows for precise control over the frequency conversion.

Professor Yuping Chen is a corresponding author. He reports, "An efficient second-order nonlinear process with widely tunable pump bandwidth has been a long-pursued goal, owing to the extensive applications in wavelength division multiplexing networks, ultrashort pulse nonlinearity, quantum key distribution and broadband single-photon source generation. Thanks to the great progress in fabrication technology on the TFLN platform, this work will pave the way to chip-scale nonlinear frequency conversion between the ultrashort optical pulses and even the quantum states."

This opens the door for improvement in quantum light sources, and more efficient multichannel optical information processing!

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