Israeli Scientists Revolutionize Quantum Computing with Light
A team of Israeli scientists, led by Jonatan Piasetzky, has developed a revolutionary component for quantum computing with light, known as photonics. The new composite segmented directional coupler (CSDC) enables the team to create a stable and reliable controlled-NOT (CNOT) gate, overcoming previous challenges in the field.
Quantum computing with photons faces obstacles in building robust quantum circuits. The research team, including Amit Rotem, Yuval Warshavsky, Yehonatan Drori, Khen Cohen, and Yaron Oz, has addressed this issue by designing a segmented composite directional coupler. This innovative design enhances robustness, reduces sensitivity to chip structure variations, and improves resilience against fabrication errors.
The team has demonstrated a fully integrated CNOT gate constructed entirely from CSDCs. This surpasses conventional uniform directional couplers in both performance and reproducibility. To achieve this, they employed coupled-mode theory simulations and fabricated around 150 isolated directional couplers to characterise single-coupler performance and extract splitting ratios. The CSDC design has proven to halve the average error rate, achieving a mean error probability of 3.01% ±0.47%. This significant reduction in errors improves the stability and accuracy of the controlled-NOT gate. The new design also exhibits reduced variability, ensuring consistent and predictable gate operation.
The team has developed a silicon-on-insulator (SOI) photonic chip that implements a CNOT gate with enhanced performance. The chip is fabricated on an SOI platform, a popular choice for integrated photonics due to its low optical loss and compatibility with existing manufacturing techniques.
The development of the composite segmented directional coupler by Jonatan Piasetzky and his team marks a significant milestone in quantum computing with light. The new design improves the stability, accuracy, and reproducibility of controlled-NOT gates, paving the way for more advanced and reliable quantum circuits in the future.
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