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Integrated Quantum-Walk Structure and NAND Tree on a Photonic Chip
Yao Wang1,2, Zi-Wei Cui3,4, Yong-Heng Lu1,2
1Center for Integrated Quantum Information Technologies (IQIT), School of Physics and Astronomy and State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China.
Researchers developed a novel "quantum slide" for photonic chips, enabling deterministic generation of quantum states for faster computation. This breakthrough addresses key challenges in photonic NAND-tree computing and quantum information processing.
Area of Science:
- Quantum computing
- Photonic integrated circuits
- Quantum information science
Background:
- The post-Moore era necessitates novel computing architectures, with hybrid systems including photonic chips being a promising direction.
- Quantum walks offer potential speedups for problems like the NAND-tree, crucial for universal computation, but experimental realization has been hindered by difficulties in preparing initial states.
Purpose of the Study:
- To propose and experimentally demonstrate a novel method for generating propagating initial states for photonic quantum computation.
- To overcome experimental challenges in photonic NAND-tree computation.
- To explore potential applications of the developed technique in quantum information and optics.
Main Methods:
- Introduction of a "quantum slide" structure for deterministic generation of propagating Gaussian wave packets.
- Utilizing femtosecond laser 3D direct-writing to fabricate the photonic chip.
- Experimental demonstration of an optical NAND tree capable of solving computational problems with four input bits.
Main Results:
- Successful deterministic generation of a propagating Gaussian wave packet using the quantum slide.
- Experimental validation of a four-input-bit optical NAND tree on a photonic chip.
- Removal of a significant roadblock for photonic NAND-tree computation.
Conclusions:
- The developed quantum slide provides a deterministic method for preparing initial states, crucial for advancing photonic quantum computation.
- The fabricated optical NAND tree demonstrates the potential of this approach for solving complex computational problems.
- The quantum slide technique may have broader implications for quantum information processing and quantum optics.
