Electrically tunable on-chip quantum Deutsch-Jozsa algorithm with lithium niobate metasurfaces.

Area of Science:

• Quantum computing
• Optical computing
• Metamaterials

Background:

• Optical analog computing offers advantages in speed and energy efficiency.
• Quantum optical computing surpasses classical computing for specific tasks.
• Existing metamaterial-based quantum Deutsch-Jozsa (DJ) algorithm devices are bulky and lack reconfigurability.

Purpose of the Study:

• To develop a miniaturized, electrically tunable on-chip DJ algorithm device.
• To overcome limitations of existing bulky and monofunctional quantum computing devices.
• To enable functional reconfiguration in quantum optical computing systems.

Main Methods:

• Fabrication of an on-chip DJ algorithm device on a lithium-niobate-on-insulator (LNOI) platform.
• Utilizing etched slots with precisely designed sizes on the metasurface.
• Applying external voltages to individual units for tunable phase redistribution.

Main Results:

• Demonstrated an electrically tunable on-chip DJ algorithm device.
• Achieved precise phase control for realizing the tunable DJ algorithm.
• Successfully determined function type (constant or balance) by measuring output electric field.

Conclusions:

• The developed on-chip device is miniaturized, easily integrated, and functionally reconfigurable.
• This work paves the way for advanced applications in optical computing.
• Enables sophisticated optical systems with tunable quantum algorithms.