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Published on: February 5, 2020
Tailoring entanglement through domain engineering in a lithium niobate waveguide
Yang Ming1, Ai-Hong Tan2, Zi-Jian Wu1
11] National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China [2] National Center of Microstructures and Quantum Manipulation, Nanjing University, Nanjing 210093, China.
This study integrates electro-optic tuning into lithium niobate waveguides for simultaneous photon pair generation and entanglement control. Researchers demonstrate switchable polarization-entangled photon states, paving the way for reconfigurable quantum circuits.
Area of Science:
- Quantum optics and photonics
- Materials science and engineering
- Integrated photonics
Background:
- Lithium niobate (LN) is a versatile material for photonic applications.
- On-chip integration of quantum functionalities is crucial for advanced quantum technologies.
- Spontaneous parametric down-conversion (SPDC) is a key process for generating entangled photon pairs.
Purpose of the Study:
- To integrate electro-optic (EO) tuning into domain-engineered lithium niobate (LN) waveguides.
- To achieve simultaneous photon pair generation (SPDC) and EO modulation of entanglement.
- To propose and theoretically investigate an EO tunable polarization-entangled photon source.
Main Methods:
- Domain engineering of lithium niobate waveguides.
- Simultaneous implementation of SPDC and EO interaction.
- Theoretical analysis of entanglement characteristics, including bandwidth and degree of entanglement.
Main Results:
- Demonstration of an EO tunable polarization-entangled photon source.
- Instant switching between orthogonally-polarized and parallel-polarized entangled states via applied electric fields.
- Theoretical validation of adjustable bandwidths and high entanglement degrees.
- Achievability of other reconfigurable entanglement types through domain design.
Conclusions:
- Tailoring quantum entanglement via domain engineering in LN is a highly promising approach.
- This work offers a pathway towards next-generation, function-integrated quantum circuits.
- The proposed source enables dynamic control over quantum entanglement on-chip.
