Tailoring entanglement through domain engineering in a lithium niobate waveguide.
We propose to integrate the electro-optic (EO) tuning function into on-chip domain engineered lithium niobate (LN) waveguide. Due to the versatility of LN, both the spontaneously parametric down conversion (SPDC) and EO interaction could be realized simultaneously. Photon pairs are generated through SPDC, and the formation of entangled state is modulated by EO processes. An EO tunable polarization-entangled photon state is proposed. Orthogonally-polarized and parallel-polarized entanglements of photon pairs are instantly switchable by tuning the applied field. The characteristics of the source are theoretically investigated showing adjustable bandwidths and high entanglement degrees. Moreover, other kinds of reconfigurable entanglement are also achievable based on suitable domain-design. We believe tailoring entanglement based on domain engineering is a very promising solution for next generation function-integrated quantum circuits.
1] 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.
Yang
Y
Ming
Laboratory for Quantum Information, China Jiliang University, Hangzhou 310018, China.
Ai-Hong
AH
Tan
1] 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.
Zi-Jian
ZJ
Wu
1] 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.
Zhao-Xian
ZX
Chen
1] 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.
Fei
F
Xu
1] 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.
Yan-Qing
YQ
Lu