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Direct generation of spatially entangled qudits using quantum nonlinear optical holography
Ofir Yesharim1, Shaul Pearl1,2, Joshua Foley-Comer1
1School of Electrical Engineering, Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel.
Science Advances
|February 24, 2023
Summary
Researchers extended nonlinear holography to the quantum realm by shaping quantum correlations of entangled photons. This breakthrough enables quantum key distribution and controllable on-chip quantum optics using spatial degrees of freedom.
Area of Science:
- Quantum Optics
- Nonlinear Optics
- Quantum Information Science
Background:
- Classical nonlinear holography manipulates light properties like amplitude and phase.
- Applications include information storage and all-optical control of beams.
- Extending these principles to the quantum regime offers new possibilities.
Purpose of the Study:
- To extend nonlinear holography into the quantum regime.
- To directly shape spatial quantum correlations of entangled photon pairs.
- To enable entanglement-based quantum key distribution.
Main Methods:
- Utilized two-dimensional patterned nonlinear photonic crystals.
- Employed spontaneous parametric down-conversion without pump shaping.
- Generated and analyzed entangled photon pairs with shaped spatial quantum correlations.
Main Results:
- Demonstrated direct shaping of spatial quantum correlations of entangled photons.
- Observed parity conservation law governing the signal-idler photon pairs.
- Showcased quantum correlations violating the Clauser-Horne-Shimony-Holt inequality.
Conclusions:
- The study successfully extends nonlinear holography to the quantum regime.
- The demonstrated method enables entanglement-based quantum key distribution.
- This work paves the way for controllable on-chip quantum optics utilizing high-dimensional spatial degrees of freedom.
