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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Two-photon path-entangled states in multimode waveguides.

Eilon Poem¹, Yehonatan Gilead, Yaron Silberberg

¹Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel. eilon.poem@weizmann.ac.il

Physical Review Letters

|May 17, 2012

Summary

We demonstrate that multimode waveguides can precisely control two-photon entangled states using multimode interference. These waveguides act as quantum multiport beam splitters, generating diverse entangled and separable multipath two-photon states.

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Area of Science:

Quantum optics
Photonics
Quantum information science

Background:

Two-photon entangled states are crucial for quantum information processing.
Coherent manipulation of these states in integrated photonic devices is challenging.

Purpose of the Study:

To experimentally demonstrate coherent manipulation of two-photon path-entangled states.
To investigate the use of multimode interference in multimode waveguides for quantum state control.

Main Methods:

Generating two-photon path-entangled states.
Utilizing multimode interference within multimode waveguides.
Measuring the output two-photon spatial correlation function.

Main Results:

Multimode waveguides enable coherent manipulation of two-photon path-entangled states.
Waveguides function as nearly ideal quantum multiport beam splitters.
A wide range of entangled and separable multipath two-photon states are generated.

Conclusions:

Multimode waveguides offer a promising platform for integrated quantum optical circuits.
This technique allows for the creation of diverse quantum states for advanced applications.
The findings pave the way for novel quantum technologies based on integrated photonics.