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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Collision-Induced Broadband Optical Nonreciprocity.

Chao Liang¹, Bei Liu¹, An-Ning Xu¹

¹State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.

Physical Review Letters

|October 5, 2020

Summary

Thermal atomic collisions unexpectedly induce broadband optical nonreciprocity. This magnet-free and cavity-free method achieves high isolation and low loss, advancing optical device technology.

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Area of Science:

Optics
Atomic Physics
Quantum Optics

Background:

Optical nonreciprocity is crucial for devices like isolators and circulators.
Achieving nonreciprocity typically requires breaking Lorentz reciprocity with magnetic fields or complex cavities.
Thermal atomic collisions are usually considered detrimental in optical studies.

Purpose of the Study:

To investigate the potential of thermal atomic collisions for inducing optical nonreciprocity.
To demonstrate a novel, magnet-free, and cavity-free approach to optical nonreciprocity.
To characterize the performance of this new method in terms of isolation, bandwidth, and loss.

Main Methods:

Experimentally exploiting the collision effect of thermal atoms.
Utilizing atomic collisions to break symmetry and achieve nonreciprocity.
Measuring isolation ratio, insertion loss, and bandwidth of the induced nonreciprocity.

Main Results:

Observed broadband optical nonreciprocity induced by thermal atomic collisions.
Achieved a maximum isolation ratio close to 40 dB with less than 1 dB insertion loss.
Demonstrated an ultrabroad bandwidth exceeding 1.2 GHz for an isolation ratio over 20 dB, significantly wider than conventional methods.

Conclusions:

Thermal atomic collisions offer a viable mechanism for broadband optical nonreciprocity.
This method provides a high-performance, magnet-free, and cavity-free alternative for optical nonreciprocal devices.
The findings open new avenues for integrated optics and quantum network applications.