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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Tunable single emitter-cavity coupling strength through waveguide-assisted energy quantum transfer.

Yuan Liu¹, Hongwei Zhou¹, Linhan Lin²

¹Department of Precision Instrument, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing, 100084, China.

Light, Science & Applications

|July 18, 2024

Summary

We introduce waveguide-assisted energy quantum transfer (WEQT) to enhance single emitter-cavity coupling for quantum technology. This method improves coupling strength, easing cavity design requirements and enabling new quantum manipulation possibilities.

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Area of Science:

Quantum optics
Quantum technology
Cavity quantum electrodynamics

Background:

Emitter-cavity strong coupling is vital for quantum technology, particularly with individual emitters.
Current limitations include stringent requirements on cavity quality factor and optical density of states due to small light-matter interaction cross-sections.

Purpose of the Study:

To present a novel strategy, waveguide-assisted energy quantum transfer (WEQT), to enhance single emitter-cavity coupling strength.
To overcome the limitations imposed by small interaction cross-sections and harsh cavity design requirements.

Main Methods:

Utilizing multiple ancillary emitters optically linked by a waveguide.
Establishing an indirect energy quantum transfer channel between a target emitter and a cavity.

Main Results:

Achieved significant enhancement in coupling strength, relaxing the need for high-quality cavities.
Demonstrated the potential for ancillae to function as controlling bits for a photon gate.

Conclusions:

WEQT effectively improves single emitter-cavity coupling, broadening applicability in quantum technologies.
The proposed method offers new avenues for quantum manipulation and control using ancillary emitters.