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Multifrequency multi-qubit entanglement based on plasmonic hot spots.

Jun Ren¹, Tong Wu¹, Xiangdong Zhang¹

¹School of Physics and Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, Beijing Institute of Technology, 100081, Beijing, China.

Scientific Reports

|September 10, 2015

Summary

Researchers explored quantum entanglement using nanoparticle clusters. They found that multi-qubit entanglement can be generated and sustained for longer durations compared to photonic cavities, originating from collective resonance excitation.

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Area of Science:

Quantum physics
Plasmonics
Nanotechnology

Background:

Strong coupling between quantum emitters and plasmons is crucial for quantum technologies.
Nanoparticle clusters offer unique electromagnetic field enhancements (hot spots).

Purpose of the Study:

To theoretically investigate strong coupling between quantum emitters and surface plasmons in nanoparticle clusters.
To demonstrate the generation and characteristics of multi-qubit entanglement in this system.

Main Methods:

Utilized a rigorous first-principles electromagnetic Green's tensor technique.
Analyzed the behavior of two-level quantum emitters within the hot spots of metallic nanoparticle clusters.

Main Results:

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Successfully demonstrated the production of multi-qubit entanglement at specific coupling resonance frequencies.

Observed entanglement durations two orders of magnitude longer than those in photonic cavities.

Attributed the extended entanglement duration to collective coupling resonance excitation of the nanoparticle cluster.

Conclusions:

Nanoparticle clusters can facilitate robust and long-lasting multi-qubit entanglement.
Collective resonance effects in nanoparticle clusters are key to enhancing entanglement.
Single scattering resonance does not support entanglement generation despite high spontaneous decay rates.