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Updated: Jul 12, 2025
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
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The squeezed dark nuclear spin state in lead halide perovskites
E Kirstein1, D S Smirnov2, E A Zhukov3
1Experimental Physics 2, Department of Physics, TU Dortmund, 44227, Dortmund, Germany. erik.kirstein@tu-dortmund.de.
Nature Communications
|October 21, 2023
Summary
Researchers created a collective dark state in a perovskite semiconductor, achieving ~35-body entanglement for robust quantum information processing. This nuclear spin squeezing demonstrates potential for enhanced quantum measurements and information storage.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
- Materials Science
Background:
- Coherent many-body states are crucial for quantum information processing.
- Experimental realization of these states, especially entangled ones, presents significant challenges.
- Lead halide perovskites offer a promising platform for exploring quantum phenomena.
Purpose of the Study:
- To experimentally demonstrate the creation and properties of a collective dark state in a nuclear spin ensemble.
- To investigate the potential of this dark state for quantum information processing applications.
- To achieve nuclear spin squeezing and entanglement in a solid-state system.
Main Methods:
- Optical manipulation of localized hole spins in FAPbBr3 (formamidinium lead bromide) at cryogenic temperatures.
- Application of a weak magnetic field (few milli-Tesla) to drive the nuclear spin system.
- Measurement of nuclear spin squeezing via violation of the generalized nuclear squeezing-inequality (ξs < 0.5).
Main Results:
- Successful creation of a collective dark state in the nuclear spin ensemble of FAPbBr3.
- Demonstration of ~35-body entanglement within the nuclear spin system.
- Observation of spin squeezing, indicated by a strong violation of the squeezing-inequality (ξs < 0.5).
- The dark state is insensitive to optical pumping after its formation.
Conclusions:
- The study provides direct experimental evidence of a long-postulated collective dark state in a perovskite semiconductor.
- This dark state exhibits properties suitable for robust quantum information storage and high-precision quantum measurements.
- The findings pave the way for utilizing nuclear spin ensembles in perovskites for advanced quantum technologies.
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