Evidencing the squeezed dark nuclear spin state in lead halide perovskites

Coherent many-body states are highly promising for robust and scalable quantum information processing. While far-reaching theoretical predictions have been made for various implementations, direct experimental evidence of their appealing properties can be challenging. Here, we demonstrate coherent o...

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Bibliographic Details
Published inarXiv.org
Main Authors Kirstein, E, Smirnov, D S, Zhukov, E A, Yakovlev, D R, Kopteva, N E, Dirin, D N, Hordiichuk, O, Kovalenko, M V, Bayer, M
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 26.01.2023
Subjects
Compressing
Cryogenic temperature
Data processing
Entangled states
Lead compounds
Metal halides
Nuclear spin
Optical properties
Optical pumping
Perovskites
Quantum entanglement
Quantum phenomena
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Summary:Coherent many-body states are highly promising for robust and scalable quantum information processing. While far-reaching theoretical predictions have been made for various implementations, direct experimental evidence of their appealing properties can be challenging. Here, we demonstrate coherent optical manipulation of the nuclear spin ensemble in the lead halide perovskite semiconductor FAPbBr\(_3\) (FA=formamidinium), targeting a long-postulated collective dark state that is insensitive to optical pumping. Via optical orientation of localized hole spins we drive the nuclear many-body system into an entangled state, requiring a weak magnetic field of only a few Millitesla strength at cryogenic temperatures. During its fast build-up, the nuclear polarization along the optical axis remains small, while the transverse nuclear spin fluctuations are strongly reduced, corresponding to spin squeezing as evidenced by a strong violation of the generalized nuclear squeezing-inequality with \(\xi_s < 0.3\). The dark state evidenced in this process corresponds to an approximately 750-body entanglement between the nuclei. Dark nuclear spin states can be exploited to store quantum information benefiting from their long-lived many-body coherence and to perform quantum measurements with a precision beyond the standard limit.
ISSN:2331-8422