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.
Title: The squeezed dark nuclear spin state in lead halide perovskites
Language (ISO): en
Abstract: Coherent many-body states are highly promising for robust 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 optical manipulation of the nuclear spin ensemble in the lead halide perovskite semiconductor FAPbBr3 (FA = formamidinium), targeting a long-postulated collective dark state that is insensitive to optical pumping after its build-up. Via optical orientation of localized hole spins we drive the nuclear many-body system into this entangled state, requiring a weak magnetic field of only a few milli-Tesla strength at cryogenic temperatures. During its fast establishment, 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 ξs < 0.5. The dark state corresponds to an ~35-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.
Subject Headings: Quantum information
Quantum mechanics
Subject Headings (RSWK): Quantenmechanik
Issue Date: 2023-10-21
Rights link:
Appears in Collections:Experimentelle Physik II

Files in This Item:
File Description SizeFormat 
s41467-023-42265-8.pdfDNB1.44 MBAdobe PDFView/Open

This item is protected by original copyright

This item is licensed under a Creative Commons License Creative Commons