Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble

Klimov, Paul V.; Falk, Abram L.; Christle, David J.; Dobrovitski, Viatcheslav V.; Awschalom, David D.

doi:10.1126/sciadv.1501015

Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble

Journal Article · Fri Nov 20 00:00:00 EST 2015 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1501015· OSTI ID:1625951

Klimov, Paul V. ^[1]; ^[2]; ^[3]; Dobrovitski, Viatcheslav V. ^[4]; Awschalom, David D. ^[5]

Univ. of Chicago, IL (United States). Inst. for Molecular Engineering; Univ. of California, Santa Barbara, CA (United States). Dept. of Physics; DOE/OSTI
Univ. of Chicago, IL (United States). Inst. for Molecular Engineering; IBM, Yorktown Heights, NY (United States). Thomas J. Watson Research Center
Univ. of Chicago, IL (United States). Inst. for Molecular Engineering; Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Univ. of Chicago, IL (United States). Inst. for Molecular Engineering

Entanglement is a key resource for quantum computers, quantum-communication networks, and high-precision sensors. Macroscopic spin ensembles have been historically important in the development of quantum algorithms for these prospective technologies and remain strong candidates for implementing them today. This strength derives from their long-lived quantum coherence, strong signal, and ability to couple collectively to external degrees of freedom. Nonetheless, preparing ensembles of genuinely entangled spin states has required high magnetic fields and cryogenic temperatures or photochemical reactions. We demonstrate that entanglement can be realized in solid-state spin ensembles at ambient conditions. We use hybrid registers comprising of electron-nuclear spin pairs that are localized at color-center defects in a commercial SiC wafer. We optically initialize 10³ identical registers in a 40-μm³ volume (with 0.95$$_{-0.07}^{+0.05}$$ fidelity) and deterministically prepare them into the maximally entangled Bell states (with 0.88 ± 0.07 fidelity). To verify entanglement, we develop a register-specific quantum-state tomography protocol. The entanglement of a macroscopic solid-state spin ensemble at ambient conditions represents an important step toward practical quantum technology.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1625951

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 10 Vol. 1; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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