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DOE OSTI · 3391367

Defect in diamond with millisecond-scale spin relaxation time at room temperature

Mukherjee, Sounak [Princeton Univ., NJ (United States)]·Li, Anran [Princeton Univ., NJ (United States)]·Eberle, Johannes [Princeton Univ., NJ (United States)]·Karg, Sean [Princeton Univ., NJ (United States)]·Zhang, Zi-Huai [Princeton Univ., NJ (United States)]·Feldman, Mayer M. [Princeton Univ., NJ (United States)]·Chen, Yilin [Univ. of California, Santa Barbara, CA (United States)]·Turiansky, Mark E. [Univ. of California, Santa Barbara, CA (United States); Naval Research Lab. (NRL), Washington, DC (United States)] (ORCID:0000000291543582)·Wang, Mengen [Univ. of California, Santa Barbara, CA (United States); University of North Carolina, Chapel Hill, NC (United States)]·Limbu, Yogendra [Univ. of Iowa, Iowa City, IA (United States)]·Puel, Tharnier O. [Univ. of Iowa, Iowa City, IA (United States)]·Shi, Yueguang [Univ. of Iowa, Iowa City, IA (United States)]·Markham, Matthew L. [Element Six (United Kingdom]·Patel, Rajesh L. [Element Six (United Kingdom)]·Gumann, Patryk [IBM, Yorktown Heights, NY (United States). Thomas J. Watson Research Center]·Flatté, Michael E. [Univ. of Iowa, Iowa City, IA (United States)]·Van de Walle, Chris G. [Univ. of California, Santa Barbara, CA (United States)] (ORCID:0000000242125990)·Lyon, Stephen A. [Princeton Univ., NJ (United States)]·de Leon, Nathalie P. [Princeton Univ., NJ (United States)]
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Abstract

Spin defects in diamond are promising platforms for quantum sensing. The longest electron spin relaxation times (T1) at room temperature for solid-state defects are observed in nitrogen vacancy centers in diamond, which can reach 6.67 ms [1], and substitutional nitrogen (“P1 centers”) in diamond, which exhibit a T1 of 2 ms [2]. No other solid-state defect has exhibited millisecond-scale spin relaxation times at room temperature thus far. Here, we characterize the spin properties of the WAR5 defect in diamond [3] with pulsed electron spin resonance. The observed T1 is one of the longest for solid-state spin defects: 0.97(27) ms at room temperature and 14.38(19) min at 4 K. The observed coherence time (T2) is 246(7) µs, which can be extended to 6.49(34) ms at 4 K with dynamical decoupling. Finally, we demonstrate optical spin polarization with a range of wavelengths from 405 nm to 500 nm and propose potential zero-phonon line candidates.

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36 MATERIALS SCIENCEdiamondquantum defectsquantum sensingspin qubits

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Mukherjee, Sounak [Princeton Univ., NJ (United States)], Li, Anran [Princeton Univ., NJ (United States)], Eberle, Johannes [Princeton Univ., NJ (United States)], Karg, Sean [Princeton Univ., NJ (United States)], Zhang, Zi-Huai [Princeton Univ., NJ (United States)], Feldman, Mayer M. [Princeton Univ., NJ (United States)], Chen, Yilin [Univ. of California, Santa Barbara, CA (United States)], Turiansky, Mark E. [Univ. of California, Santa Barbara, CA (United States); Naval Research Lab. (NRL), Washington, DC (United States)] (ORCID:0000000291543582), Wang, Mengen [Univ. of California, Santa Barbara, CA (United States); University of North Carolina, Chapel Hill, NC (United States)], Limbu, Yogendra [Univ. of Iowa, Iowa City, IA (United States)], Puel, Tharnier O. [Univ. of Iowa, Iowa City, IA (United States)], Shi, Yueguang [Univ. of Iowa, Iowa City, IA (United States)], Markham, Matthew L. [Element Six (United Kingdom], Patel, Rajesh L. [Element Six (United Kingdom)], Gumann, Patryk [IBM, Yorktown Heights, NY (United States). Thomas J. Watson Research Center], Flatté, Michael E. [Univ. of Iowa, Iowa City, IA (United States)], Van de Walle, Chris G. [Univ. of California, Santa Barbara, CA (United States)] (ORCID:0000000242125990), Lyon, Stephen A. [Princeton Univ., NJ (United States)], de Leon, Nathalie P. [Princeton Univ., NJ (United States)]. 2026-06-15. Defect in diamond with millisecond-scale spin relaxation time at room temperature. https://doi.org/10.1103/3dcd-mkcq

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36 MATERIALS SCIENCE↗